Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21745#discussion_r202054901
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -1151,10 +1152,17 @@ class Analyzer(
}
}
+ /**
+ * This method tries to resolve expressions and find missing
attributes recursively. Specially,
+ * when the expressions used in `Sort` or `Filter` contain unresolved
attributes or resolved
+ * attributes which are missed from SELECT clause. This method tries
to find the missing
--- End diff --
`which are missed from child output`
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