Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3269#discussion_r103918266
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/rules/util/RexProgramProjectExtractor.scala
---
@@ -84,6 +108,49 @@ object RexProgramProjectExtractor {
}
/**
+ * A RexVisitor to extract used nested input fields
+ */
+class RefFieldAccessorVisitor(
+ names: List[String],
+ usedFields: Array[Int]) extends RexVisitorImpl[Unit](true) {
+
+ private val projectedFields = new util.ArrayList[Array[String]]
+
+ names.foreach { n =>
+ projectedFields.add(Array.empty)
+ }
+
+ private val order: Map[Int, Int] =
names.indices.zip(usedFields).map(_.swap).toMap
--- End diff --
`names` and `usedFields` might not have the same length.
The result of `zip` has the length of the smaller of both lists which is
not intended here, right?
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