Kris Mok created SPARK-23760:
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Summary: CodegenContext.withSubExprEliminationExprs should
save/restore CSE state correctly
Key: SPARK-23760
URL: https://issues.apache.org/jira/browse/SPARK-23760
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.3.0, 2.2.1, 2.2.0
Reporter: Kris Mok
There's a bug in {{CodegenContext.withSubExprEliminationExprs()}} that makes it
effectively always clear the subexpression elimination state after it's called.
The original intent of this function was that it should save the old state, set
the given new state as current and perform codegen (invoke
{{Expression.genCode()}}), and at the end restore the subexpression elimination
state back to the old state. This ticket tracks a fix to actually implement the
original intent.
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