danny0405 commented on a change in pull request #11340: [Flink 14338] Upgrade
Calcite version to 1.22 for Flink SQL
URL: https://github.com/apache/flink/pull/11340#discussion_r394773463
##########
File path:
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/planner/plan/rules/physical/batch/BatchExecWindowAggregateRule.scala
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@@ -156,6 +162,14 @@ class BatchExecWindowAggregateRule
// TODO aggregate include projection now, so do not provide new trait will
be safe
val aggProvidedTraitSet =
input.getTraitSet.replace(FlinkConventions.BATCH_PHYSICAL)
+
+ // Because of:
+ // [CALCITE-3763] RelBuilder.aggregate should prune unused fields from the
input,
+ // if the input is a Project.
+ //
+ // the field can not be pruned if it is referenced by other expressions
+ // of the window aggregation(i.e. the TUMBLE_START/END).
+ // To solve this, we config the RelBuilder to forbidden this feature.
Review comment:
I prefer to keep it to make the change more clear.
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