Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3735#discussion_r111994938
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/DataSetPreAggFunction.scala
---
@@ -64,38 +68,22 @@ class DataSetPreAggFunction(
def preaggregate(records: Iterable[Row], out: Collector[Row]): Unit = {
// create accumulators
- var i = 0
- while (i < aggregates.length) {
- accumulators(i) = aggregates(i).createAccumulator()
- i += 1
- }
+ accumulators = function.createAccumulators()
val iterator = records.iterator()
while (iterator.hasNext) {
val record = iterator.next()
--- End diff --
we can make `record` a `var` and move its definition outside of the loop.
Then we can get rid of the `if (!iterator.hasNext)` check in the body of
the while loop and set the `output` fields after the loop has terminated.
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