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https://issues.apache.org/jira/browse/DRILL-5357?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chun Chang updated DRILL-5357:
------------------------------
Reviewer: Khurram Faraaz
> 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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