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Posted to issues@hive.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2022/06/29 11:47:00 UTC
[jira] [Work logged] (HIVE-26365) Remove column statistics collection task from merge statement plan
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HIVE-26365](https://issues.apache.org/jira/browse/HIVE-26365)
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kasakrisz opened a new pull request, #3411:
URL: <https://github.com/apache/hive/pull/3411>
1. 1. 1. What changes were proposed in this pull request?
Disable generating auto column stats collecting pipeline in the execution plan
in case of Update/Delete/Merge statements.
1. 1. 1. Why are the changes needed?
* Column stats are marked stale after executing Update/Delete/Merge statements because it can not be generated from the changed rows in case of delete operation so adding the pipeline into insert branches of a merge does not makes sense.
* For Update/Delete statements only the way we checking whether adding the pipeline is refactored.
1. 1. 1. Does this PR introduce _any_ user-facing change?
No. But output of explain merge statements may changes.
1. 1. 1. How was this patch tested?
```
mvn test -Dtest.output.overwrite -DskipSparkTests
-Dtest=TestMiniLlapLocalCliDriver -Dqfile=sqlmerge.q,sqlmerge_stats.q -pl
itests/qtest -Pitests
```
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