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From "Sahil Takiar (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-17087) HoS Query with multiple Partition Pruning Sinks + subquery has incorrect explain
Date Thu, 13 Jul 2017 21:33:00 GMT
Sahil Takiar created HIVE-17087:
-----------------------------------

             Summary: HoS Query with multiple Partition Pruning Sinks + subquery has incorrect
explain
                 Key: HIVE-17087
                 URL: https://issues.apache.org/jira/browse/HIVE-17087
             Project: Hive
          Issue Type: Sub-task
            Reporter: Sahil Takiar
            Assignee: Sahil Takiar


Ran the following query in the {{TestSparkCliDriver}}:

{code:sql}
set hive.spark.dynamic.partition.pruning=true;
set hive.auto.convert.join=true;

create table partitioned_table1 (col int) partitioned by (part_col int);
create table partitioned_table2 (col int) partitioned by (part_col int);
create table regular_table (col int);
insert into table regular_table values (1);

alter table partitioned_table1 add partition (part_col = 1);
insert into table partitioned_table1 partition (part_col = 1) values (1), (2), (3), (4), (5),
(6), (7), (8), (9), (10);

alter table partitioned_table2 add partition (part_col = 1);
insert into table partitioned_table2 partition (part_col = 1) values (1), (2), (3), (4), (5),
(6), (7), (8), (9), (10);

explain select * from partitioned_table1 where partitioned_table1.part_col in (select regular_table.col
from regular_table join partitioned_table2 on regular_table.col = partitioned_table2.part_col);
{code}

and got the following explain plan:

{code}
STAGE DEPENDENCIES:
  Stage-2 is a root stage
  Stage-4 depends on stages: Stage-2
  Stage-5 depends on stages: Stage-4
  Stage-3 depends on stages: Stage-5
  Stage-1 depends on stages: Stage-3
  Stage-0 depends on stages: Stage-1

STAGE PLANS:
  Stage: Stage-2
    Spark
#### A masked pattern was here ####
      Vertices:
        Map 4 
            Map Operator Tree:
                TableScan
                  alias: partitioned_table1
                  Statistics: Num rows: 10 Data size: 11 Basic stats: COMPLETE Column stats:
NONE
                  Select Operator
                    expressions: col (type: int), part_col (type: int)
                    outputColumnNames: _col0, _col1
                    Statistics: Num rows: 10 Data size: 11 Basic stats: COMPLETE Column stats:
NONE
                    Select Operator
                      expressions: _col1 (type: int)
                      outputColumnNames: _col0
                      Statistics: Num rows: 10 Data size: 11 Basic stats: COMPLETE Column
stats: NONE
                      Group By Operator
                        keys: _col0 (type: int)
                        mode: hash
                        outputColumnNames: _col0
                        Statistics: Num rows: 10 Data size: 11 Basic stats: COMPLETE Column
stats: NONE
                        Spark Partition Pruning Sink Operator
                          partition key expr: part_col
                          Statistics: Num rows: 10 Data size: 11 Basic stats: COMPLETE Column
stats: NONE
                          target column name: part_col
                          target work: Map 3

  Stage: Stage-4
    Spark
#### A masked pattern was here ####
      Vertices:
        Map 2 
            Map Operator Tree:
                TableScan
                  alias: regular_table
                  Statistics: Num rows: 1 Data size: 1 Basic stats: COMPLETE Column stats:
NONE
                  Filter Operator
                    predicate: col is not null (type: boolean)
                    Statistics: Num rows: 1 Data size: 1 Basic stats: COMPLETE Column stats:
NONE
                    Select Operator
                      expressions: col (type: int)
                      outputColumnNames: _col0
                      Statistics: Num rows: 1 Data size: 1 Basic stats: COMPLETE Column stats:
NONE
                      Spark HashTable Sink Operator
                        keys:
                          0 _col0 (type: int)
                          1 _col0 (type: int)
                      Select Operator
                        expressions: _col0 (type: int)
                        outputColumnNames: _col0
                        Statistics: Num rows: 1 Data size: 1 Basic stats: COMPLETE Column
stats: NONE
                        Group By Operator
                          keys: _col0 (type: int)
                          mode: hash
                          outputColumnNames: _col0
                          Statistics: Num rows: 1 Data size: 1 Basic stats: COMPLETE Column
stats: NONE
                          Spark Partition Pruning Sink Operator
                            partition key expr: part_col
                            Statistics: Num rows: 1 Data size: 1 Basic stats: COMPLETE Column
stats: NONE
                            target column name: part_col
                            target work: Map 3
            Local Work:
              Map Reduce Local Work

  Stage: Stage-5
    Spark
#### A masked pattern was here ####

  Stage: Stage-3
    Spark
#### A masked pattern was here ####
      Vertices:
        Map 3 
            Map Operator Tree:
                TableScan
                  alias: partitioned_table2
                  Statistics: Num rows: 10 Data size: 11 Basic stats: COMPLETE Column stats:
NONE
                  Select Operator
                    expressions: part_col (type: int)
                    outputColumnNames: _col0
                    Statistics: Num rows: 10 Data size: 11 Basic stats: COMPLETE Column stats:
NONE
                    Map Join Operator
                      condition map:
                           Inner Join 0 to 1
                      keys:
                        0 _col0 (type: int)
                        1 _col0 (type: int)
                      outputColumnNames: _col0
                      input vertices:
                        0 Map 2
                      Statistics: Num rows: 11 Data size: 12 Basic stats: COMPLETE Column
stats: NONE
                      Group By Operator
                        keys: _col0 (type: int)
                        mode: hash
                        outputColumnNames: _col0
                        Statistics: Num rows: 11 Data size: 12 Basic stats: COMPLETE Column
stats: NONE
                        Spark HashTable Sink Operator
                          keys:
                            0 _col1 (type: int)
                            1 _col0 (type: int)
            Local Work:
              Map Reduce Local Work

  Stage: Stage-1
    Spark
#### A masked pattern was here ####
      Vertices:
        Map 1 
            Map Operator Tree:
                TableScan
                  alias: partitioned_table1
                  Statistics: Num rows: 10 Data size: 11 Basic stats: COMPLETE Column stats:
NONE
                  Select Operator
                    expressions: col (type: int), part_col (type: int)
                    outputColumnNames: _col0, _col1
                    Statistics: Num rows: 10 Data size: 11 Basic stats: COMPLETE Column stats:
NONE
                    Map Join Operator
                      condition map:
                           Left Semi Join 0 to 1
                      keys:
                        0 _col1 (type: int)
                        1 _col0 (type: int)
                      outputColumnNames: _col0, _col1
                      input vertices:
                        1 Map 3
                      Statistics: Num rows: 12 Data size: 13 Basic stats: COMPLETE Column
stats: NONE
                      File Output Operator
                        compressed: false
                        Statistics: Num rows: 12 Data size: 13 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
            Local Work:
              Map Reduce Local Work

  Stage: Stage-0
    Fetch Operator
      limit: -1
      Processor Tree:
        ListSink
{code}

I see a couple of weird things in the above explain plan:
* I don't think there should be a partitioned_table1 scan -> Spark Partition Pruning Sink
* I'm not sure what is happening with Stage-5 of the explain plan

For reference, here is the explain plan for the equivalent query in Hive-on-Tez:

{code}
STAGE DEPENDENCIES:
  Stage-1 is a root stage
  Stage-0 depends on stages: Stage-1

STAGE PLANS:
  Stage: Stage-1
    Tez
#### A masked pattern was here ####
      Edges:
        Map 1 <- Map 3 (BROADCAST_EDGE)
        Map 3 <- Map 2 (BROADCAST_EDGE)
#### A masked pattern was here ####
      Vertices:
        Map 1 
            Map Operator Tree:
                TableScan
                  alias: partitioned_table1
                  Statistics: Num rows: 10 Data size: 51 Basic stats: COMPLETE Column stats:
PARTIAL
                  Select Operator
                    expressions: col (type: int), part_col (type: int)
                    outputColumnNames: _col0, _col1
                    Statistics: Num rows: 10 Data size: 40 Basic stats: COMPLETE Column stats:
PARTIAL
                    Map Join Operator
                      condition map:
                           Left Semi Join 0 to 1
                      keys:
                        0 _col1 (type: int)
                        1 _col0 (type: int)
                      outputColumnNames: _col0, _col1
                      input vertices:
                        1 Map 3
                      Statistics: Num rows: 12 Data size: 48 Basic stats: COMPLETE Column
stats: NONE
                      File Output Operator
                        compressed: false
                        Statistics: Num rows: 12 Data size: 48 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
            Execution mode: llap
            LLAP IO: no inputs
        Map 2 
            Map Operator Tree:
                TableScan
                  alias: regular_table
                  Statistics: Num rows: 1 Data size: 1 Basic stats: COMPLETE Column stats:
NONE
                  Filter Operator
                    predicate: col is not null (type: boolean)
                    Statistics: Num rows: 1 Data size: 1 Basic stats: COMPLETE Column stats:
NONE
                    Select Operator
                      expressions: col (type: int)
                      outputColumnNames: _col0
                      Statistics: Num rows: 1 Data size: 1 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: 1 Data size: 1 Basic stats: COMPLETE Column
stats: NONE
                      Select Operator
                        expressions: _col0 (type: int)
                        outputColumnNames: _col0
                        Statistics: Num rows: 1 Data size: 1 Basic stats: COMPLETE Column
stats: NONE
                        Group By Operator
                          keys: _col0 (type: int)
                          mode: hash
                          outputColumnNames: _col0
                          Statistics: Num rows: 1 Data size: 1 Basic stats: COMPLETE Column
stats: NONE
                          Dynamic Partitioning Event Operator
                            Target column: part_col (int)
                            Target Input: partitioned_table2
                            Partition key expr: part_col
                            Statistics: Num rows: 1 Data size: 1 Basic stats: COMPLETE Column
stats: NONE
                            Target Vertex: Map 3
            Execution mode: llap
            LLAP IO: no inputs
        Map 3 
            Map Operator Tree:
                TableScan
                  alias: partitioned_table2
                  Statistics: Num rows: 10 Data size: 51 Basic stats: COMPLETE Column stats:
COMPLETE
                  Select Operator
                    expressions: part_col (type: int)
                    outputColumnNames: _col0
                    Statistics: Num rows: 10 Data size: 40 Basic stats: COMPLETE Column stats:
COMPLETE
                    Map Join Operator
                      condition map:
                           Inner Join 0 to 1
                      keys:
                        0 _col0 (type: int)
                        1 _col0 (type: int)
                      outputColumnNames: _col0
                      input vertices:
                        0 Map 2
                      Statistics: Num rows: 11 Data size: 44 Basic stats: COMPLETE Column
stats: NONE
                      Group By Operator
                        keys: _col0 (type: int)
                        mode: hash
                        outputColumnNames: _col0
                        Statistics: Num rows: 11 Data size: 44 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: 11 Data size: 44 Basic stats: COMPLETE Column
stats: NONE
                        Select Operator
                          expressions: _col0 (type: int)
                          outputColumnNames: _col0
                          Statistics: Num rows: 11 Data size: 44 Basic stats: COMPLETE Column
stats: NONE
                          Group By Operator
                            keys: _col0 (type: int)
                            mode: hash
                            outputColumnNames: _col0
                            Statistics: Num rows: 11 Data size: 44 Basic stats: COMPLETE Column
stats: NONE
                            Dynamic Partitioning Event Operator
                              Target column: part_col (int)
                              Target Input: partitioned_table1
                              Partition key expr: part_col
                              Statistics: Num rows: 11 Data size: 44 Basic stats: COMPLETE
Column stats: NONE
                              Target Vertex: Map 1
            Execution mode: llap
            LLAP IO: no inputs

  Stage: Stage-0
    Fetch Operator
      limit: -1
      Processor Tree:
        ListSink
{code}



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