[jira] [Created] (DRILL-5357) Partition pruning information not available in query plan for COUNT aggregate query

["Khurram Faraaz (JIRA)" <ji...@apache.org>]

Khurram Faraaz created DRILL-5357:
-------------------------------------

             Summary: 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
            Priority: Critical


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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