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https://issues.apache.org/jira/browse/IMPALA-10836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17428637#comment-17428637
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Sheng Wang commented on IMPALA-10836:
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Thanks [~stigahuang], the second situation is indeed same as IMPALA-10969. But
I found that this Jira is created two month ago, I've already finished the
second optimization in my own environment. If no one plan to do this feature,
I would like to contribute my code.
> Add simplify cast rule
> ----------------------
>
> Key: IMPALA-10836
> URL: https://issues.apache.org/jira/browse/IMPALA-10836
> Project: IMPALA
> Issue Type: Improvement
> Components: Frontend
> Reporter: Xianqing He
> Assignee: Xianqing He
> Priority: Major
> Fix For: Impala 4.1.0
>
>
> For the function cast we can add the following optimizations:
> # Removes the inner case conversion expressions that are unnecessary, e.g.
> cast(cast(col as int) as string) => cast(col as string)
> # Removes unnecessary cast when the input is already the correct type, e.g.
> col is bigint, cast(col as bigint) => col
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