Liang-Chi Hsieh created SPARK-21134:
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Summary: Codegen-only expressions should not be collapsed with
upper CodegenFallback expression
Key: SPARK-21134
URL: https://issues.apache.org/jira/browse/SPARK-21134
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.1.1
Reporter: Liang-Chi Hsieh
The rule {{CollapseProject}} in optimizer collapses lower and upper expressions
if they have common expressions.
We have seen a use case that a codegen-only expression has been collapsed with
an upper {{CodegenFallback}} expression. Because all children expressions under
{{CodegenFallback}} will be evaluated with non-codegen path {{eval}}, it causes
an exception in runtime.
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