Github user wuchong commented on a diff in the pull request: https://github.com/apache/flink/pull/3829#discussion_r136362552 --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/BatchTableEnvironment.scala --- @@ -106,6 +106,43 @@ abstract class BatchTableEnvironment( } /** + * Registers an external [[TableSink]] in this [[TableEnvironment]]'s catalog. + * Registered sink tables can be referenced in SQL DML clause. + * + * Examples: + * + * - predefine a table sink with schema --- End diff -- I think a pre-registered table sink should contain its own schema information, so I prefer `registerTableSink(String, TableSink)` interface. If we register a table sink without schema in it, we can throw an exception.
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