cloud-fan commented on a change in pull request #24525: [SPARK-27633][SQL]
Remove redundant aliases in NestedColumnAliasing
URL: https://github.com/apache/spark/pull/24525#discussion_r285869987
##########
File path:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/NestedColumnAliasingSuite.scala
##########
@@ -221,6 +221,42 @@ class NestedColumnAliasingSuite extends SchemaPruningTest
{
comparePlans(optimized, expected)
}
+ test("Do not generate redundant aliases if parent nested field is aliased
too") {
+ val nestedRelation = LocalRelation('a.struct('b.struct('c.int,
+ 'd.struct('f.int, 'g.int), 'e.int)))
+
+ val first = GetStructField('a, 0, Some("b"))
Review comment:
can we use expression DSL to write tests?
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