cloud-fan commented on a change in pull request #24442: [SPARK-27547][SQL] fix
DataFrame self-join problems
URL: https://github.com/apache/spark/pull/24442#discussion_r277692238
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File path: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala
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@@ -2300,11 +2346,16 @@ class Dataset[T] private[sql](
u.name, sparkSession.sessionState.analyzer.resolver).getOrElse(u)
case Column(expr: Expression) => expr
}
- val attrs = this.logicalPlan.output
- val colsAfterDrop = attrs.filter { attr =>
- attr != expression
Review comment:
`drop` should not match attribute by equality. We should use
`semanticEquals`.
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