Github user rberenguel commented on a diff in the pull request:
https://github.com/apache/spark/pull/17100#discussion_r107354055
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala
---
@@ -337,11 +337,29 @@ trait CheckAnalysis extends PredicateHelper {
operator match {
case o if o.children.nonEmpty && o.missingInput.nonEmpty =>
val missingAttributes = o.missingInput.mkString(",")
- val input = o.inputSet.mkString(",")
+ val availableAttributes = o.inputSet.mkString(",")
+ val missingAttributesHelper = o.missingInput.map(a => (a.name,
a.exprId.id))
+
+ val availableAttributesHelper = o.inputSet.map(a => (a.name,
a.exprId.id))
+
+ val common = (missingAttributesHelper ++
availableAttributesHelper).groupBy(_._1)
+ val commonNames = common.map(x => (x._1, x._2.toSet))
+ .filter(_._2.size > 1)
+ .map(_._1)
+
+ val repeatedNameHint = if (commonNames.size > 0) {
+ s"\n|Observe that attribute(s) ${commonNames.mkString(",")}
appear in your " +
+ "query with at least two different hashes, but same name."
--- End diff --
Good point!
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