peter-toth commented on a change in pull request #27675: [SPARK-30870][SQL]
Column pruning shouldn't alias a nested column if it means the whole structure
URL: https://github.com/apache/spark/pull/27675#discussion_r383460910
##########
File path:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/NestedColumnAliasingSuite.scala
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@@ -215,12 +215,7 @@ class NestedColumnAliasingSuite extends SchemaPruningTest
{
val optimized = Optimize.execute(query)
- val expected = nestedRelation
- .select(GetStructField('a, 0, Some("b")))
- .limit(5)
- .analyze
-
- comparePlans(optimized, expected)
+ comparePlans(optimized, query)
Review comment:
@dongjoon-hyun hmm, does this test have anything to do with limit push down?
There is no `LimitPushDown` in the optimizer of this suite:
https://github.com/apache/spark/blob/5a51b9472f5dfbf99ef6f8d6c7151618157c446e/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/NestedColumnAliasingSuite.scala#L34-L39
and actually `limit` is closer to the relation in the original `query` than in
`expected`, but I might be wrong.
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