Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/17100#discussion_r146121901 --- 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 -- I'm not sure if this is always the case. Some failures in the query plan analysis can cause missing attributes, I mean.
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