Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/3712
Yes, I think that would work well. We could provide a builder for the table
source and forward calls to the `JDBCOutputFormatBuilder`.
Regarding the query template: we can also make it an optional parameter to
override the standard `INSERT INTO ... VALUES` template if set.
If you want the source to support upsert writes you might want to implement
the `UpsertStreamTableSink` rather than the `AppendStreamTableSink`. The
`UpsertStreamTableSink` supports append writes as well as updates and deletes
by exposing the unique key fields of a `Table`.
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