[IMPALA-2199] Row count not updated when compute incremental stats is used with a partition spec that contains no data

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: Impala 2.2
• Fix Version/s: Impala 2.2.7, Impala 2.3.0
• Labels: correctness ramp-up
• Target Version: Impala 2.2.7, Impala 2.3.0
• Assignee: Chris Channing
• Reporter: Chris Channing
• Created: 11/Aug/15 09:29
• Updated: 04/Jan/17 23:58
• Resolved: 13/Aug/15 10:31

Description

If 'COMPUTE INCREMENTAL STATS tbl PARTITION (x=y)' is used on an empty partition, the row count is left as -1, Impala should update this with 0.

To reproduce:

create table foo (x string) partitioned by (y int);
alter table foo add partition (y = 1);
compute incremental stats foo partition (y = 1);

+-----------------------------------------+
| summary                                 |
+-----------------------------------------+
| Updated 0 partition(s) and 1 column(s). |
+-----------------------------------------+

+-------+-------+--------+------+--------------+-------------------+--------+-------------------+-----------------------------------------------+
| y     | #Rows | #Files | Size | Bytes Cached | Cache Replication | Format | Incremental stats | Location                                      |
+-------+-------+--------+------+--------------+-------------------+--------+-------------------+-----------------------------------------------+
| 1     | -1    | 0      | 0B   | NOT CACHED   | NOT CACHED        | TEXT   | false             | hdfs://localhost:20500/test-warehouse/foo/y=1 |
| Total | 0     | 0      | 0B   | 0B           |                   |        |                   |                                               |
+-------+-------+--------+------+--------------+-------------------+--------+-------------------+-----------------------------------------------+