Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/22749#discussion_r227681844 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala --- @@ -1087,7 +1087,7 @@ class Dataset[T] private[sql]( // Note that we do this before joining them, to enable the join operator to return null for one // side, in cases like outer-join. val left = { - val combined = if (this.exprEnc.flat) { + val combined = if (!this.exprEnc.objSerializer.dataType.isInstanceOf[StructType]) { --- End diff -- shall we create a method in `ExpressionEncoder` for this check?
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