godfreyhe commented on a change in pull request #17670:
URL: https://github.com/apache/flink/pull/17670#discussion_r754793897
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File path: docs/content.zh/docs/dev/table/sql/queries/window-agg.md
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@@ -40,7 +40,9 @@ Unlike other aggregations on continuous tables, window
aggregation do not emit i
### Windowing TVFs
-Flink supports `TUMBLE`, `HOP` and `CUMULATE` types of window aggregations,
which can be defined on either [event or processing time attributes]({{< ref
"docs/dev/table/concepts/time_attributes" >}}). See [Windowing TVF]({{< ref
"docs/dev/table/sql/queries/window-tvf" >}}) for more windowing functions
information.
+Flink supports `TUMBLE`, `HOP` and `CUMULATE` types of window aggregations.
+For SQL queries on streaming tables, the time attribute field of a window
table-valued function must be on either [event or processing time
attributes]({{< ref "docs/dev/table/concepts/time_attributes" >}}). See
[Windowing TVF]({{< ref "docs/dev/table/sql/queries/window-tvf" >}}) for more
windowing functions information.
+For SQL on batch tables, the time attribute field of a window table-valued
function must be an attribute of type `TIMESTAMP` or `TIMESTAMP_LTZ`.
Review comment:
+1 for streaming/batch mode
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