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https://issues.apache.org/jira/browse/HIVE-3904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13554967#comment-13554967
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Phabricator commented on HIVE-3904:
-----------------------------------
njain has commented on the revision "HIVE-3904 [jira] Replace hashmaps in
JoinOperators to array".
INLINE COMMENTS
ql/src/java/org/apache/hadoop/hive/ql/exec/CommonJoinOperator.java:212 Why is
this if check needed ?
I mean, it was not there previously- why should changing the hashmap to an
array
change anything.
REVISION DETAIL
https://reviews.facebook.net/D7959
To: JIRA, navis
Cc: njain
> Replace hashmaps in JoinOperators to array
> ------------------------------------------
>
> Key: HIVE-3904
> URL: https://issues.apache.org/jira/browse/HIVE-3904
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Navis
> Assignee: Navis
> Priority: Trivial
> Attachments: HIVE-3904.D7959.1.patch
>
>
> Join operator has many HashMaps that maps tag to some internal
> value(ExprEvals, OIs, etc.) and theses are accessed 5 or more times per an
> object, which is seemed unnecessary overhead.
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