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https://issues.apache.org/jira/browse/IMPALA-7960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16719237#comment-16719237
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ASF subversion and git services commented on IMPALA-7960:
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Commit 899bfd10a2a42d40634cdb8c9c670494b3c8945e in impala's branch
refs/heads/master from [~bikram.sngh91]
[ https://git-wip-us.apache.org/repos/asf?p=impala.git;h=899bfd1 ]
IMPALA-7960: Revert "IMPALA-5929: Remove redundant explicit casts to string"
The fix for IMPALA-5929 introduced a bug that produced wrong results.
This bug is detailed in IMPALA-7960. Reverting for now.
This reverts commit 545163bb0a5c86aa02652d0557871f5b694a6c82.
Change-Id: I6f0da62a7ff86f05859a2acbec13a726a9bd6f4c
Reviewed-on: http://gerrit.cloudera.org:8080/12073
Reviewed-by: Zoram Thanga <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
> wrong results when comparing timestamp casted to varchar of smaller length to
> a string literal in a binary predicate
> --------------------------------------------------------------------------------------------------------------------
>
> Key: IMPALA-7960
> URL: https://issues.apache.org/jira/browse/IMPALA-7960
> Project: IMPALA
> Issue Type: Bug
> Affects Versions: Impala 2.12.0
> Reporter: Bikramjeet Vig
> Assignee: Bikramjeet Vig
> Priority: Blocker
> Labels: correctness
>
> Expression rewriting seems to identify this as a redundant cast and removes
> it.
> Steps to re-create:
> {noformat}
> select * from (select cast('2018-12-11 09:59:37' as timestamp) as ts) tbl
> where cast(ts as varchar(10)) = '2018-12-11';
> {noformat}
> output:
> {noformat}
> Fetched 0 row(s)
> {noformat}
> Now disable expression re-writes.
> {noformat}
> set ENABLE_EXPR_REWRITES=false;
> select * from (select cast('2018-12-11 09:59:37' as timestamp) as ts) tbl
> where cast(ts as varchar(10)) = '2018-12-11';
> {noformat}
> output:
> {noformat}
> +---------------------+
> | ts |
> +---------------------+
> | 2018-12-11 09:59:37 |
> +---------------------+
> {noformat}
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