Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/17100#discussion_r146121917
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala
---
@@ -270,12 +273,25 @@ trait CheckAnalysis extends PredicateHelper {
operator match {
case o if o.children.nonEmpty && o.missingInput.nonEmpty =>
+ val resolver = conf.resolver
+ val commonAttrs = o.missingInput.filter(x =>
+ o.inputSet.exists(y => resolver(x.name, y.name)))
val missingAttributes = o.missingInput.mkString(",")
- val input = o.inputSet.mkString(",")
+ val availableAttributes = o.inputSet.mkString(",")
+ val repeatedNameHint = if (commonAttrs.size > 0) {
+ val commonNames = commonAttrs.map(_.name).mkString(",")
+ s"""\n|Observe that attribute(s) $commonNames appear in two
--- End diff --
The new line `\n` is intentional?
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