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From "Khurram Faraaz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-5357) Partition pruning information not available in query plan for COUNT aggregate query
Date Thu, 21 Sep 2017 00:32:00 GMT

    [ https://issues.apache.org/jira/browse/DRILL-5357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16174052#comment-16174052
] 

Khurram Faraaz commented on DRILL-5357:
---------------------------------------

Verified fix on Drill 1.12.0 commit: aaff1b35b7339fb4e6ab480dd517994ff9f0a5c5

{noformat}
0: jdbc:drill:schema=dfs.tmp> CREATE TABLE tbl_prtn_prune_01 PARTITION BY (col_state) 
. . . . . . . . . . . . . . > AS 
. . . . . . . . . . . . . . > SELECT CAST(columns[0] AS DATE) col_date, 
. . . . . . . . . . . . . . > CAST(columns[1] AS CHAR(3)) col_state, 
. . . . . . . . . . . . . . > CAST(columns[2] AS INTEGER) col_prime, 
. . . . . . . . . . . . . . > CAST(columns[3] AS VARCHAR(256)) col_varstr, 
. . . . . . . . . . . . . . > CAST(columns[4] AS INTEGER) col_id, 
. . . . . . . . . . . . . . > CAST(columns[5] AS VARCHAR(50)) col_name 
. . . . . . . . . . . . . . > from `partition_prune_data.csv`;
+-----------+----------------------------+
| Fragment  | Number of records written  |
+-----------+----------------------------+
| 0_0       | 1638640                    |
+-----------+----------------------------+
1 row selected (70.986 seconds)

0: jdbc:drill:schema=dfs.tmp> explain plan for select COUNT(*) from tbl_prtn_prune_01 where
col_state = 'CA';
+------+------+
| text | json |
+------+------+
| 00-00    Screen
00-01      Project(EXPR$0=[$0])
00-02        Scan(groupscan=[files = [/tmp/tbl_prtn_prune_01/0_0_5.parquet], numFiles = 1,
DynamicPojoRecordReader{records = [[35653]]}])

Another test

0: jdbc:drill:schema=dfs.tmp> explain plan for  select c1 from `DRILL_4589/1998/Q3` where
c1 > 1000 limit 1;
+------+------+
| text | json |
+------+------+
| 00-00    Screen
00-01      Project(c1=[$0])
00-02        SelectionVectorRemover
00-03          Limit(fetch=[1])
00-04            Limit(fetch=[1])
00-05              Filter(condition=[>($0, 1000)])
00-06                Scan(groupscan=[ParquetGroupScan [entries=[ReadEntryWithPath [path=/tmp/DRILL_4589/1998/Q3/f459.parquet]],
selectionRoot=/tmp/DRILL_4589/1998/Q3, numFiles=1, usedMetadataFile=true, cacheFileRoot=/tmp/DRILL_4589/1998/Q3,
columns=[`c1`]]])
{noformat}

> Partition pruning information not available in query plan for COUNT aggregate query
> -----------------------------------------------------------------------------------
>
>                 Key: DRILL-5357
>                 URL: https://issues.apache.org/jira/browse/DRILL-5357
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Query Planning & Optimization
>    Affects Versions: 1.10.0
>         Environment: 3 node CentOS cluster
>            Reporter: Khurram Faraaz
>            Assignee: Arina Ielchiieva
>             Fix For: 1.12.0
>
>
> We are not seeing partition pruning information in the query plan for the below, COUNT(*)
and COUNT(<col-name>) query 
> Drill 1.10.0-SNAPSHOT
> git commit id: b657d44f
> parquet table has 6 columns
> total number of rows = 1638640
> {noformat}
> 0: jdbc:drill:schema=dfs.tmp> CREATE TABLE tbl_prtn_prune_01 PARTITION BY (col_state)

> AS 
> SELECT CAST(columns[0] AS DATE) col_date, 
> CAST(columns[1] AS CHAR(3)) col_state, 
> CAST(columns[2] AS INTEGER) col_prime, 
> CAST(columns[3] AS VARCHAR(256)) col_varstr, 
> CAST(columns[4] AS INTEGER) col_id, 
> CAST(columns[5] AS VARCHAR(50)) col_name 
> from `partition_prune_data.csv`;
> +-----------+----------------------------+
> | Fragment  | Number of records written  |
> +-----------+----------------------------+
> | 0_0       | 1638640                    |
> +-----------+----------------------------+
> 1 row selected (17.675 seconds)
> 0: jdbc:drill:schema=dfs.tmp> select COUNT(*) from tbl_prtn_prune_01 where col_state
= 'CA';
> +---------+
> | EXPR$0  |
> +---------+
> | 35653   |
> +---------+
> 1 row selected (0.471 seconds)
> 0: jdbc:drill:schema=dfs.tmp> explain plan for select COUNT(*) from tbl_prtn_prune_01
where col_state = 'CA';
> +------+------+
> | text | json |
> +------+------+
> | 00-00    Screen
> 00-01      Project(EXPR$0=[$0])
> 00-02        Project(EXPR$0=[$0])
> 00-03          Scan(groupscan=[org.apache.drill.exec.store.pojo.PojoRecordReader@1d4bb67d[columns
= null, isStarQuery = false, isSkipQuery = false]])
> {noformat}
> And then I did a REFRESH TABLE METADATA on the parquet table
> {noformat}
> 0: jdbc:drill:schema=dfs.tmp> refresh table metadata tbl_prtn_prune_01;
> +-------+-------------------------------------------------------------+
> |  ok   |                           summary                           |
> +-------+-------------------------------------------------------------+
> | true  | Successfully updated metadata for table tbl_prtn_prune_01.  |
> +-------+-------------------------------------------------------------+
> 1 row selected (0.321 seconds)
> 0: jdbc:drill:schema=dfs.tmp> explain plan for select COUNT(col_state) from tbl_prtn_prune_01
where col_state = 'CA';
> +------+------+
> | text | json |
> +------+------+
> | 00-00    Screen
> 00-01      Project(EXPR$0=[$0])
> 00-02        Project(EXPR$0=[$0])
> 00-03          Scan(groupscan=[org.apache.drill.exec.store.pojo.PojoRecordReader@2e0f4be9[columns
= null, isStarQuery = false, isSkipQuery = false]])
> 0: jdbc:drill:schema=dfs.tmp> explain plan for select COUNT(*) from tbl_prtn_prune_01
where col_state = 'CA';
> +------+------+
> | text | json |
> +------+------+
> | 00-00    Screen
> 00-01      Project(EXPR$0=[$0])
> 00-02        Project(EXPR$0=[$0])
> 00-03          Scan(groupscan=[org.apache.drill.exec.store.pojo.PojoRecordReader@3fc1f8e7[columns
= null, isStarQuery = false, isSkipQuery = false]])
> 0: jdbc:drill:schema=dfs.tmp> explain plan for select COUNT(col_date) from tbl_prtn_prune_01
where col_state = 'CA';
> +------+------+
> | text | json |
> +------+------+
> | 00-00    Screen
> 00-01      Project(EXPR$0=[$0])
> 00-02        Project(EXPR$0=[$0])
> 00-03          Scan(groupscan=[org.apache.drill.exec.store.pojo.PojoRecordReader@7afc851e[columns
= null, isStarQuery = false, isSkipQuery = false]])
> {noformat}



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