Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3269#discussion_r101755176
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/rules/util/RexProgramProjectExtractor.scala
---
@@ -84,6 +105,39 @@ object RexProgramProjectExtractor {
}
/**
+ * A RexVisitor to extract used nested input fields
+ */
+class RefFieldAccessorVisitor(
+ usedFields: Array[Int],
+ names: List[String])
+ extends RexVisitorImpl[Unit](true) {
+
+ private val group = usedFields.toList
+ private var nestedFields = mutable.LinkedHashSet[String]()
+
+ def getNestedFields: Array[String] = nestedFields.toArray
+
+ override def visitFieldAccess(fieldAccess: RexFieldAccess): Unit = {
+ fieldAccess.getReferenceExpr match {
+ case ref: RexInputRef =>
+ nestedFields +=
s"${names(ref.getIndex)}.${fieldAccess.getField.getName}"
--- End diff --
I think it would be nice, if we would go deeper than just one level.
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