Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1798#discussion_r56312918
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/plan/nodes/dataset/DataSetCalc.scala
---
@@ -66,8 +67,28 @@ class DataSetCalc(
super.explainTerms(pw).item("name", opName)
}
+ override def computeSelfCost (planner: RelOptPlanner): RelOptCost = {
+
+ val child = this.getInput
+ val rowCnt = RelMetadataQuery.getRowCount(child)
+ val exprCnt = calcProgram.getExprCount
+ planner.getCostFactory.makeCost(rowCnt, rowCnt * exprCnt, 0)
--- End diff --
Calc is implemented as `MapFunction` and will never spill to disk or cause
network traffic.
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