[GitHub] flink pull request #2182: [Flink-4130] CallGenerator could generate illegal ...

[wuchong <gi...@git.apache.org>]

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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