Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/15857#discussion_r87934920 --- Diff: sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/FoldablePropagationSuite.scala --- @@ -118,14 +118,30 @@ class FoldablePropagationSuite extends PlanTest { Seq( testRelation.select(Literal(1).as('x), 'a).select('x + 'a), testRelation.select(Literal(2).as('x), 'a).select('x + 'a))) - .select('x) val optimized = Optimize.execute(query.analyze) val correctAnswer = Union( Seq( testRelation.select(Literal(1).as('x), 'a).select((Literal(1).as('x) + 'a).as("(x + a)")), testRelation.select(Literal(2).as('x), 'a).select((Literal(2).as('x) + 'a).as("(x + a)")))) - .select('x).analyze --- End diff -- We are not checking whether it is resolvable or not. See the PR https://github.com/apache/spark/pull/15417
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