Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/4138#discussion_r123946049
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/CodeGenerator.scala
---
@@ -1560,6 +1561,13 @@ class CodeGenerator(
requireArray(array)
generateArrayElement(this, array)
+ case ScalarSqlFunctions.CONCAT | ScalarSqlFunctions.CONCAT_WS =>
+ this.config.setNullCheck(false)
--- End diff --
We cannot modify the config here. Maybe it makes sense not to use a
`CallGenerator` but add the logic to `ScalarOperators`. Other arrays functions
such as `generateArrayCardinality`, `generateArrayElement` are there as well.
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