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Posted to issues@impala.apache.org by "Sheng Wang (Jira)" <ji...@apache.org> on 2021/10/14 02:32:00 UTC

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

Sheng Wang created IMPALA-10969:
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             Summary: 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


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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