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From "Arina Ielchiieva (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (DRILL-5357) Partition pruning information not available in query plan for COUNT aggregate query
Date Tue, 15 Aug 2017 15:10:02 GMT

     [ https://issues.apache.org/jira/browse/DRILL-5357?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arina Ielchiieva resolved DRILL-5357.
-------------------------------------
       Resolution: Fixed
    Fix Version/s: 1.12.0

Fixed in the scope of DRILL-4735.

> 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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