cloud-fan commented on a change in pull request #33142:
URL: https://github.com/apache/spark/pull/33142#discussion_r660906173
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File path:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/SubexpressionEliminationSuite.scala
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@@ -315,15 +311,17 @@ class SubexpressionEliminationSuite extends SparkFunSuite
with ExpressionEvalHel
val add1 = Add(Literal(1), Literal(2))
val add2 = Add(Literal(2), Literal(3))
val add3 = Add(add1, add2)
- val condition = (GreaterThan(add3, Literal(3)), add3) :: Nil
+ val condition = (Literal(true), add3) :: Nil
Review comment:
This is a long-standing issue, discussed in
https://github.com/apache/spark/pull/32559/files#r633911273
If the condition is `GreaterThan(add3, Literal(3)`, then `add1` and `add2`
will be treated as common subexpressions, similar to
https://github.com/apache/spark/pull/33142/files#diff-27f45b563969445dc46c8586c8f45c59cd1a583d400bc69457ea6f2e3c94f202R178
This is because the first condition of `CaseWhen` is part of
`childrenToRecurse`
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