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https://issues.apache.org/jira/browse/HIVE-26618?focusedWorklogId=815550&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-815550
]
ASF GitHub Bot logged work on HIVE-26618:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 11/Oct/22 08:55
Start Date: 11/Oct/22 08:55
Worklog Time Spent: 10m
Work Description: kasakrisz opened a new pull request, #3659:
URL: https://github.com/apache/hive/pull/3659
### What changes were proposed in this pull request?
* Add config setting to control whether to remove parts of query plan
produces empty result.
* Query the value of the setting from the config stored in session when
creating `HiveRelBuilder` instance.
### Why are the changes needed?
* add feature switch
### Does this PR introduce _any_ user-facing change?
New config setting is introduced. Based on the values of the config query
execution plan may changes.
### How was this patch tested?
```
mvn test -Dtest.output.overwrite -Dtest=TestMiniLlapLocalCliDriver
-Dqfile=empty_result.q -pl itests/qtest -Pitests
```
Issue Time Tracking
-------------------
Worklog Id: (was: 815550)
Remaining Estimate: 0h
Time Spent: 10m
> Add setting to turn on/off removing sections of a query plan known never
> produces rows
> --------------------------------------------------------------------------------------
>
> Key: HIVE-26618
> URL: https://issues.apache.org/jira/browse/HIVE-26618
> Project: Hive
> Issue Type: Improvement
> Components: CBO
> Reporter: Krisztian Kasa
> Assignee: Krisztian Kasa
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> HIVE-26524 introduced an optimization to remove sections of query plan known
> never produces rows.
> Add a setting into hive conf to turn on/off this optimization.
> When the optimization is turned off restore the legacy behavior:
> * represent empty result operator with {{HiveSortLimit}} 0
> * disable {{HiveRemoveEmptySingleRules}}
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