Github user beyond1920 commented on a diff in the pull request:
https://github.com/apache/flink/pull/2926#discussion_r91455098
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/plan/nodes/dataset/DataSetCalc.scala
---
@@ -73,7 +75,11 @@ class DataSetCalc(
val child = this.getInput
val rowCnt = metadata.getRowCount(child)
- val exprCnt = calcProgram.getExprCount
+
+ // compute number of non-field access expressions (computations,
conditions, etc.)
+ // we only want to account for computations, not for simple
projections.
+ val exprCnt =
calcProgram.getExprList.asScala.toList.count(!_.isInstanceOf[RexInputRef])
--- End diff --
maybe we could also exclude RexLiteral as well.
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