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https://issues.apache.org/jira/browse/IMPALA-10969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17428568#comment-17428568
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Sheng Wang commented on IMPALA-10969:
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Hi [~stigahuang], how do you think of this feature?
> Remove unnecessary cast in query
> --------------------------------
>
> Key: IMPALA-10969
> URL: https://issues.apache.org/jira/browse/IMPALA-10969
> Project: IMPALA
> Issue Type: Improvement
> Components: Frontend
> Affects Versions: Impala 4.0.0
> Reporter: Sheng Wang
> Priority: Minor
>
> In some queries, cast target data type is same as column origin data type. We
> can remove these unnecessary cast by adding a new expr rewrite rule. There
> are two benefits:
> # For non partition columns, remove these unnecessary cast will improve
> query performance;
> # If we visit kudu table, predicates with cast cannot push down to Kudu
> side, such as 'cast(a as int) > 100', but ' a > 100' can push down to kudu
> side. We can remove this cast if a is INT type.
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