[GitHub] [flink] beyond1920 commented on a change in pull request #17651: [FLINK-24656][docs] Add documentation for window deduplication
beyond1920 commented on a change in pull request #17651:
URL: https://github.com/apache/flink/pull/17651#discussion_r745333651
##
File path: docs/content.zh/docs/dev/table/sql/queries/window-deduplication.md
##
@@ -0,0 +1,93 @@
+---
+title: "窗口去重"
+weight: 16
+type: docs
+---
+
+
+# Window Deduplication
+{{< label Batch >}} {{< label Streaming >}}
+
+Window Deduplication is a special [Deduplication]({{< ref
"docs/dev/table/sql/queries/deduplication" >}}) which removes rows that
duplicate over a set of columns, keeping only the first one or the last one for
each window and other partitioned keys.
+
+For streaming queries, unlike regular Deduplicate on continuous tables, window
Deduplication does not emit intermediate results but only a final result at the
end of the window. Moreover, window Deduplication purges all intermediate state
when no longer needed.
+Therefore, window Deduplication queries have better performance if users don't
need results updated per record. Usually, Window Deduplication is used with
[Windowing TVF]({{< ref "docs/dev/table/sql/queries/window-tvf" >}}) directly.
Besides, Window Deduplication could be used with other operations based on
[Windowing TVF]({{< ref "docs/dev/table/sql/queries/window-tvf" >}}), such as
[Window Aggregation]({{< ref "docs/dev/table/sql/queries/window-agg" >}}),
[Window TopN]({{< ref "docs/dev/table/sql/queries/window-topn">}}) and [Window
Join]({{< ref "docs/dev/table/sql/queries/window-join">}}).
+
+Window Deduplication can be defined in the same syntax as regular
Deduplication, see [Deduplication documentation]({{< ref
"docs/dev/table/sql/queries/deduplication" >}}) for more information.
+Besides that, Window Deduplication requires the `PARTITION BY` clause contains
`window_start` and `window_end` columns of the relation applied [Windowing
TVF]({{< ref "docs/dev/table/sql/queries/window-tvf" >}}) or [Window
Aggregation]({{< ref "docs/dev/table/sql/queries/window-agg" >}}).
Review comment:
All window TVF operations are allowed
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[GitHub] [flink] beyond1920 commented on a change in pull request #17651: [FLINK-24656][docs] Add documentation for window deduplication
beyond1920 commented on a change in pull request #17651:
URL: https://github.com/apache/flink/pull/17651#discussion_r745332586
##
File path: docs/content.zh/docs/dev/table/sql/queries/window-deduplication.md
##
@@ -0,0 +1,93 @@
+---
+title: "窗口去重"
+weight: 16
+type: docs
+---
+
+
+# Window Deduplication
+{{< label Batch >}} {{< label Streaming >}}
+
+Window Deduplication is a special [Deduplication]({{< ref
"docs/dev/table/sql/queries/deduplication" >}}) which removes rows that
duplicate over a set of columns, keeping only the first one or the last one for
each window and other partitioned keys.
+
+For streaming queries, unlike regular Deduplicate on continuous tables, window
Deduplication does not emit intermediate results but only a final result at the
end of the window. Moreover, window Deduplication purges all intermediate state
when no longer needed.
+Therefore, window Deduplication queries have better performance if users don't
need results updated per record. Usually, Window Deduplication is used with
[Windowing TVF]({{< ref "docs/dev/table/sql/queries/window-tvf" >}}) directly.
Besides, Window Deduplication could be used with other operations based on
[Windowing TVF]({{< ref "docs/dev/table/sql/queries/window-tvf" >}}), such as
[Window Aggregation]({{< ref "docs/dev/table/sql/queries/window-agg" >}}),
[Window TopN]({{< ref "docs/dev/table/sql/queries/window-topn">}}) and [Window
Join]({{< ref "docs/dev/table/sql/queries/window-join">}}).
Review comment:
not yet
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[GitHub] [flink] beyond1920 commented on a change in pull request #17651: [FLINK-24656][docs] Add documentation for window deduplication
beyond1920 commented on a change in pull request #17651:
URL: https://github.com/apache/flink/pull/17651#discussion_r745330897
##
File path: docs/content.zh/docs/dev/table/sql/queries/window-deduplication.md
##
@@ -0,0 +1,93 @@
+---
+title: "窗口去重"
+weight: 16
+type: docs
+---
+
+
+# Window Deduplication
+{{< label Batch >}} {{< label Streaming >}}
Review comment:
Batch would be supported soon in
[PR](https://github.com/apache/flink/pull/17666) and
[PR](https://github.com/apache/flink/pull/17670).
I mark it to be only streaming currently.
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