danny0405 commented on a change in pull request #13577:
URL: https://github.com/apache/flink/pull/13577#discussion_r505288730
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File path:
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/planner/plan/utils/FlinkRexUtil.scala
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@@ -343,6 +344,54 @@ object FlinkRexUtil {
}
})
+ /**
+ * Returns whether a given tree contains any {@link RexInputRef} nodes
+ * with given indices.
+ *
+ * @param node a RexNode tree
+ */
+ def containsInputRef(node: RexNode, refs: JSet[Integer]): Boolean = try {
+ val visitor = new RexVisitorImpl[Void](true) {
+ override def visitInputRef(inputRef: RexInputRef): Void = {
+ if (refs.contains(inputRef.getIndex)) {
+ throw new Util.FoundOne(inputRef)
+ }
+ null
+ }
+ }
+ node.accept(visitor)
+ false
+ } catch {
+ case e: Util.FoundOne =>
+ Util.swallow(e, null)
+ true
+ }
Review comment:
It is used by the following PR, i can remove it now ~
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