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https://issues.apache.org/jira/browse/IMPALA-7960?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bikramjeet Vig resolved IMPALA-7960.
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Resolution: Fixed
Fix Version/s: Impala 3.2.0
> 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
> Fix For: Impala 3.2.0
>
>
> 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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