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Posted to issues@impala.apache.org by "Quanlong Huang (Jira)" <ji...@apache.org> on 2021/10/14 06:29:00 UTC

[jira] [Resolved] (IMPALA-10969) Remove unnecessary cast in query

     [ https://issues.apache.org/jira/browse/IMPALA-10969?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Quanlong Huang resolved IMPALA-10969.
-------------------------------------
    Resolution: Duplicate

Thanks for reporting this! I think this duplicates IMPALA-10836. We can discuss there.

> 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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