maropu commented on a change in pull request #28220: [SPARK-31390][SQL][DOCS]
Document Window Function in SQL Syntax Section
URL: https://github.com/apache/spark/pull/28220#discussion_r409210006
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File path: docs/sql-ref-syntax-qry-window.md
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@@ -19,4 +19,208 @@ license: |
limitations under the License.
---
-**This page is under construction**
+### Description
+
+Window functions operate on a group of rows, referred to as a window, and
calculate an aggregated value for each row based on the specified window.
Window functions are useful for processing tasks such as calculating a moving
average, computing a cumulative, or accessing the value of rows given the
relative position of the current row. Spark SQL supports three types of window
functions:
+
Review comment:
Thanks, it looks better. How about putting the last statement in a new
line?;
```
...the current row.
Spark SQL supports three types of window functions:
* Ranking Functions
* Analytic Functions
* Aggregate Functions
```
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