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https://issues.apache.org/jira/browse/HIVE-14418?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15435981#comment-15435981
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Sergey Shelukhin commented on HIVE-14418:
-----------------------------------------
reset only removes overrides in the session; unset sets it to default value
> Hive config validation prevents unsetting the settings
> ------------------------------------------------------
>
> Key: HIVE-14418
> URL: https://issues.apache.org/jira/browse/HIVE-14418
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Attachments: HIVE-14418.01.patch, HIVE-14418.02.patch,
> HIVE-14418.03.patch, HIVE-14418.patch
>
>
> {noformat}
> hive> set hive.tez.task.scale.memory.reserve.fraction.max=;
> Query returned non-zero code: 1, cause: 'SET
> hive.tez.task.scale.memory.reserve.fraction.max=' FAILED because
> hive.tez.task.scale.memory.reserve.fraction.max expects FLOAT type value.
> hive> set hive.tez.task.scale.memory.reserve.fraction.max=null;
> Query returned non-zero code: 1, cause: 'SET
> hive.tez.task.scale.memory.reserve.fraction.max=null' FAILED because
> hive.tez.task.scale.memory.reserve.fraction.max expects FLOAT type value.
> {noformat}
> unset also doesn't work.
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