Github user dongjoon-hyun commented on a diff in the pull request: https://github.com/apache/spark/pull/14355#discussion_r72917596 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala --- @@ -280,6 +267,32 @@ trait CheckAnalysis extends PredicateHelper { case p if p.expressions.exists(PredicateSubquery.hasPredicateSubquery) => failAnalysis(s"Predicate sub-queries can only be used in a Filter: $p") + case _: Union | _: SetOperation if operator.children.length > 1 => + def dataTypes(plan: LogicalPlan): Seq[DataType] = plan.output.map(_.dataType) + def ordinalTable(i: Int): String = (if (i == 0) "second" else (i + 2) + "th") + " table" + val ref = dataTypes(operator.children.head) + operator.children.tail.zipWithIndex.foreach { case (child, ti) => + // Check the number of columns + if (child.output.length != ref.length) { + failAnalysis( + s""" + |${operator.nodeName} can only be performed on tables with the same number + |of columns, but the first table has ${ref.length} columns and + |the ${ordinalTable(ti)} has ${child.output.length} columns + """.stripMargin.replace("\n", " ").trim()) + } + // Check if the data types match. + dataTypes(child).zip(ref).zipWithIndex.foreach { case ((dt1, dt2), ci) => + if (dt1 != dt2) { + failAnalysis( + s""" + |${operator.nodeName} can only be performed on tables with the compatible + |column types. $dt1 <> $dt2 at ${ci + 1}th column of ${ordinalTable(ti)} --- End diff -- Oh, I see. Thank you. I'll fix it.
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