Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/2961#discussion_r91738368
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/table.scala
---
@@ -881,24 +883,21 @@ class GroupWindowedTable(
* }}}
*/
def select(fields: Expression*): Table = {
--- End diff --
At the moment there is no way to specify watermarks inside of a Table API
or SQL query. This can only be done on a DataStream before it is converted into
a Table. Therefore, watermarks and timestamps are already assigned before the
first Table or SQL operator can remove anything. In case of a TableSource which
assigns timestamps, the TableSource needs to take care that the assignment
happens before a pushed-down projection is applied.
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