Xianqing He created IMPALA-10836:
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Summary: 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
Fix For: Impala 4.1.0
For the function cast we can add the following optimizer:
#
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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