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From "Phabricator (Commented) (JIRA)" <>
Subject [jira] [Commented] (HIVE-2810) Implement NULL-safe equality operator <=>
Date Wed, 22 Feb 2012 07:10:50 GMT


Phabricator commented on HIVE-2810:

cwsteinbach has commented on the revision "HIVE-2810 [jira] Implement NULL-safe equality operator

  Yup, exactly. I tried running the query from HIVE-741:

  This works:
  select * from input1 a join input1 b on a.key=b.value;

  But I get the following error when I try to run this:

  select * from input1 a join input1 b on a.key <=> b.value;
  FAILED: Error in semantic analysis: Line 1:40 Both left and right aliases encountered in
JOIN 'value'

  Looks like this may be a parsing issue?

  HIVE-741 added a join_nulls.q test to clientpositive. I think it would be a good idea to
augment this testcase with null-safe equality queries.



> Implement NULL-safe equality operator <=>
> -----------------------------------------
>                 Key: HIVE-2810
>                 URL:
>             Project: Hive
>          Issue Type: New Feature
>          Components: Query Processor, UDF
>    Affects Versions: 0.9.0
>            Reporter: Carl Steinbach
>            Assignee: Navis
>             Fix For: 0.9.0
>         Attachments: HIVE-2810.D1791.1.patch
> Ref:

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