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Posted to issues@hive.apache.org by "Vineet Garg (JIRA)" <ji...@apache.org> on 2017/06/01 22:54:04 UTC
[jira] [Updated] (HIVE-16809) Improve filter condition for
correlated subqueries
[ https://issues.apache.org/jira/browse/HIVE-16809?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Vineet Garg updated HIVE-16809:
-------------------------------
Status: Patch Available (was: Open)
> Improve filter condition for correlated subqueries
> --------------------------------------------------
>
> Key: HIVE-16809
> URL: https://issues.apache.org/jira/browse/HIVE-16809
> Project: Hive
> Issue Type: Improvement
> Reporter: Vineet Garg
> Assignee: Vineet Garg
> Attachments: HIVE-16809.1.patch
>
>
> A filter condition such as {{col1=col1}} generated during rewrite of subqueries is not folded/rewritten into {{co1 is not null}}. This messes up the statistic estimation and could result in bad plans.
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