Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3520#discussion_r106140096
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/sources/ProjectableTableSource.scala
---
@@ -24,7 +24,7 @@ package org.apache.flink.table.sources
*
* @tparam T The return type of the [[ProjectableTableSource]].
*/
-trait ProjectableTableSource[T] {
+trait ProjectableTableSource[T] extends TableSource[T] {
--- End diff --
Why is this change necessary? A `ProjectableTableSource` always needs to
implement either `BatchTableSource` or `StreamTableSource` (or both) which
already implement `TableSource`.
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