You are viewing a plain text version of this content. The canonical link for it is here.

Posted to issues-all@impala.apache.org by "Xianqing He (Jira)" <ji...@apache.org> on 2021/08/03 03:44:00 UTC

[jira] [Created] (IMPALA-10836) Add simplify cast rule

Xianqing He created IMPALA-10836:
------------------------------------

             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



--
This message was sent by Atlassian Jira
(v8.3.4#803005)

---------------------------------------------------------------------
To unsubscribe, e-mail: issues-all-unsubscribe@impala.apache.org
For additional commands, e-mail: issues-all-help@impala.apache.org