Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/10762#discussion_r51159429
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala
---
@@ -104,6 +105,9 @@ trait CheckAnalysis {
s"filter expression '${f.condition.prettyString}' " +
s"of type ${f.condition.dataType.simpleString} is not a
boolean.")
+ case j @ Join(_, _, NaturalJoin(_), _) =>
+ failAnalysis(s"natural join not resolved.")
--- End diff --
ok so this can happen - maybe we should print something more than just a
message to tell which natural join cannot be resolved?
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