Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/5241#discussion_r160250511
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/AggregationCodeGenerator.scala
---
@@ -121,7 +121,7 @@ class AggregationCodeGenerator(
// get parameter lists for aggregation functions
val parametersCode = aggFields.map { inFields =>
- val fields = inFields.map { f =>
+ val fields = inFields.filter(index => index > -1).map { f =>
--- End diff --
`filter(index => index > -1)` can be shortend to `filter(_ > -1)`
---
