Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/4488#discussion_r131714343
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/calls/ScalarOperators.scala
---
@@ -937,15 +935,40 @@ object ScalarOperators {
}
}
- def generateConcat(
- method: Method,
- operands: Seq[GeneratedExpression]): GeneratedExpression = {
+ def generateConcat(operands: Seq[GeneratedExpression]):
GeneratedExpression = {
- generateCallIfArgsNotNull(false, STRING_TYPE_INFO, operands) {
- (terms) =>s"${qualifyMethod(method)}(${terms.mkString(", ")})"
+ generateCallIfArgsNotNull(true, STRING_TYPE_INFO, operands) {
--- End diff --
the nullability should depend on the code generators nullability
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