Github user wuchong commented on a diff in the pull request:
https://github.com/apache/flink/pull/3330#discussion_r101456205
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/CodeGenerator.scala
---
@@ -1463,21 +1465,23 @@ class CodeGenerator(
*/
def addReusableFunction(function: UserDefinedFunction): String = {
val classQualifier = function.getClass.getCanonicalName
- val fieldTerm = s"function_${classQualifier.replace('.', '$')}"
+ val functionSerializedData = serialize(function)
+ val fieldTerm =
+ s"""
+ |function_${classQualifier.replace('.',
'$')}_${DigestUtils.md5Hex(functionSerializedData)}
--- End diff --
Yes, UDTF node is independent of the codegen. It rarely happens in UDTF.
But often happens when involving multiple ScalarFucntions (assuming the same
way to implement ScalarFunction).
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