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Posted to issues@drill.apache.org by "Hao Zhu (JIRA)" <ji...@apache.org> on 2015/05/17 21:41:59 UTC
[jira] [Created] (DRILL-3121) Hive partition pruning is not
happening
Hao Zhu created DRILL-3121:
------------------------------
Summary: Hive partition pruning is not happening
Key: DRILL-3121
URL: https://issues.apache.org/jira/browse/DRILL-3121
Project: Apache Drill
Issue Type: Bug
Components: Execution - Flow
Affects Versions: 1.0.0
Reporter: Hao Zhu
Assignee: Chris Westin
Tested on 1.0.0 with below commit id, and hive 0.13.
{code}
> select * from sys.version;
+-------------------------------------------+--------------------------------------------------------------------+----------------------------+--------------+----------------------------+
| commit_id | commit_message | commit_time | build_email | build_time |
+-------------------------------------------+--------------------------------------------------------------------+----------------------------+--------------+----------------------------+
| d8b19759657698581cc0d01d7038797952888123 | DRILL-3100: TestImpersonationDisabledWithMiniDFS fails on Windows | 15.05.2015 @ 01:18:03 EDT | Unknown | 15.05.2015 @ 03:07:10 EDT |
+-------------------------------------------+--------------------------------------------------------------------+----------------------------+--------------+----------------------------+
1 row selected (0.083 seconds)
{code}
How to reproduce:
1. Use hive to create below partition table:
{code}
CREATE TABLE partition_table(id INT, username string)
PARTITIONED BY(year STRING, month STRING)
ROW FORMAT DELIMITED FIELDS TERMINATED BY ",";
insert into table partition_table PARTITION(year='2014',month='11') select 1,'u' from passwords limit 1;
insert into table partition_table PARTITION(year='2014',month='12') select 2,'s' from passwords limit 1;
insert into table partition_table PARTITION(year='2015',month='01') select 3,'e' from passwords limit 1;
insert into table partition_table PARTITION(year='2015',month='02') select 4,'r' from passwords limit 1;
insert into table partition_table PARTITION(year='2015',month='03') select 5,'n' from passwords limit 1;
{code}
2. Hive query can do partition pruning for below 2 queries:
{code}
hive> explain EXTENDED select * from partition_table where year='2015' and month in ( '02','03') ;
partition values:
month 02
year 2015
partition values:
month 03
year 2015
explain EXTENDED select * from partition_table where year='2015' and (month >= '02' and month <= '03') ;
partition values:
month 02
year 2015
partition values:
month 03
year 2015
{code}
Hive only scans 2 partitions -- 2015/02 and 2015/03.
3. Drill can not do partition pruning for below 2 queries:
{code}
> explain plan for select * from hive.partition_table where `year`='2015' and `month` in ('02','03');
+------+------+
| text | json |
+------+------+
| 00-00 Screen
00-01 Project(id=[$0], username=[$1], year=[$2], month=[$3])
00-02 SelectionVectorRemover
00-03 Filter(condition=[AND(=($2, '2015'), OR(=($3, '02'), =($3, '03')))])
00-04 Scan(groupscan=[HiveScan [table=Table(dbName:default, tableName:partition_table), inputSplits=[maprfs:/user/hive/warehouse/partition_table/year=2015/month=01/000000_0:0+4, maprfs:/user/hive/warehouse/partition_table/year=2015/month=02/000000_0:0+4, maprfs:/user/hive/warehouse/partition_table/year=2015/month=03/000000_0:0+4], columns=[`*`], partitions= [Partition(values:[2015, 01]), Partition(values:[2015, 02]), Partition(values:[2015, 03])]]])
> explain plan for select * from hive.partition_table where `year`='2015' and (`month` >= '02' and `month` <= '03' );
+------+------+
| text | json |
+------+------+
| 00-00 Screen
00-01 Project(id=[$0], username=[$1], year=[$2], month=[$3])
00-02 SelectionVectorRemover
00-03 Filter(condition=[AND(=($2, '2015'), >=($3, '02'), <=($3, '03'))])
00-04 Scan(groupscan=[HiveScan [table=Table(dbName:default, tableName:partition_table), inputSplits=[maprfs:/user/hive/warehouse/partition_table/year=2015/month=01/000000_0:0+4, maprfs:/user/hive/warehouse/partition_table/year=2015/month=02/000000_0:0+4, maprfs:/user/hive/warehouse/partition_table/year=2015/month=03/000000_0:0+4], columns=[`*`], partitions= [Partition(values:[2015, 01]), Partition(values:[2015, 02]), Partition(values:[2015, 03])]]])
{code}
Drill scans 3 partitions -- 2015/01, 2015/02 and 2015/03.
Note: if the inlist only has 1 value, Drill can do partition pruning well:
{code}
> explain plan for select * from hive.partition_table where `year`='2015' and `month` in ('02');
+------+------+
| text | json |
+------+------+
| 00-00 Screen
00-01 Project(id=[$0], username=[$1], year=[$2], month=[$3])
00-02 Scan(groupscan=[HiveScan [table=Table(dbName:default, tableName:partition_table), inputSplits=[maprfs:/user/hive/warehouse/partition_table/year=2015/month=02/000000_0:0+4], columns=[`*`], partitions= [Partition(values:[2015, 02])]]])
{code}
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