Github user lincoln-lil commented on a diff in the pull request:
https://github.com/apache/flink/pull/3733#discussion_r111959451
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/GroupAggProcessFunction.scala
---
@@ -68,12 +70,35 @@ class GroupAggProcessFunction(
var accumulators = state.value()
if (null == accumulators) {
+ previous = null
accumulators = new Row(aggregates.length)
i = 0
while (i < aggregates.length) {
accumulators.setField(i, aggregates(i).createAccumulator())
i += 1
}
+ } else {
+ // get previous row
+ if (generateRetraction) {
+ if (null == previous) {
+ previous = new Row(groupings.length + aggregates.length)
+ // previous is used to output retract message, so command of
previous will always be
+ // Command.Delete
+ previous.command = Command.Delete
+ }
+ i = 0
+ while (i < groupings.length) {
+ previous.setField(i, input.getField(groupings(i)))
+ i += 1
+ }
+ i = 0
+ while (i < aggregates.length) {
+ val index = groupings.length + i
--- End diff --
reduce a local variable:
previous.setField(groupings.length + i, aggregates(i).getValue(accumulator))
also L118 and L127
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