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_r279227348
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File path: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala
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@@ -1292,10 +1323,24 @@ class Dataset[T] private[sql](
colRegex(colName)
} else {
val expr = resolve(colName)
- Column(expr)
+ Column(addDataFrameIdToCol(expr))
Review comment:
Internally, I think we should never compare 2 attributes by `equal` not
`semanticEqual`.
Externally, if users rely on the equality of `Column`, yes this PR may break
it under some cases. If this matters, I can add a migration guide or update
`Column.equal`.
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