Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/22713#discussion_r225103000
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/RemoveRedundantAliasAndProjectSuite.scala
---
@@ -124,4 +124,11 @@ class RemoveRedundantAliasAndProjectSuite extends
PlanTest with PredicateHelper
val expected = Subquery(relation.select('a as "a", 'b).where('b <
10).select('a).analyze)
comparePlans(optimized, expected)
}
+
+ test("SPARK-25691: RemoveRedundantProject works also with different
cases") {
+ val relation = LocalRelation('a.int, 'b.int)
+ val query = relation.select('A, 'b).analyzeCaseInsensitive
+ val optimized = Optimize.execute(query)
+ comparePlans(optimized, relation)
--- End diff --
Spark can be case-sensitive or not w.r.t. the config, but Spark should
always be case-preserving.
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