hequn8128 commented on a change in pull request #9865: [FLINK-14212][python] 
Support no-argument Python UDFs.
URL: https://github.com/apache/flink/pull/9865#discussion_r333842540
 
 

 ##########
 File path: 
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/planner/codegen/ExpressionReducer.scala
 ##########
 @@ -62,6 +63,9 @@ class ExpressionReducer(
 
     val literals = constExprs.asScala.map(e => (e.getType.getSqlTypeName, 
e)).flatMap {
 
+      // skip expressions that contain python functions
 
 Review comment:
   Maybe it's better to be more specific that why we skip python functions. 

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