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https://issues.apache.org/jira/browse/DRILL-4665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15336911#comment-15336911
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Gautam Kumar Parai commented on DRILL-4665:
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I have created the pull request https://github.com/apache/drill/pull/526
[~amansinha100] could you please take a look? Thanks!
> 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
> Assignee: Gautam Kumar Parai
>
> This problem was initially reported by Shankar Mane
> <shankar.m...@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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