Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/6264#discussion_r201309003
--- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/sources/DefinedFieldMapping.scala
---
@@ -50,7 +50,8 @@ trait DefinedFieldMapping {
* type. It can also provide a mapping for fields which are not in the [[TableSchema]]
to make
* fields in the physical [[TypeInformation]] accessible for a [[TimestampExtractor]].
*
- * @return A mapping from [[TableSchema]] fields to [[TypeInformation]] fields.
+ * @return A mapping from [[TableSchema]] fields to [[TypeInformation]] fields or
--- End diff --
This is public API that we cannot change easily. I think the reason why Fabian chose null
here is also for interoperability between Scala and Java.
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