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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