Github user sunjincheng121 commented on a diff in the pull request: https://github.com/apache/flink/pull/3330#discussion_r101455043 --- 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_${classQualifier.replace('.', '$')}_${DigestUtils.md5Hex(functionSerializedData)} --- End diff -- 1. You write the above two functions are stateless, there is no problem when create a instanse . 2. In fact, we do not have to worried about the variable name, we build a tree, each UDTF node is independent of the codegen. Soï¼we can keep named the `fieldTerm = function_${classQualifier.replace('.', '$')}`.
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