Github user KurtYoung commented on a diff in the pull request:
https://github.com/apache/flink/pull/2961#discussion_r91729382
--- 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 --
What if user use a customized watermark extracter which used some fields
from the element. For example, we have original table source containing 4
fields: a, b, c, d. And user used "a" field to extract the timestamp and
watermark. But in the later query on the table, only "b" and "c" are used. And
if we do a projection on "b" and "c", and the projection is pushed into table
source further, we will not get field "a" which used to produce timestamp
anymore.
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