hequn8128 commented on a change in pull request #9894: 
[FLINK-14342][table][python] Remove method FunctionDefinition#getLanguage.
URL: https://github.com/apache/flink/pull/9894#discussion_r337983696
 
 

 ##########
 File path: 
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/planner/codegen/ExpressionReducer.scala
 ##########
 @@ -68,7 +68,7 @@ class ExpressionReducer(
 
       // Skip expressions that contain python functions because it's quite 
expensive to
       // call Python UDFs during optimization phase. They will be optimized 
during the runtime.
-      case (_, e) if PythonUtil.containsFunctionOf(e, FunctionLanguage.PYTHON) 
=>
+      case (_, e) if PythonUtil.containsFunctionOf(e, findPythonFunction = 
true) =>
 
 Review comment:
   Thank you for your suggestions.

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