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https://issues.apache.org/jira/browse/HIVE-14027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15348967#comment-15348967
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Jesus Camacho Rodriguez commented on HIVE-14027:
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It seems to be a problem in the execution side, not in the planner.
If we set hive.auto.convert.join to false, we get correct results.
> NULL values produced by left outer join do not behave as NULL
> -------------------------------------------------------------
>
> Key: HIVE-14027
> URL: https://issues.apache.org/jira/browse/HIVE-14027
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 1.2.1
> Reporter: Vaibhav Gumashta
> Assignee: Vaibhav Gumashta
>
> Consider the following setup:
> {code}
> create table tbl (n bigint, t string);
> insert into tbl values (1, 'one');
> insert into tbl values(2, 'two');
> select a.n, a.t, isnull(b.n), isnull(b.t) from (select * from tbl where n =
> 1) a left outer join (select * from tbl where 1 = 2) b on a.n = b.n;
> 1 one false true
> {code}
> The query should return true for isnull(b.n).
> I've tested by inserting a row with null value for the bigint column into
> tbl, and isnull returns true in that case.
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