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https://issues.apache.org/jira/browse/HIVE-4105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13592974#comment-13592974
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Vikram Dixit K commented on HIVE-4105:
--------------------------------------
Hey Vinod,
You are missing the piece of code required for outer joins. Near the if
(!noOuterJoin), I recommend that you keep the previous code and set the
jionNeeded flag to true when noOuterJoin = false.
Basically:
{noformat}
if (!noOuterJoin) {
joinNeeded = true;
storage[pos] = dummyObjVectors[pos];
} else {
storage[pos] = emptyList;
}
{noformat}
> Hive MapJoinOperator unnecessarily deserializes values for all join-keys
> ------------------------------------------------------------------------
>
> Key: HIVE-4105
> URL: https://issues.apache.org/jira/browse/HIVE-4105
> Project: Hive
> Issue Type: Bug
> Reporter: Vinod Kumar Vavilapalli
> Attachments: HIVE-4105-20130301.1.txt, HIVE-4105-20130301.txt
>
>
> We can avoid this for inner-joins. Hive does an explicit value
> de-serialization up front so even for those rows which won't emit output. In
> these cases, we can do just with key de-serialization.
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