Github user KurtYoung commented on a diff in the pull request:
https://github.com/apache/flink/pull/3520#discussion_r106328751
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/schema/TableSourceTable.scala
---
@@ -25,6 +25,7 @@ import org.apache.flink.table.sources.TableSource
/** Table which defines an external table via a [[TableSource]] */
class TableSourceTable[T](
val tableSource: TableSource[T],
+ val tableEnv: TableEnvironment,
--- End diff --
Yes, you are right, especially that UDF is currently registered as objects
but not classes, it's really impossible to let TableSource supporting this. I
will remove this filed and only use built-in functions when extracting
expression form RexProgram.
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