[jira] [Assigned] (HIVE-21172) DEFAULT keyword handling in MERGE UPDATE clause issues

["Krisztian Kasa (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-21172?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Krisztian Kasa reassigned HIVE-21172:
-------------------------------------

    Assignee: Krisztian Kasa

> 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
>
> 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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