wuchong 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_r336310564
##########
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:
I prefer `containsPythonFunction()` and `containsNonPythonFunction`, because
it's more clear than `findPythonFunction = false` flag. Meanwhile, I think
`recursive` is also not a very clear flag. I think "contains" already means any
node matched in the tree. So I would suggest following utils:
```
boolean containsPythonCall(RexNode)
boolean containsNonPythonCall(RexNode)
boolean isPythonCall(RexNode)
boolean isNonPythonCall(RexNode)
```
This also follows `RexUtil.isConstant(RexNode)` and
`RexUtil.containsFieldAccess(RexNode)`
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