KurtYoung commented on a change in pull request #8110: [FLINK-12098]
[table-planner-blink] Add support for generating optimized logical plan for
simple group aggregate on stream
URL: https://github.com/apache/flink/pull/8110#discussion_r271998426
##########
File path:
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/plan/util/AggregateUtil.scala
##########
@@ -495,4 +497,65 @@ object AggregateUtil extends Enumeration {
}
(aggBufferNames ++ distinctBufferNames).toArray
}
+
+ /**
+ * Optimize max or min with retraction agg. MaxWithRetract can be optimized
to Max if input is
+ * update increasing.
+ */
+ def getNeedRetractions(
+ groupSize: Int,
+ needRetraction: Boolean,
+ aggs: Seq[AggregateCall]): Array[Boolean] = {
+
+ val needRetractionArray = Array.fill(aggs.size)(needRetraction)
+ // TODO supports RelModifiedMonotonicity
+
+ needRetractionArray
+ }
+
+ /**
+ * Derives output row type from local aggregate
+ */
+ def inferLocalAggRowType(
+ aggInfoList: AggregateInfoList,
+ inputRowType: RelDataType,
+ groupSet: Array[Int],
+ typeFactory: FlinkTypeFactory): RelDataType = {
+
Review comment:
delete blank line
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