[
https://issues.apache.org/jira/browse/HIVE-21172?focusedWorklogId=692674&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-692674
]
ASF GitHub Bot logged work on HIVE-21172:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 08/Dec/21 15:33
Start Date: 08/Dec/21 15:33
Worklog Time Spent: 10m
Work Description: kasakrisz opened a new pull request #2857:
URL: https://github.com/apache/hive/pull/2857
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### What changes were proposed in this pull request?
When generating the insert part of an update clause of a merge statement
replace the default keywords to the corresponding default values defined in
default constraints.
### Why are the changes needed?
To support splitting update clauses of merge statements into two insert
branches: one for inserting new values and one for inserting into delete
deltas. The first insert doesn't have to be sorted which can give a performance
boost. See [HIVE-21158](https://issues.apache.org/jira/browse/HIVE-21158) and
[HIVE-21159](https://issues.apache.org/jira/browse/HIVE-21159) for more details.
When 'default' keyword is used the optimization can not be triggered because
the compilation of the rewritten statement failed.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
```
mvn test -Dtest.output.overwrite -DskipSparkTests
-Dtest=TestMiniLlapLocalCliDriver -Dqfile=sqlmerge_stats.q -pl itests/qtest
-Pitests
```
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Issue Time Tracking
-------------------
Worklog Id: (was: 692674)
Remaining Estimate: 0h
Time Spent: 10m
> DEFAULT keyword handling in MERGE UPDATE clause issues
> ------------------------------------------------------
>
> Key: HIVE-21172
> URL: https://issues.apache.org/jira/browse/HIVE-21172
> Project: Hive
> Issue Type: Sub-task
> Components: SQL, Transactions
> Affects Versions: 4.0.0
> Reporter: Eugene Koifman
> Assignee: Krisztian Kasa
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> once HIVE-21159 lands, enable {{HiveConf.MERGE_SPLIT_UPDATE}} and run these
> tests.
> TestMiniLlapLocalCliDriver.testCliDriver[sqlmerge_stats]
> mvn test -Dtest=TestMiniLlapLocalCliDriver
> -Dqfile=insert_into_default_keyword.q
> Merge is rewritten as a multi-insert. When Update clause has DEFAULT, it's
> not properly replaced with a value in the muli-insert - it's treated as a
> literal
> {noformat}
> INSERT INTO `default`.`acidTable` -- update clause(insert part)
> SELECT `t`.`key`, `DEFAULT`, `t`.`value`
> WHERE `t`.`key` = `s`.`key` AND `s`.`key` > 3 AND NOT(`s`.`key` < 3)
> {noformat}
> See {{LOG.info("Going to reparse <" + originalQuery + "> as \n<" +
> rewrittenQueryStr.toString() + ">");}} in hive.log
> {{MergeSemanticAnalyzer.replaceDefaultKeywordForMerge()}} is only called in
> {{handleInsert}} but not {{handleUpdate()}}. Why does issue only show up with
> {{MERGE_SPLIT_UPDATE}}?
> Once this is fixed, HiveConf.MERGE_SPLIT_UPDATE should be true by default
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