Github user wuchong commented on a diff in the pull request:
https://github.com/apache/flink/pull/2182#discussion_r68969768
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/codegen/calls/CallGenerator.scala
---
@@ -43,11 +43,16 @@ object CallGenerator {
val nullTerm = newName("isNull")
val resultTypeTerm = primitiveTypeTermForTypeInfo(returnType)
val defaultValue = primitiveDefaultValue(returnType)
+ val nullCheckTerms = if(operands.size > 0) {
+ operands.map(_.nullTerm).mkString(" || ")
+ } else {
+ nullCheck + ""
+ }
--- End diff --
It seems that when operands.size == 0 and nullCheck is enable, the
`$nullTerm` will always be true, which means `$resultTerm` always be the
default value. That may be wrong.
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