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Posted to issues@drill.apache.org by "Jacques Nadeau (JIRA)" <ji...@apache.org> on 2015/05/17 23:10:00 UTC
[jira] [Updated] (DRILL-3121) Hive partition pruning is not
happening
[ https://issues.apache.org/jira/browse/DRILL-3121?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jacques Nadeau updated DRILL-3121:
----------------------------------
Fix Version/s: 1.1.0
> 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
> Fix For: 1.1.0
>
>
> 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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