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https://issues.apache.org/jira/browse/HIVE-4165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13601824#comment-13601824
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Vikram Dixit K commented on HIVE-4165:
--------------------------------------
In UnionOperator class:
{noformat}
/**
* Union operators are not allowed either before or after a explicit mapjoin
hint.
* Note that, the same query would just work without the mapjoin hint (by
setting
* hive.auto.convert.join to true).
**/
@Override
public boolean opAllowedBeforeMapJoin() {
return false;
}
@Override
public boolean opAllowedAfterMapJoin() {
return false;
}
{noformat}
> Union failures with mapjoin hints
> ---------------------------------
>
> Key: HIVE-4165
> URL: https://issues.apache.org/jira/browse/HIVE-4165
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.11.0
> Reporter: Vikram Dixit K
>
> While running the unit tests - union_remove_12.q which has mapjoin hints
> fails. Although this is a hadoop 23 only test, the same is reproducible on
> any union test with mapjoin hints. For e.g. union_22.q regardless of if we
> have the auto.convert.join=true/false, I see that we fail.
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