[jira] [Commented] (HIVE-4165) Union failures with mapjoin hints

["Vikram Dixit K (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-4165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13601824#comment-13601824 ] 

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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