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From "Chun Chang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-4665) Partition pruning not working for hive partitioned table with 'LIKE' and '=' filter
Date Tue, 10 May 2016 21:23:13 GMT
Chun Chang created DRILL-4665:
---------------------------------

             Summary: Partition pruning not working for hive partitioned table with 'LIKE'
and '=' filter
                 Key: DRILL-4665
                 URL: https://issues.apache.org/jira/browse/DRILL-4665
             Project: Apache Drill
          Issue Type: Bug
          Components: Query Planning & Optimization, Storage - Hive
    Affects Versions: 1.6.0
            Reporter: Chun Chang


This problem was initially reported by Shankar Mane <shankar.mane@games24x7.com>

> Problem:
>
> 1. In drill, we are using hive partition table. But explain plan (same
> query) for like and = operator differs and used all partitions in case of
> like operator.
> 2. If you see below drill explain plans: Like operator uses *all*
> partitions where
> = operator uses *only* partition filtered by log_date condition.

I reproduced the reported issue. I have a partitioned hive external table with the following
schema:

{noformat}
create external table if not exists lineitem_partitioned (
    l_orderkey bigint,
    l_partkey bigint,
    l_suppkey bigint,
    l_linenumber bigint,
    l_quantity double,
    l_extendedprice double,
    l_discount double,
    l_tax double,
    l_returnflag string,
    l_linestatus string,
    l_shipdate string,
    l_commitdate string,
    l_receiptdate string,
    l_shipinstruct string,
    l_shipmode string,
    l_comment string
)
partitioned by (year int, month int, day int)
STORED AS PARQUET
LOCATION '/drill/testdata/tpch100_dir_partitioned_50000files/lineitem';

alter table lineitem_partitioned add partition(year=2015, month=1, day=1) location  '/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/1';
alter table lineitem_partitioned add partition(year=2015, month=1, day=2) location  '/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/2';
alter table lineitem_partitioned add partition(year=2015, month=1, day=3) location  '/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/3';
alter table lineitem_partitioned add partition(year=2015, month=1, day=4) location  '/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/4';
alter table lineitem_partitioned add partition(year=2015, month=1, day=5) location  '/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/5';
alter table lineitem_partitioned add partition(year=2015, month=1, day=6) location  '/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/6';
alter table lineitem_partitioned add partition(year=2015, month=1, day=7) location  '/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/7';
alter table lineitem_partitioned add partition(year=2015, month=1, day=8) location  '/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/8';
alter table lineitem_partitioned add partition(year=2015, month=1, day=9) location  '/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/9';
alter table lineitem_partitioned add partition(year=2015, month=1, day=10) location  '/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/10';
{noformat}

Without 'LIKE', drill plans right:

{noformat}
0: jdbc:drill:schema=dfs.drillTestDir> explain plan for select l_shipdate, l_linestatus,
l_shipinstruct, `day` from lineitem_partitioned_db2k_2_999 where `day` = 2 limit 10;
+------+------+
| text | json |
+------+------+
| 00-00    Screen
00-01      Project(l_shipdate=[$0], l_linestatus=[$1], l_shipinstruct=[$2], day=[$3])
00-02        SelectionVectorRemover
00-03          Limit(fetch=[10])
00-04            Limit(fetch=[10])
00-05              Project(l_shipdate=[$1], l_linestatus=[$0], l_shipinstruct=[$2], day=[$3])
00-06                Scan(groupscan=[HiveScan [table=Table(dbName:md815_db2k, tableName:lineitem_partitioned_db2k_2_999),
columns=[`l_linestatus`, `l_shipdate`, `l_shipinstruct`, `day`], numPartitions=1, partitions=
[Partition(values:[2015, 1, 2])], inputDirectories=[maprfs:/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/2]]])
{noformat}

With 'LIKE', pruning is not happening:

{noformat}
0: jdbc:drill:schema=dfs.drillTestDir> explain plan for select l_shipdate, l_linestatus,
l_shipinstruct, `day` from lineitem_partitioned_db2k_2_999 where `day` = 2 and l_shipinstruct
like '%BACK%' limit 10;
+------+------+
| text | json |
+------+------+
| 00-00    Screen
00-01      Project(l_shipdate=[$0], l_linestatus=[$1], l_shipinstruct=[$2], day=[$3])
00-02        SelectionVectorRemover
00-03          Limit(fetch=[10])
00-04            Limit(fetch=[10])
00-05              Project(l_shipdate=[$1], l_linestatus=[$0], l_shipinstruct=[$2], day=[$3])
00-06                SelectionVectorRemover
00-07                  Filter(condition=[AND(=($3, 2), LIKE($2, '%BACK%'))])
00-08                    Scan(groupscan=[HiveScan [table=Table(dbName:md815_db2k, tableName:lineitem_partitioned_db2k_2_999),
columns=[`l_linestatus`, `l_shipdate`, `l_shipinstruct`, `day`], numPartitions=10, partitions=
[Partition(values:[2015, 1, 1]), Partition(values:[2015, 1, 10]), Partition(values:[2015,
1, 2]), Partition(values:[2015, 1, 3]), Partition(values:[2015, 1, 4]), Partition(values:[2015,
1, 5]), Partition(values:[2015, 1, 6]), Partition(values:[2015, 1, 7]), Partition(values:[2015,
1, 8]), Partition(values:[2015, 1, 9])], inputDirectories=[maprfs:/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/1,
maprfs:/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/10, maprfs:/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/2,
maprfs:/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/3, maprfs:/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/4,
maprfs:/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/5, maprfs:/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/6,
maprfs:/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/7, maprfs:/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/8,
maprfs:/drill/testdata/tpch100_dir_partitioned_50000files/lineitem/2015/1/9]]])
{noformat}




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