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https://issues.apache.org/jira/browse/HIVE-4572?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13663236#comment-13663236
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Yin Huai commented on HIVE-4572:
--------------------------------
[~hagleitn] Yes, it is correct.
I have tested it on trunk. All tests pass. There were 7 failures and 3 errors
when I ran the entire unit tests. But, all of these cases pass when I tested
them individually.
> ColumnPruner cannot preserve RS key columns corresponding to un-selected join
> keys in columnExprMap
> ---------------------------------------------------------------------------------------------------
>
> Key: HIVE-4572
> URL: https://issues.apache.org/jira/browse/HIVE-4572
> Project: Hive
> Issue Type: Bug
> Affects Versions: 0.12.0
> Reporter: Yin Huai
> Assignee: Yin Huai
> Attachments: HIVE-4572.1.patch.txt, HIVE-4572.2.patch.txt,
> HIVE-4572.replay.patch
>
>
> For a RS of a join operator, if the join key corresponding to this RS does
> not appear in the SELECT clause, ColumnPruner will drop the entry of this
> column in colExprMap.
> Example:
> {code}
> SELECT x.key FROM src1 x JOIN src y ON (x.key = y.key);
> {\code}
> Before CP,
> {code}
> colExprMap of RS corresponding to x: {VALUE._col3=Column[INPUT__FILE__NAME],
> VALUE._col2=Column[BLOCK__OFFSET__INSIDE__FILE], VALUE._col1=Column[value],
> VALUE._col0=Column[key]};
> colExprMap of RS corresponding to y: {VALUE._col3=Column[INPUT__FILE__NAME],
> VALUE._col2=Column[BLOCK__OFFSET__INSIDE__FILE], VALUE._col1=Column[value],
> VALUE._col0=Column[key]}.
> {\code}
> After CP,
> {code}
> colExprMap of RS corresponding to x: {VALUE._col0=Column[key]};
> colExprMap of RS corresponding to y: {}.
> {\code}
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