Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/4279#discussion_r126617388
--- Diff: docs/dev/table/tableApi.md ---
@@ -373,7 +373,7 @@ Table result = orders
<tr>
<td>
<strong>Distinct</strong><br>
- <span class="label label-primary">Batch</span>
+ <span class="label label-primary">Batch</span> <span class="label
label-primary">Streaming</span>
--- End diff --
If the input is append/insert only, distinct will only produce insert
changes as well.
However, I don't think we make this distinction in the decoration phase.
AFAIK, it will always be marked to produce updates right now.
IMO, it would be good if DISTINCT on append-only input would not be treated
as producing updates. We don't have to fix it in this PR, but I think it would
be good to make such a change. What do you think @wuchong?
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