Github user dilipbiswal commented on a diff in the pull request:
https://github.com/apache/spark/pull/17713#discussion_r112819365
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala
---
@@ -414,4 +352,269 @@ trait CheckAnalysis extends PredicateHelper {
plan.foreach(_.setAnalyzed())
}
+
--- End diff --
note to reviewers: This function basically refactors the validation logic
for subquery expressions from checkAnalysis. This is the entry point function
to do all the validation for subquery is is called from checkAnalysis().
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