Zoltan Haindrich created CALCITE-2848:
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Summary: Simplifying a case statement's first branch should
disregard its safety
Key: CALCITE-2848
URL: https://issues.apache.org/jira/browse/CALCITE-2848
Project: Calcite
Issue Type: Improvement
Reporter: Zoltan Haindrich
Assignee: Zoltan Haindrich
Example: a very simple CASE which is not get rewritten because the first
condition branch contains an unknown UDF
{code:sql}
CASE
WHEN to_date('2001-11-11') = '2000' THEN true
ELSE false
END
{code}
This expression right now retained as is; because the "to_date" was an unknown
UDF; but since the first branch of a CASE is always evaluated and that could
unlock the rewrite of this case to it's boolean form.
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