Github user Xpray commented on a diff in the pull request:
https://github.com/apache/flink/pull/5988#discussion_r187636169
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/calls/CallGenerator.scala
---
@@ -64,17 +65,28 @@ object CallGenerator {
val (auxiliaryStmt, result) = call(operands.map(_.resultTerm))
+ val nullTermCode = if (
+ nullCheck &&
+ isReference(returnType) &&
+ !TypeCheckUtils.isTemporal(returnType)) {
--- End diff --
In flink we use primitive types such as 'long' in code generation while
it's returnType is a time type with isReference is true, so I exclude it to
avoid these cases like
long a; if (a == null) {}
---
