Github user wuchong commented on a diff in the pull request:
https://github.com/apache/flink/pull/2169#discussion_r68706865
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/plan/logical/operators.scala
---
@@ -236,6 +236,32 @@ case class Aggregate(
}
}
+case class SetMinus(left: LogicalNode, right: LogicalNode, all: Boolean)
extends BinaryNode {
+ override def output: Seq[Attribute] = left.output
+
+ override protected[logical] def construct(relBuilder: RelBuilder):
RelBuilder = {
+ left.construct(relBuilder)
+ right.construct(relBuilder)
+ relBuilder.minus(all)
+ }
+
+ override def validate(tableEnv: TableEnvironment): LogicalNode = {
+ val resolvedMinus = super.validate(tableEnv).asInstanceOf[SetMinus]
+ if (left.output.length != right.output.length) {
+ failValidation(s"Set minus two table of different column sizes:" +
+ s" ${left.output.size} and ${right.output.size}")
+ }
+ val sameSchema = left.output.zip(right.output).forall { case (l, r) =>
+ l.resultType == r.resultType && l.name == r.name }
--- End diff --
I think both tables must have the same number of fields with similar data
types, but they can accept different field names. e.g.
`testMinusDifferentFieldNames` should pass without no exception. Correct me if
I'm wrong.
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