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https://issues.apache.org/jira/browse/HIVE-2810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13213412#comment-13213412
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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:
https://issues.apache.org/jira/browse/HIVE-741?focusedCommentId=12896789&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-12896789
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.
REVISION DETAIL
https://reviews.facebook.net/D1791
BRANCH
DPAL-843
> Implement NULL-safe equality operator <=>
> -----------------------------------------
>
> Key: HIVE-2810
> URL: https://issues.apache.org/jira/browse/HIVE-2810
> 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:
> http://dev.mysql.com/doc/refman/5.0/en/comparison-operators.html#operator_equal-to
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