XiDuo You created SPARK-39106:
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Summary: Correct conditional expression constant folding
Key: SPARK-39106
URL: https://issues.apache.org/jira/browse/SPARK-39106
Project: Spark
Issue Type: Sub-task
Components: SQL
Affects Versions: 3.4.0
Reporter: XiDuo You
For a conditional expression, we can not partially fold the constant inside
it's children. For example if c1 or c2 is not null, the last branch should be
never hit.
{code:java}
SELECT COALESCE(c1, c2, 1/0);
{code}
Besides, for CaseWhen and If, we should mark it as foldable if it's children
are foldable. It is safe since the both non-codegen and codegen code path have
already respected the evaluation order.
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