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Posted to issues@hive.apache.org by "Lefty Leverenz (JIRA)" <ji...@apache.org> on 2017/02/16 08:40:42 UTC
[jira] [Comment Edited] (HIVE-15227) Optimize join + gby into
semijoin
[ https://issues.apache.org/jira/browse/HIVE-15227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15717574#comment-15717574 ]
Lefty Leverenz edited comment on HIVE-15227 at 2/16/17 8:40 AM:
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Doc note: *hive.enable.semijoin.conversion* needs to be documented in the wiki for release 2.2.0.
* [Configuration Properties -- Query and DDL Execution | https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-QueryandDDLExecution]
Added a TODOC2.2 label.
Edit (16/Feb/17): HIVE-15894 changes the parameter name from *hive.enable.semijoin.conversion* to *hive.optimize.semijoin.conversion*, also in release 2.2.0.
was (Author: lefty@hortonworks.com):
Doc note: *hive.enable.semijoin.conversion* needs to be documented in the wiki for release 2.2.0.
* [Configuration Properties -- Query and DDL Execution | https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-QueryandDDLExecution]
Added a TODOC2.2 label.
> Optimize join + gby into semijoin
> ---------------------------------
>
> Key: HIVE-15227
> URL: https://issues.apache.org/jira/browse/HIVE-15227
> Project: Hive
> Issue Type: Bug
> Components: Logical Optimizer
> Reporter: Ashutosh Chauhan
> Assignee: Ashutosh Chauhan
> Labels: TODOC2.2
> Fix For: 2.2.0
>
> Attachments: HIVE-15227.2.patch, HIVE-15227.3.patch, HIVE-15227.4.patch, HIVE-15227.patch
>
>
> Calcite has a rule which can do this transformation. Lets take advantage of this since Hive has native Left semi join operator.
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