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From kgyrtk...@apache.org
Subject [18/54] [partial] hive git commit: HIVE-17550: Remove unreferenced q.out-s (Zoltan Haindrich, reviewed by Ashutosh Chauhan)
Date Thu, 21 Sep 2017 09:06:55 GMT
http://git-wip-us.apache.org/repos/asf/hive/blob/6f5c1135/ql/src/test/results/clientpositive/correlationoptimizer4.q.out
----------------------------------------------------------------------
diff --git a/ql/src/test/results/clientpositive/correlationoptimizer4.q.out b/ql/src/test/results/clientpositive/correlationoptimizer4.q.out
deleted file mode 100644
index 8596827..0000000
--- a/ql/src/test/results/clientpositive/correlationoptimizer4.q.out
+++ /dev/null
@@ -1,1862 +0,0 @@
-PREHOOK: query: CREATE TABLE T1(key INT, val STRING)
-PREHOOK: type: CREATETABLE
-PREHOOK: Output: database:default
-PREHOOK: Output: default@T1
-POSTHOOK: query: CREATE TABLE T1(key INT, val STRING)
-POSTHOOK: type: CREATETABLE
-POSTHOOK: Output: database:default
-POSTHOOK: Output: default@T1
-PREHOOK: query: LOAD DATA LOCAL INPATH '../../data/files/T1.txt' INTO TABLE T1
-PREHOOK: type: LOAD
-#### A masked pattern was here ####
-PREHOOK: Output: default@t1
-POSTHOOK: query: LOAD DATA LOCAL INPATH '../../data/files/T1.txt' INTO TABLE T1
-POSTHOOK: type: LOAD
-#### A masked pattern was here ####
-POSTHOOK: Output: default@t1
-PREHOOK: query: CREATE TABLE T2(key INT, val STRING)
-PREHOOK: type: CREATETABLE
-PREHOOK: Output: database:default
-PREHOOK: Output: default@T2
-POSTHOOK: query: CREATE TABLE T2(key INT, val STRING)
-POSTHOOK: type: CREATETABLE
-POSTHOOK: Output: database:default
-POSTHOOK: Output: default@T2
-PREHOOK: query: LOAD DATA LOCAL INPATH '../../data/files/T2.txt' INTO TABLE T2
-PREHOOK: type: LOAD
-#### A masked pattern was here ####
-PREHOOK: Output: default@t2
-POSTHOOK: query: LOAD DATA LOCAL INPATH '../../data/files/T2.txt' INTO TABLE T2
-POSTHOOK: type: LOAD
-#### A masked pattern was here ####
-POSTHOOK: Output: default@t2
-PREHOOK: query: CREATE TABLE T3(key INT, val STRING)
-PREHOOK: type: CREATETABLE
-PREHOOK: Output: database:default
-PREHOOK: Output: default@T3
-POSTHOOK: query: CREATE TABLE T3(key INT, val STRING)
-POSTHOOK: type: CREATETABLE
-POSTHOOK: Output: database:default
-POSTHOOK: Output: default@T3
-PREHOOK: query: LOAD DATA LOCAL INPATH '../../data/files/T1.txt' INTO TABLE T3
-PREHOOK: type: LOAD
-#### A masked pattern was here ####
-PREHOOK: Output: default@t3
-POSTHOOK: query: LOAD DATA LOCAL INPATH '../../data/files/T1.txt' INTO TABLE T3
-POSTHOOK: type: LOAD
-#### A masked pattern was here ####
-POSTHOOK: Output: default@t3
-PREHOOK: query: -- When Correlation Optimizer is turned off, this query will be evaluated
--- by 3 MR jobs. 
--- When Correlation Optimizer is turned on, this query will be evaluated by
--- 2 MR jobs. The subquery tmp will be evaluated in a single MR job.
-EXPLAIN
-SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x JOIN T1 y ON (x.key = y.key) JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-PREHOOK: type: QUERY
-POSTHOOK: query: -- When Correlation Optimizer is turned off, this query will be evaluated
--- by 3 MR jobs. 
--- When Correlation Optimizer is turned on, this query will be evaluated by
--- 2 MR jobs. The subquery tmp will be evaluated in a single MR job.
-EXPLAIN
-SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x JOIN T1 y ON (x.key = y.key) JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-POSTHOOK: type: QUERY
-STAGE DEPENDENCIES:
-  Stage-1 is a root stage
-  Stage-2 depends on stages: Stage-1
-  Stage-3 depends on stages: Stage-2
-  Stage-0 depends on stages: Stage-3
-
-STAGE PLANS:
-  Stage: Stage-1
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            alias: x
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Filter Operator
-              predicate: key is not null (type: boolean)
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Select Operator
-                expressions: key (type: int)
-                outputColumnNames: _col0
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-                Reduce Output Operator
-                  key expressions: _col0 (type: int)
-                  sort order: +
-                  Map-reduce partition columns: _col0 (type: int)
-                  Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          TableScan
-            alias: y
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Filter Operator
-              predicate: key is not null (type: boolean)
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Select Operator
-                expressions: key (type: int)
-                outputColumnNames: _col0
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-                Reduce Output Operator
-                  key expressions: _col0 (type: int)
-                  sort order: +
-                  Map-reduce partition columns: _col0 (type: int)
-                  Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          TableScan
-            alias: z
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Filter Operator
-              predicate: key is not null (type: boolean)
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Select Operator
-                expressions: key (type: int)
-                outputColumnNames: _col0
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-                Reduce Output Operator
-                  key expressions: _col0 (type: int)
-                  sort order: +
-                  Map-reduce partition columns: _col0 (type: int)
-                  Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-      Reduce Operator Tree:
-        Join Operator
-          condition map:
-               Inner Join 0 to 1
-               Inner Join 1 to 2
-          keys:
-            0 _col0 (type: int)
-            1 _col0 (type: int)
-            2 _col0 (type: int)
-          outputColumnNames: _col1
-          Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-          Select Operator
-            expressions: _col1 (type: int)
-            outputColumnNames: _col0
-            Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-            Group By Operator
-              aggregations: count(1)
-              keys: _col0 (type: int)
-              mode: hash
-              outputColumnNames: _col0, _col1
-              Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-              File Output Operator
-                compressed: false
-                table:
-                    input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                    output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                    serde: org.apache.hadoop.hive.serde2.lazybinary.LazyBinarySerDe
-
-  Stage: Stage-2
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            Reduce Output Operator
-              key expressions: _col0 (type: int)
-              sort order: +
-              Map-reduce partition columns: _col0 (type: int)
-              Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-              value expressions: _col1 (type: bigint)
-      Reduce Operator Tree:
-        Group By Operator
-          aggregations: count(VALUE._col0)
-          keys: KEY._col0 (type: int)
-          mode: mergepartial
-          outputColumnNames: _col0, _col1
-          Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          Select Operator
-            expressions: hash(_col0) (type: int), hash(_col1) (type: int)
-            outputColumnNames: _col0, _col1
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Group By Operator
-              aggregations: sum(_col0), sum(_col1)
-              mode: hash
-              outputColumnNames: _col0, _col1
-              Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-              File Output Operator
-                compressed: false
-                table:
-                    input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                    output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                    serde: org.apache.hadoop.hive.serde2.lazybinary.LazyBinarySerDe
-
-  Stage: Stage-3
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            Reduce Output Operator
-              sort order: 
-              Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-              value expressions: _col0 (type: bigint), _col1 (type: bigint)
-      Reduce Operator Tree:
-        Group By Operator
-          aggregations: sum(VALUE._col0), sum(VALUE._col1)
-          mode: mergepartial
-          outputColumnNames: _col0, _col1
-          Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-          File Output Operator
-            compressed: false
-            Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-            table:
-                input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
-
-  Stage: Stage-0
-    Fetch Operator
-      limit: -1
-      Processor Tree:
-        ListSink
-
-PREHOOK: query: SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x JOIN T1 y ON (x.key = y.key) JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-PREHOOK: type: QUERY
-PREHOOK: Input: default@t1
-PREHOOK: Input: default@t2
-PREHOOK: Input: default@t3
-#### A masked pattern was here ####
-POSTHOOK: query: SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x JOIN T1 y ON (x.key = y.key) JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-POSTHOOK: type: QUERY
-POSTHOOK: Input: default@t1
-POSTHOOK: Input: default@t2
-POSTHOOK: Input: default@t3
-#### A masked pattern was here ####
-13	10
-PREHOOK: query: EXPLAIN
-SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x JOIN T1 y ON (x.key = y.key) JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-PREHOOK: type: QUERY
-POSTHOOK: query: EXPLAIN
-SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x JOIN T1 y ON (x.key = y.key) JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-POSTHOOK: type: QUERY
-STAGE DEPENDENCIES:
-  Stage-1 is a root stage
-  Stage-2 depends on stages: Stage-1
-  Stage-0 depends on stages: Stage-2
-
-STAGE PLANS:
-  Stage: Stage-1
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            alias: x
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Filter Operator
-              predicate: key is not null (type: boolean)
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Select Operator
-                expressions: key (type: int)
-                outputColumnNames: _col0
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-                Reduce Output Operator
-                  key expressions: _col0 (type: int)
-                  sort order: +
-                  Map-reduce partition columns: _col0 (type: int)
-                  Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          TableScan
-            alias: y
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Filter Operator
-              predicate: key is not null (type: boolean)
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Select Operator
-                expressions: key (type: int)
-                outputColumnNames: _col0
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-                Reduce Output Operator
-                  key expressions: _col0 (type: int)
-                  sort order: +
-                  Map-reduce partition columns: _col0 (type: int)
-                  Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          TableScan
-            alias: z
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Filter Operator
-              predicate: key is not null (type: boolean)
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Select Operator
-                expressions: key (type: int)
-                outputColumnNames: _col0
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-                Reduce Output Operator
-                  key expressions: _col0 (type: int)
-                  sort order: +
-                  Map-reduce partition columns: _col0 (type: int)
-                  Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-      Reduce Operator Tree:
-        Demux Operator
-          Statistics: Num rows: 21 Data size: 90 Basic stats: COMPLETE Column stats: NONE
-          Join Operator
-            condition map:
-                 Inner Join 0 to 1
-                 Inner Join 1 to 2
-            keys:
-              0 _col0 (type: int)
-              1 _col0 (type: int)
-              2 _col0 (type: int)
-            outputColumnNames: _col1
-            Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE
-            Select Operator
-              expressions: _col1 (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE
-              Mux Operator
-                Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE
-                Group By Operator
-                  aggregations: count(1)
-                  keys: _col0 (type: int)
-                  mode: complete
-                  outputColumnNames: _col0, _col1
-                  Statistics: Num rows: 1 Data size: 0 Basic stats: PARTIAL Column stats: NONE
-                  Select Operator
-                    expressions: hash(_col0) (type: int), hash(_col1) (type: int)
-                    outputColumnNames: _col0, _col1
-                    Statistics: Num rows: 1 Data size: 0 Basic stats: PARTIAL Column stats: NONE
-                    Group By Operator
-                      aggregations: sum(_col0), sum(_col1)
-                      mode: hash
-                      outputColumnNames: _col0, _col1
-                      Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-                      File Output Operator
-                        compressed: false
-                        table:
-                            input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                            output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                            serde: org.apache.hadoop.hive.serde2.lazybinary.LazyBinarySerDe
-
-  Stage: Stage-2
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            Reduce Output Operator
-              sort order: 
-              Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-              value expressions: _col0 (type: bigint), _col1 (type: bigint)
-      Reduce Operator Tree:
-        Group By Operator
-          aggregations: sum(VALUE._col0), sum(VALUE._col1)
-          mode: mergepartial
-          outputColumnNames: _col0, _col1
-          Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-          File Output Operator
-            compressed: false
-            Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-            table:
-                input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
-
-  Stage: Stage-0
-    Fetch Operator
-      limit: -1
-      Processor Tree:
-        ListSink
-
-PREHOOK: query: SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x JOIN T1 y ON (x.key = y.key) JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-PREHOOK: type: QUERY
-PREHOOK: Input: default@t1
-PREHOOK: Input: default@t2
-PREHOOK: Input: default@t3
-#### A masked pattern was here ####
-POSTHOOK: query: SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x JOIN T1 y ON (x.key = y.key) JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-POSTHOOK: type: QUERY
-POSTHOOK: Input: default@t1
-POSTHOOK: Input: default@t2
-POSTHOOK: Input: default@t3
-#### A masked pattern was here ####
-13	10
-PREHOOK: query: -- Enable hive.auto.convert.join.
-EXPLAIN
-SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x JOIN T1 y ON (x.key = y.key) JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-PREHOOK: type: QUERY
-POSTHOOK: query: -- Enable hive.auto.convert.join.
-EXPLAIN
-SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x JOIN T1 y ON (x.key = y.key) JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-POSTHOOK: type: QUERY
-STAGE DEPENDENCIES:
-  Stage-7 is a root stage
-  Stage-2 depends on stages: Stage-7
-  Stage-3 depends on stages: Stage-2
-  Stage-0 depends on stages: Stage-3
-
-STAGE PLANS:
-  Stage: Stage-7
-    Map Reduce Local Work
-      Alias -> Map Local Tables:
-        $hdt$_0:$hdt$_0:$hdt$_0:x 
-          Fetch Operator
-            limit: -1
-        $hdt$_0:$hdt$_0:$hdt$_1:y 
-          Fetch Operator
-            limit: -1
-      Alias -> Map Local Operator Tree:
-        $hdt$_0:$hdt$_0:$hdt$_0:x 
-          TableScan
-            alias: x
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Filter Operator
-              predicate: key is not null (type: boolean)
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Select Operator
-                expressions: key (type: int)
-                outputColumnNames: _col0
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-                HashTable Sink Operator
-                  keys:
-                    0 _col0 (type: int)
-                    1 _col0 (type: int)
-                    2 _col0 (type: int)
-        $hdt$_0:$hdt$_0:$hdt$_1:y 
-          TableScan
-            alias: y
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Filter Operator
-              predicate: key is not null (type: boolean)
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Select Operator
-                expressions: key (type: int)
-                outputColumnNames: _col0
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-                HashTable Sink Operator
-                  keys:
-                    0 _col0 (type: int)
-                    1 _col0 (type: int)
-                    2 _col0 (type: int)
-
-  Stage: Stage-2
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            alias: z
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Filter Operator
-              predicate: key is not null (type: boolean)
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Select Operator
-                expressions: key (type: int)
-                outputColumnNames: _col0
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-                Map Join Operator
-                  condition map:
-                       Inner Join 0 to 1
-                       Inner Join 1 to 2
-                  keys:
-                    0 _col0 (type: int)
-                    1 _col0 (type: int)
-                    2 _col0 (type: int)
-                  outputColumnNames: _col1
-                  Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-                  Select Operator
-                    expressions: _col1 (type: int)
-                    outputColumnNames: _col0
-                    Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-                    Group By Operator
-                      aggregations: count(1)
-                      keys: _col0 (type: int)
-                      mode: hash
-                      outputColumnNames: _col0, _col1
-                      Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-                      Reduce Output Operator
-                        key expressions: _col0 (type: int)
-                        sort order: +
-                        Map-reduce partition columns: _col0 (type: int)
-                        Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-                        value expressions: _col1 (type: bigint)
-      Local Work:
-        Map Reduce Local Work
-      Reduce Operator Tree:
-        Group By Operator
-          aggregations: count(VALUE._col0)
-          keys: KEY._col0 (type: int)
-          mode: mergepartial
-          outputColumnNames: _col0, _col1
-          Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          Select Operator
-            expressions: hash(_col0) (type: int), hash(_col1) (type: int)
-            outputColumnNames: _col0, _col1
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Group By Operator
-              aggregations: sum(_col0), sum(_col1)
-              mode: hash
-              outputColumnNames: _col0, _col1
-              Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-              File Output Operator
-                compressed: false
-                table:
-                    input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                    output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                    serde: org.apache.hadoop.hive.serde2.lazybinary.LazyBinarySerDe
-
-  Stage: Stage-3
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            Reduce Output Operator
-              sort order: 
-              Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-              value expressions: _col0 (type: bigint), _col1 (type: bigint)
-      Reduce Operator Tree:
-        Group By Operator
-          aggregations: sum(VALUE._col0), sum(VALUE._col1)
-          mode: mergepartial
-          outputColumnNames: _col0, _col1
-          Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-          File Output Operator
-            compressed: false
-            Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-            table:
-                input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
-
-  Stage: Stage-0
-    Fetch Operator
-      limit: -1
-      Processor Tree:
-        ListSink
-
-PREHOOK: query: SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x JOIN T1 y ON (x.key = y.key) JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-PREHOOK: type: QUERY
-PREHOOK: Input: default@t1
-PREHOOK: Input: default@t2
-PREHOOK: Input: default@t3
-#### A masked pattern was here ####
-POSTHOOK: query: SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x JOIN T1 y ON (x.key = y.key) JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-POSTHOOK: type: QUERY
-POSTHOOK: Input: default@t1
-POSTHOOK: Input: default@t2
-POSTHOOK: Input: default@t3
-#### A masked pattern was here ####
-13	10
-PREHOOK: query: -- This case should be optimized, since the key of GroupByOperator is from the leftmost table
--- of a chain of LEFT OUTER JOINs.
-EXPLAIN
-SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT x.key AS key, count(1) AS cnt
-      FROM T2 x LEFT OUTER JOIN T1 y ON (x.key = y.key) LEFT OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY x.key) tmp
-PREHOOK: type: QUERY
-POSTHOOK: query: -- This case should be optimized, since the key of GroupByOperator is from the leftmost table
--- of a chain of LEFT OUTER JOINs.
-EXPLAIN
-SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT x.key AS key, count(1) AS cnt
-      FROM T2 x LEFT OUTER JOIN T1 y ON (x.key = y.key) LEFT OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY x.key) tmp
-POSTHOOK: type: QUERY
-STAGE DEPENDENCIES:
-  Stage-1 is a root stage
-  Stage-2 depends on stages: Stage-1
-  Stage-3 depends on stages: Stage-2
-  Stage-0 depends on stages: Stage-3
-
-STAGE PLANS:
-  Stage: Stage-1
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            alias: x
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Select Operator
-              expressions: key (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Reduce Output Operator
-                key expressions: _col0 (type: int)
-                sort order: +
-                Map-reduce partition columns: _col0 (type: int)
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          TableScan
-            alias: y
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Select Operator
-              expressions: key (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Reduce Output Operator
-                key expressions: _col0 (type: int)
-                sort order: +
-                Map-reduce partition columns: _col0 (type: int)
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          TableScan
-            alias: z
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Select Operator
-              expressions: key (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Reduce Output Operator
-                key expressions: _col0 (type: int)
-                sort order: +
-                Map-reduce partition columns: _col0 (type: int)
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-      Reduce Operator Tree:
-        Join Operator
-          condition map:
-               Left Outer Join0 to 1
-               Left Outer Join1 to 2
-          keys:
-            0 _col0 (type: int)
-            1 _col0 (type: int)
-            2 _col0 (type: int)
-          outputColumnNames: _col0
-          Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-          Group By Operator
-            aggregations: count(1)
-            keys: _col0 (type: int)
-            mode: hash
-            outputColumnNames: _col0, _col1
-            Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-            File Output Operator
-              compressed: false
-              table:
-                  input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                  output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                  serde: org.apache.hadoop.hive.serde2.lazybinary.LazyBinarySerDe
-
-  Stage: Stage-2
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            Reduce Output Operator
-              key expressions: _col0 (type: int)
-              sort order: +
-              Map-reduce partition columns: _col0 (type: int)
-              Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-              value expressions: _col1 (type: bigint)
-      Reduce Operator Tree:
-        Group By Operator
-          aggregations: count(VALUE._col0)
-          keys: KEY._col0 (type: int)
-          mode: mergepartial
-          outputColumnNames: _col0, _col1
-          Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          Select Operator
-            expressions: hash(_col0) (type: int), hash(_col1) (type: int)
-            outputColumnNames: _col0, _col1
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Group By Operator
-              aggregations: sum(_col0), sum(_col1)
-              mode: hash
-              outputColumnNames: _col0, _col1
-              Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-              File Output Operator
-                compressed: false
-                table:
-                    input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                    output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                    serde: org.apache.hadoop.hive.serde2.lazybinary.LazyBinarySerDe
-
-  Stage: Stage-3
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            Reduce Output Operator
-              sort order: 
-              Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-              value expressions: _col0 (type: bigint), _col1 (type: bigint)
-      Reduce Operator Tree:
-        Group By Operator
-          aggregations: sum(VALUE._col0), sum(VALUE._col1)
-          mode: mergepartial
-          outputColumnNames: _col0, _col1
-          Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-          File Output Operator
-            compressed: false
-            Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-            table:
-                input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
-
-  Stage: Stage-0
-    Fetch Operator
-      limit: -1
-      Processor Tree:
-        ListSink
-
-PREHOOK: query: SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT x.key AS key, count(1) AS cnt
-      FROM T2 x LEFT OUTER JOIN T1 y ON (x.key = y.key) LEFT OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY x.key) tmp
-PREHOOK: type: QUERY
-PREHOOK: Input: default@t1
-PREHOOK: Input: default@t2
-PREHOOK: Input: default@t3
-#### A masked pattern was here ####
-POSTHOOK: query: SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT x.key AS key, count(1) AS cnt
-      FROM T2 x LEFT OUTER JOIN T1 y ON (x.key = y.key) LEFT OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY x.key) tmp
-POSTHOOK: type: QUERY
-POSTHOOK: Input: default@t1
-POSTHOOK: Input: default@t2
-POSTHOOK: Input: default@t3
-#### A masked pattern was here ####
-22	12
-PREHOOK: query: EXPLAIN
-SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT x.key AS key, count(1) AS cnt
-      FROM T2 x LEFT OUTER JOIN T1 y ON (x.key = y.key) LEFT OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY x.key) tmp
-PREHOOK: type: QUERY
-POSTHOOK: query: EXPLAIN
-SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT x.key AS key, count(1) AS cnt
-      FROM T2 x LEFT OUTER JOIN T1 y ON (x.key = y.key) LEFT OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY x.key) tmp
-POSTHOOK: type: QUERY
-STAGE DEPENDENCIES:
-  Stage-1 is a root stage
-  Stage-2 depends on stages: Stage-1
-  Stage-0 depends on stages: Stage-2
-
-STAGE PLANS:
-  Stage: Stage-1
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            alias: x
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Select Operator
-              expressions: key (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Reduce Output Operator
-                key expressions: _col0 (type: int)
-                sort order: +
-                Map-reduce partition columns: _col0 (type: int)
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          TableScan
-            alias: y
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Select Operator
-              expressions: key (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Reduce Output Operator
-                key expressions: _col0 (type: int)
-                sort order: +
-                Map-reduce partition columns: _col0 (type: int)
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          TableScan
-            alias: z
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Select Operator
-              expressions: key (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Reduce Output Operator
-                key expressions: _col0 (type: int)
-                sort order: +
-                Map-reduce partition columns: _col0 (type: int)
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-      Reduce Operator Tree:
-        Demux Operator
-          Statistics: Num rows: 21 Data size: 90 Basic stats: COMPLETE Column stats: NONE
-          Join Operator
-            condition map:
-                 Left Outer Join0 to 1
-                 Left Outer Join1 to 2
-            keys:
-              0 _col0 (type: int)
-              1 _col0 (type: int)
-              2 _col0 (type: int)
-            outputColumnNames: _col0
-            Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE
-            Mux Operator
-              Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE
-              Group By Operator
-                aggregations: count(1)
-                keys: _col0 (type: int)
-                mode: complete
-                outputColumnNames: _col0, _col1
-                Statistics: Num rows: 1 Data size: 0 Basic stats: PARTIAL Column stats: NONE
-                Select Operator
-                  expressions: hash(_col0) (type: int), hash(_col1) (type: int)
-                  outputColumnNames: _col0, _col1
-                  Statistics: Num rows: 1 Data size: 0 Basic stats: PARTIAL Column stats: NONE
-                  Group By Operator
-                    aggregations: sum(_col0), sum(_col1)
-                    mode: hash
-                    outputColumnNames: _col0, _col1
-                    Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-                    File Output Operator
-                      compressed: false
-                      table:
-                          input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                          output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                          serde: org.apache.hadoop.hive.serde2.lazybinary.LazyBinarySerDe
-
-  Stage: Stage-2
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            Reduce Output Operator
-              sort order: 
-              Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-              value expressions: _col0 (type: bigint), _col1 (type: bigint)
-      Reduce Operator Tree:
-        Group By Operator
-          aggregations: sum(VALUE._col0), sum(VALUE._col1)
-          mode: mergepartial
-          outputColumnNames: _col0, _col1
-          Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-          File Output Operator
-            compressed: false
-            Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-            table:
-                input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
-
-  Stage: Stage-0
-    Fetch Operator
-      limit: -1
-      Processor Tree:
-        ListSink
-
-PREHOOK: query: SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT x.key AS key, count(1) AS cnt
-      FROM T2 x LEFT OUTER JOIN T1 y ON (x.key = y.key) LEFT OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY x.key) tmp
-PREHOOK: type: QUERY
-PREHOOK: Input: default@t1
-PREHOOK: Input: default@t2
-PREHOOK: Input: default@t3
-#### A masked pattern was here ####
-POSTHOOK: query: SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT x.key AS key, count(1) AS cnt
-      FROM T2 x LEFT OUTER JOIN T1 y ON (x.key = y.key) LEFT OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY x.key) tmp
-POSTHOOK: type: QUERY
-POSTHOOK: Input: default@t1
-POSTHOOK: Input: default@t2
-POSTHOOK: Input: default@t3
-#### A masked pattern was here ####
-22	12
-PREHOOK: query: -- This query will not be optimized by correlation optimizer because
--- GroupByOperator uses y.key (a right table of a left outer join)
--- as the key.
-EXPLAIN
-SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x LEFT OUTER JOIN T1 y ON (x.key = y.key) LEFT OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-PREHOOK: type: QUERY
-POSTHOOK: query: -- This query will not be optimized by correlation optimizer because
--- GroupByOperator uses y.key (a right table of a left outer join)
--- as the key.
-EXPLAIN
-SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x LEFT OUTER JOIN T1 y ON (x.key = y.key) LEFT OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-POSTHOOK: type: QUERY
-STAGE DEPENDENCIES:
-  Stage-1 is a root stage
-  Stage-2 depends on stages: Stage-1
-  Stage-3 depends on stages: Stage-2
-  Stage-0 depends on stages: Stage-3
-
-STAGE PLANS:
-  Stage: Stage-1
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            alias: x
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Select Operator
-              expressions: key (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Reduce Output Operator
-                key expressions: _col0 (type: int)
-                sort order: +
-                Map-reduce partition columns: _col0 (type: int)
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          TableScan
-            alias: y
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Select Operator
-              expressions: key (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Reduce Output Operator
-                key expressions: _col0 (type: int)
-                sort order: +
-                Map-reduce partition columns: _col0 (type: int)
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          TableScan
-            alias: z
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Select Operator
-              expressions: key (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Reduce Output Operator
-                key expressions: _col0 (type: int)
-                sort order: +
-                Map-reduce partition columns: _col0 (type: int)
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-      Reduce Operator Tree:
-        Join Operator
-          condition map:
-               Left Outer Join0 to 1
-               Left Outer Join1 to 2
-          keys:
-            0 _col0 (type: int)
-            1 _col0 (type: int)
-            2 _col0 (type: int)
-          outputColumnNames: _col1
-          Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-          Select Operator
-            expressions: _col1 (type: int)
-            outputColumnNames: _col0
-            Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-            Group By Operator
-              aggregations: count(1)
-              keys: _col0 (type: int)
-              mode: hash
-              outputColumnNames: _col0, _col1
-              Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-              File Output Operator
-                compressed: false
-                table:
-                    input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                    output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                    serde: org.apache.hadoop.hive.serde2.lazybinary.LazyBinarySerDe
-
-  Stage: Stage-2
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            Reduce Output Operator
-              key expressions: _col0 (type: int)
-              sort order: +
-              Map-reduce partition columns: _col0 (type: int)
-              Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-              value expressions: _col1 (type: bigint)
-      Reduce Operator Tree:
-        Group By Operator
-          aggregations: count(VALUE._col0)
-          keys: KEY._col0 (type: int)
-          mode: mergepartial
-          outputColumnNames: _col0, _col1
-          Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          Select Operator
-            expressions: hash(_col0) (type: int), hash(_col1) (type: int)
-            outputColumnNames: _col0, _col1
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Group By Operator
-              aggregations: sum(_col0), sum(_col1)
-              mode: hash
-              outputColumnNames: _col0, _col1
-              Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-              File Output Operator
-                compressed: false
-                table:
-                    input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                    output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                    serde: org.apache.hadoop.hive.serde2.lazybinary.LazyBinarySerDe
-
-  Stage: Stage-3
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            Reduce Output Operator
-              sort order: 
-              Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-              value expressions: _col0 (type: bigint), _col1 (type: bigint)
-      Reduce Operator Tree:
-        Group By Operator
-          aggregations: sum(VALUE._col0), sum(VALUE._col1)
-          mode: mergepartial
-          outputColumnNames: _col0, _col1
-          Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-          File Output Operator
-            compressed: false
-            Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-            table:
-                input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
-
-  Stage: Stage-0
-    Fetch Operator
-      limit: -1
-      Processor Tree:
-        ListSink
-
-PREHOOK: query: SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x LEFT OUTER JOIN T1 y ON (x.key = y.key) LEFT OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-PREHOOK: type: QUERY
-PREHOOK: Input: default@t1
-PREHOOK: Input: default@t2
-PREHOOK: Input: default@t3
-#### A masked pattern was here ####
-POSTHOOK: query: SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x LEFT OUTER JOIN T1 y ON (x.key = y.key) LEFT OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-POSTHOOK: type: QUERY
-POSTHOOK: Input: default@t1
-POSTHOOK: Input: default@t2
-POSTHOOK: Input: default@t3
-#### A masked pattern was here ####
-13	12
-PREHOOK: query: -- This case should be optimized, since the key of GroupByOperator is from the rightmost table
--- of a chain of RIGHT OUTER JOINs.
-EXPLAIN
-SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT z.key AS key, count(1) AS cnt
-      FROM T2 x RIGHT OUTER JOIN T1 y ON (x.key = y.key) RIGHT OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY z.key) tmp
-PREHOOK: type: QUERY
-POSTHOOK: query: -- This case should be optimized, since the key of GroupByOperator is from the rightmost table
--- of a chain of RIGHT OUTER JOINs.
-EXPLAIN
-SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT z.key AS key, count(1) AS cnt
-      FROM T2 x RIGHT OUTER JOIN T1 y ON (x.key = y.key) RIGHT OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY z.key) tmp
-POSTHOOK: type: QUERY
-STAGE DEPENDENCIES:
-  Stage-1 is a root stage
-  Stage-2 depends on stages: Stage-1
-  Stage-3 depends on stages: Stage-2
-  Stage-0 depends on stages: Stage-3
-
-STAGE PLANS:
-  Stage: Stage-1
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            alias: x
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Select Operator
-              expressions: key (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Reduce Output Operator
-                key expressions: _col0 (type: int)
-                sort order: +
-                Map-reduce partition columns: _col0 (type: int)
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          TableScan
-            alias: y
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Select Operator
-              expressions: key (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Reduce Output Operator
-                key expressions: _col0 (type: int)
-                sort order: +
-                Map-reduce partition columns: _col0 (type: int)
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          TableScan
-            alias: z
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Select Operator
-              expressions: key (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Reduce Output Operator
-                key expressions: _col0 (type: int)
-                sort order: +
-                Map-reduce partition columns: _col0 (type: int)
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-      Reduce Operator Tree:
-        Join Operator
-          condition map:
-               Right Outer Join0 to 1
-               Right Outer Join1 to 2
-          keys:
-            0 _col0 (type: int)
-            1 _col0 (type: int)
-            2 _col0 (type: int)
-          outputColumnNames: _col2
-          Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-          Select Operator
-            expressions: _col2 (type: int)
-            outputColumnNames: _col0
-            Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-            Group By Operator
-              aggregations: count(1)
-              keys: _col0 (type: int)
-              mode: hash
-              outputColumnNames: _col0, _col1
-              Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-              File Output Operator
-                compressed: false
-                table:
-                    input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                    output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                    serde: org.apache.hadoop.hive.serde2.lazybinary.LazyBinarySerDe
-
-  Stage: Stage-2
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            Reduce Output Operator
-              key expressions: _col0 (type: int)
-              sort order: +
-              Map-reduce partition columns: _col0 (type: int)
-              Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-              value expressions: _col1 (type: bigint)
-      Reduce Operator Tree:
-        Group By Operator
-          aggregations: count(VALUE._col0)
-          keys: KEY._col0 (type: int)
-          mode: mergepartial
-          outputColumnNames: _col0, _col1
-          Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          Select Operator
-            expressions: hash(_col0) (type: int), hash(_col1) (type: int)
-            outputColumnNames: _col0, _col1
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Group By Operator
-              aggregations: sum(_col0), sum(_col1)
-              mode: hash
-              outputColumnNames: _col0, _col1
-              Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-              File Output Operator
-                compressed: false
-                table:
-                    input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                    output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                    serde: org.apache.hadoop.hive.serde2.lazybinary.LazyBinarySerDe
-
-  Stage: Stage-3
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            Reduce Output Operator
-              sort order: 
-              Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-              value expressions: _col0 (type: bigint), _col1 (type: bigint)
-      Reduce Operator Tree:
-        Group By Operator
-          aggregations: sum(VALUE._col0), sum(VALUE._col1)
-          mode: mergepartial
-          outputColumnNames: _col0, _col1
-          Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-          File Output Operator
-            compressed: false
-            Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-            table:
-                input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
-
-  Stage: Stage-0
-    Fetch Operator
-      limit: -1
-      Processor Tree:
-        ListSink
-
-PREHOOK: query: SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT z.key AS key, count(1) AS cnt
-      FROM T2 x RIGHT OUTER JOIN T1 y ON (x.key = y.key) RIGHT OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY z.key) tmp
-PREHOOK: type: QUERY
-PREHOOK: Input: default@t1
-PREHOOK: Input: default@t2
-PREHOOK: Input: default@t3
-#### A masked pattern was here ####
-POSTHOOK: query: SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT z.key AS key, count(1) AS cnt
-      FROM T2 x RIGHT OUTER JOIN T1 y ON (x.key = y.key) RIGHT OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY z.key) tmp
-POSTHOOK: type: QUERY
-POSTHOOK: Input: default@t1
-POSTHOOK: Input: default@t2
-POSTHOOK: Input: default@t3
-#### A masked pattern was here ####
-21	12
-PREHOOK: query: EXPLAIN
-SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT z.key AS key, count(1) AS cnt
-      FROM T2 x RIGHT OUTER JOIN T1 y ON (x.key = y.key) RIGHT OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY z.key) tmp
-PREHOOK: type: QUERY
-POSTHOOK: query: EXPLAIN
-SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT z.key AS key, count(1) AS cnt
-      FROM T2 x RIGHT OUTER JOIN T1 y ON (x.key = y.key) RIGHT OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY z.key) tmp
-POSTHOOK: type: QUERY
-STAGE DEPENDENCIES:
-  Stage-1 is a root stage
-  Stage-2 depends on stages: Stage-1
-  Stage-0 depends on stages: Stage-2
-
-STAGE PLANS:
-  Stage: Stage-1
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            alias: x
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Select Operator
-              expressions: key (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Reduce Output Operator
-                key expressions: _col0 (type: int)
-                sort order: +
-                Map-reduce partition columns: _col0 (type: int)
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          TableScan
-            alias: y
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Select Operator
-              expressions: key (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Reduce Output Operator
-                key expressions: _col0 (type: int)
-                sort order: +
-                Map-reduce partition columns: _col0 (type: int)
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          TableScan
-            alias: z
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Select Operator
-              expressions: key (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Reduce Output Operator
-                key expressions: _col0 (type: int)
-                sort order: +
-                Map-reduce partition columns: _col0 (type: int)
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-      Reduce Operator Tree:
-        Demux Operator
-          Statistics: Num rows: 21 Data size: 90 Basic stats: COMPLETE Column stats: NONE
-          Join Operator
-            condition map:
-                 Right Outer Join0 to 1
-                 Right Outer Join1 to 2
-            keys:
-              0 _col0 (type: int)
-              1 _col0 (type: int)
-              2 _col0 (type: int)
-            outputColumnNames: _col2
-            Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE
-            Select Operator
-              expressions: _col2 (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE
-              Mux Operator
-                Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE
-                Group By Operator
-                  aggregations: count(1)
-                  keys: _col0 (type: int)
-                  mode: complete
-                  outputColumnNames: _col0, _col1
-                  Statistics: Num rows: 1 Data size: 0 Basic stats: PARTIAL Column stats: NONE
-                  Select Operator
-                    expressions: hash(_col0) (type: int), hash(_col1) (type: int)
-                    outputColumnNames: _col0, _col1
-                    Statistics: Num rows: 1 Data size: 0 Basic stats: PARTIAL Column stats: NONE
-                    Group By Operator
-                      aggregations: sum(_col0), sum(_col1)
-                      mode: hash
-                      outputColumnNames: _col0, _col1
-                      Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-                      File Output Operator
-                        compressed: false
-                        table:
-                            input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                            output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                            serde: org.apache.hadoop.hive.serde2.lazybinary.LazyBinarySerDe
-
-  Stage: Stage-2
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            Reduce Output Operator
-              sort order: 
-              Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-              value expressions: _col0 (type: bigint), _col1 (type: bigint)
-      Reduce Operator Tree:
-        Group By Operator
-          aggregations: sum(VALUE._col0), sum(VALUE._col1)
-          mode: mergepartial
-          outputColumnNames: _col0, _col1
-          Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-          File Output Operator
-            compressed: false
-            Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-            table:
-                input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
-
-  Stage: Stage-0
-    Fetch Operator
-      limit: -1
-      Processor Tree:
-        ListSink
-
-PREHOOK: query: SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT z.key AS key, count(1) AS cnt
-      FROM T2 x RIGHT OUTER JOIN T1 y ON (x.key = y.key) RIGHT OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY z.key) tmp
-PREHOOK: type: QUERY
-PREHOOK: Input: default@t1
-PREHOOK: Input: default@t2
-PREHOOK: Input: default@t3
-#### A masked pattern was here ####
-POSTHOOK: query: SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT z.key AS key, count(1) AS cnt
-      FROM T2 x RIGHT OUTER JOIN T1 y ON (x.key = y.key) RIGHT OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY z.key) tmp
-POSTHOOK: type: QUERY
-POSTHOOK: Input: default@t1
-POSTHOOK: Input: default@t2
-POSTHOOK: Input: default@t3
-#### A masked pattern was here ####
-21	12
-PREHOOK: query: -- This query will not be optimized by correlation optimizer because
--- GroupByOperator uses y.key (a left table of a right outer join)
--- as the key.
-EXPLAIN
-SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x RIGHT OUTER JOIN T1 y ON (x.key = y.key) RIGHT OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-PREHOOK: type: QUERY
-POSTHOOK: query: -- This query will not be optimized by correlation optimizer because
--- GroupByOperator uses y.key (a left table of a right outer join)
--- as the key.
-EXPLAIN
-SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x RIGHT OUTER JOIN T1 y ON (x.key = y.key) RIGHT OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-POSTHOOK: type: QUERY
-STAGE DEPENDENCIES:
-  Stage-1 is a root stage
-  Stage-2 depends on stages: Stage-1
-  Stage-3 depends on stages: Stage-2
-  Stage-0 depends on stages: Stage-3
-
-STAGE PLANS:
-  Stage: Stage-1
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            alias: x
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Select Operator
-              expressions: key (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Reduce Output Operator
-                key expressions: _col0 (type: int)
-                sort order: +
-                Map-reduce partition columns: _col0 (type: int)
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          TableScan
-            alias: y
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Select Operator
-              expressions: key (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Reduce Output Operator
-                key expressions: _col0 (type: int)
-                sort order: +
-                Map-reduce partition columns: _col0 (type: int)
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          TableScan
-            alias: z
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Select Operator
-              expressions: key (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Reduce Output Operator
-                key expressions: _col0 (type: int)
-                sort order: +
-                Map-reduce partition columns: _col0 (type: int)
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-      Reduce Operator Tree:
-        Join Operator
-          condition map:
-               Right Outer Join0 to 1
-               Right Outer Join1 to 2
-          keys:
-            0 _col0 (type: int)
-            1 _col0 (type: int)
-            2 _col0 (type: int)
-          outputColumnNames: _col1
-          Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-          Select Operator
-            expressions: _col1 (type: int)
-            outputColumnNames: _col0
-            Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-            Group By Operator
-              aggregations: count(1)
-              keys: _col0 (type: int)
-              mode: hash
-              outputColumnNames: _col0, _col1
-              Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-              File Output Operator
-                compressed: false
-                table:
-                    input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                    output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                    serde: org.apache.hadoop.hive.serde2.lazybinary.LazyBinarySerDe
-
-  Stage: Stage-2
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            Reduce Output Operator
-              key expressions: _col0 (type: int)
-              sort order: +
-              Map-reduce partition columns: _col0 (type: int)
-              Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-              value expressions: _col1 (type: bigint)
-      Reduce Operator Tree:
-        Group By Operator
-          aggregations: count(VALUE._col0)
-          keys: KEY._col0 (type: int)
-          mode: mergepartial
-          outputColumnNames: _col0, _col1
-          Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          Select Operator
-            expressions: hash(_col0) (type: int), hash(_col1) (type: int)
-            outputColumnNames: _col0, _col1
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Group By Operator
-              aggregations: sum(_col0), sum(_col1)
-              mode: hash
-              outputColumnNames: _col0, _col1
-              Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-              File Output Operator
-                compressed: false
-                table:
-                    input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                    output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                    serde: org.apache.hadoop.hive.serde2.lazybinary.LazyBinarySerDe
-
-  Stage: Stage-3
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            Reduce Output Operator
-              sort order: 
-              Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-              value expressions: _col0 (type: bigint), _col1 (type: bigint)
-      Reduce Operator Tree:
-        Group By Operator
-          aggregations: sum(VALUE._col0), sum(VALUE._col1)
-          mode: mergepartial
-          outputColumnNames: _col0, _col1
-          Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-          File Output Operator
-            compressed: false
-            Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-            table:
-                input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
-
-  Stage: Stage-0
-    Fetch Operator
-      limit: -1
-      Processor Tree:
-        ListSink
-
-PREHOOK: query: SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x RIGHT OUTER JOIN T1 y ON (x.key = y.key) RIGHT OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-PREHOOK: type: QUERY
-PREHOOK: Input: default@t1
-PREHOOK: Input: default@t2
-PREHOOK: Input: default@t3
-#### A masked pattern was here ####
-POSTHOOK: query: SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x RIGHT OUTER JOIN T1 y ON (x.key = y.key) RIGHT OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-POSTHOOK: type: QUERY
-POSTHOOK: Input: default@t1
-POSTHOOK: Input: default@t2
-POSTHOOK: Input: default@t3
-#### A masked pattern was here ####
-21	12
-PREHOOK: query: -- This case should not be optimized because afer the FULL OUTER JOIN, rows with null keys
--- are not grouped.
-EXPLAIN
-SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x FULL OUTER JOIN T1 y ON (x.key = y.key) FULL OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-PREHOOK: type: QUERY
-POSTHOOK: query: -- This case should not be optimized because afer the FULL OUTER JOIN, rows with null keys
--- are not grouped.
-EXPLAIN
-SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x FULL OUTER JOIN T1 y ON (x.key = y.key) FULL OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-POSTHOOK: type: QUERY
-STAGE DEPENDENCIES:
-  Stage-1 is a root stage
-  Stage-2 depends on stages: Stage-1
-  Stage-3 depends on stages: Stage-2
-  Stage-0 depends on stages: Stage-3
-
-STAGE PLANS:
-  Stage: Stage-1
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            alias: x
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Select Operator
-              expressions: key (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Reduce Output Operator
-                key expressions: _col0 (type: int)
-                sort order: +
-                Map-reduce partition columns: _col0 (type: int)
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          TableScan
-            alias: y
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Select Operator
-              expressions: key (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Reduce Output Operator
-                key expressions: _col0 (type: int)
-                sort order: +
-                Map-reduce partition columns: _col0 (type: int)
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          TableScan
-            alias: z
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Select Operator
-              expressions: key (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Reduce Output Operator
-                key expressions: _col0 (type: int)
-                sort order: +
-                Map-reduce partition columns: _col0 (type: int)
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-      Reduce Operator Tree:
-        Join Operator
-          condition map:
-               Outer Join 0 to 1
-               Outer Join 1 to 2
-          keys:
-            0 _col0 (type: int)
-            1 _col0 (type: int)
-            2 _col0 (type: int)
-          outputColumnNames: _col1
-          Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-          Select Operator
-            expressions: _col1 (type: int)
-            outputColumnNames: _col0
-            Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-            Group By Operator
-              aggregations: count(1)
-              keys: _col0 (type: int)
-              mode: hash
-              outputColumnNames: _col0, _col1
-              Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-              File Output Operator
-                compressed: false
-                table:
-                    input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                    output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                    serde: org.apache.hadoop.hive.serde2.lazybinary.LazyBinarySerDe
-
-  Stage: Stage-2
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            Reduce Output Operator
-              key expressions: _col0 (type: int)
-              sort order: +
-              Map-reduce partition columns: _col0 (type: int)
-              Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-              value expressions: _col1 (type: bigint)
-      Reduce Operator Tree:
-        Group By Operator
-          aggregations: count(VALUE._col0)
-          keys: KEY._col0 (type: int)
-          mode: mergepartial
-          outputColumnNames: _col0, _col1
-          Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          Select Operator
-            expressions: hash(_col0) (type: int), hash(_col1) (type: int)
-            outputColumnNames: _col0, _col1
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Group By Operator
-              aggregations: sum(_col0), sum(_col1)
-              mode: hash
-              outputColumnNames: _col0, _col1
-              Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-              File Output Operator
-                compressed: false
-                table:
-                    input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                    output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                    serde: org.apache.hadoop.hive.serde2.lazybinary.LazyBinarySerDe
-
-  Stage: Stage-3
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            Reduce Output Operator
-              sort order: 
-              Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-              value expressions: _col0 (type: bigint), _col1 (type: bigint)
-      Reduce Operator Tree:
-        Group By Operator
-          aggregations: sum(VALUE._col0), sum(VALUE._col1)
-          mode: mergepartial
-          outputColumnNames: _col0, _col1
-          Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-          File Output Operator
-            compressed: false
-            Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-            table:
-                input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
-
-  Stage: Stage-0
-    Fetch Operator
-      limit: -1
-      Processor Tree:
-        ListSink
-
-PREHOOK: query: SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x FULL OUTER JOIN T1 y ON (x.key = y.key) FULL OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-PREHOOK: type: QUERY
-PREHOOK: Input: default@t1
-PREHOOK: Input: default@t2
-PREHOOK: Input: default@t3
-#### A masked pattern was here ####
-POSTHOOK: query: SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x FULL OUTER JOIN T1 y ON (x.key = y.key) FULL OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-POSTHOOK: type: QUERY
-POSTHOOK: Input: default@t1
-POSTHOOK: Input: default@t2
-POSTHOOK: Input: default@t3
-#### A masked pattern was here ####
-21	14
-PREHOOK: query: EXPLAIN
-SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x FULL OUTER JOIN T1 y ON (x.key = y.key) FULL OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-PREHOOK: type: QUERY
-POSTHOOK: query: EXPLAIN
-SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x FULL OUTER JOIN T1 y ON (x.key = y.key) FULL OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-POSTHOOK: type: QUERY
-STAGE DEPENDENCIES:
-  Stage-1 is a root stage
-  Stage-2 depends on stages: Stage-1
-  Stage-3 depends on stages: Stage-2
-  Stage-0 depends on stages: Stage-3
-
-STAGE PLANS:
-  Stage: Stage-1
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            alias: x
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Select Operator
-              expressions: key (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Reduce Output Operator
-                key expressions: _col0 (type: int)
-                sort order: +
-                Map-reduce partition columns: _col0 (type: int)
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          TableScan
-            alias: y
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Select Operator
-              expressions: key (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Reduce Output Operator
-                key expressions: _col0 (type: int)
-                sort order: +
-                Map-reduce partition columns: _col0 (type: int)
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          TableScan
-            alias: z
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Select Operator
-              expressions: key (type: int)
-              outputColumnNames: _col0
-              Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-              Reduce Output Operator
-                key expressions: _col0 (type: int)
-                sort order: +
-                Map-reduce partition columns: _col0 (type: int)
-                Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-      Reduce Operator Tree:
-        Join Operator
-          condition map:
-               Outer Join 0 to 1
-               Outer Join 1 to 2
-          keys:
-            0 _col0 (type: int)
-            1 _col0 (type: int)
-            2 _col0 (type: int)
-          outputColumnNames: _col1
-          Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-          Select Operator
-            expressions: _col1 (type: int)
-            outputColumnNames: _col0
-            Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-            Group By Operator
-              aggregations: count(1)
-              keys: _col0 (type: int)
-              mode: hash
-              outputColumnNames: _col0, _col1
-              Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-              File Output Operator
-                compressed: false
-                table:
-                    input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                    output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                    serde: org.apache.hadoop.hive.serde2.lazybinary.LazyBinarySerDe
-
-  Stage: Stage-2
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            Reduce Output Operator
-              key expressions: _col0 (type: int)
-              sort order: +
-              Map-reduce partition columns: _col0 (type: int)
-              Statistics: Num rows: 15 Data size: 66 Basic stats: COMPLETE Column stats: NONE
-              value expressions: _col1 (type: bigint)
-      Reduce Operator Tree:
-        Group By Operator
-          aggregations: count(VALUE._col0)
-          keys: KEY._col0 (type: int)
-          mode: mergepartial
-          outputColumnNames: _col0, _col1
-          Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-          Select Operator
-            expressions: hash(_col0) (type: int), hash(_col1) (type: int)
-            outputColumnNames: _col0, _col1
-            Statistics: Num rows: 7 Data size: 30 Basic stats: COMPLETE Column stats: NONE
-            Group By Operator
-              aggregations: sum(_col0), sum(_col1)
-              mode: hash
-              outputColumnNames: _col0, _col1
-              Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-              File Output Operator
-                compressed: false
-                table:
-                    input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                    output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                    serde: org.apache.hadoop.hive.serde2.lazybinary.LazyBinarySerDe
-
-  Stage: Stage-3
-    Map Reduce
-      Map Operator Tree:
-          TableScan
-            Reduce Output Operator
-              sort order: 
-              Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-              value expressions: _col0 (type: bigint), _col1 (type: bigint)
-      Reduce Operator Tree:
-        Group By Operator
-          aggregations: sum(VALUE._col0), sum(VALUE._col1)
-          mode: mergepartial
-          outputColumnNames: _col0, _col1
-          Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-          File Output Operator
-            compressed: false
-            Statistics: Num rows: 1 Data size: 16 Basic stats: COMPLETE Column stats: NONE
-            table:
-                input format: org.apache.hadoop.mapred.SequenceFileInputFormat
-                output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
-                serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
-
-  Stage: Stage-0
-    Fetch Operator
-      limit: -1
-      Processor Tree:
-        ListSink
-
-PREHOOK: query: SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x FULL OUTER JOIN T1 y ON (x.key = y.key) FULL OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-PREHOOK: type: QUERY
-PREHOOK: Input: default@t1
-PREHOOK: Input: default@t2
-PREHOOK: Input: default@t3
-#### A masked pattern was here ####
-POSTHOOK: query: SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt))
-FROM (SELECT y.key AS key, count(1) AS cnt
-      FROM T2 x FULL OUTER JOIN T1 y ON (x.key = y.key) FULL OUTER JOIN T3 z ON (y.key = z.key)
-      GROUP BY y.key) tmp
-POSTHOOK: type: QUERY
-POSTHOOK: Input: default@t1
-POSTHOOK: Input: default@t2
-POSTHOOK: Input: default@t3
-#### A masked pattern was here ####
-21	14


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