Gabriel39 commented on code in PR #12059:
URL: https://github.com/apache/doris/pull/12059#discussion_r954425879
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docs/en/docs/sql-manual/sql-functions/window-functions/WINDOW-FUNCTION-WINDOW-FUNNEL.md:
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@@ -0,0 +1,62 @@
+---
+{
+ "title": "WINDOW-FUNCTION-WINDOW_FUNNEL",
+ "language": "en"
+}
+---
+
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+
+ http://www.apache.org/licenses/LICENSE-2.0
+
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+
+## WINDOW FUNCTION WINDOW_FUNNEL
+### description
+
+Searches the longest event chain happened in order (event1, event2, ... ,
eventN) along the timestamp_column with length of window.
+
+- window is the length of time window in seconds.
+- mode is reserved for future, not used for now.
+- timestamp_column specifies column of DATE or DATETIME type.
Review Comment:
I think we should change `timestamp_column` to only DATETIME type because
the granularity of time window is second now
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