cloud-fan commented on a change in pull request #35079:
URL: https://github.com/apache/spark/pull/35079#discussion_r778070618
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File path: docs/sql-ref-syntax-qry-select-window.md
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@@ -42,14 +42,24 @@ window_function OVER
* Analytic Functions
- **Syntax:** `CUME_DIST | LAG | LEAD`
+ **Syntax:** `CUME_DIST | LAG | LEAD | NTH_VALUE | FIRST_VALUE |
LAST_VALUE`
* Aggregate Functions
**Syntax:** `MAX | MIN | COUNT | SUM | AVG | ...`
Please refer to the [Built-in Aggregation
Functions](sql-ref-functions-builtin.html#aggregate-functions) document for a
complete list of Spark aggregate functions.
+* **nulls_option**
+
+ Specified to indicate whether skip null values in the determination of
which row to use. `RESPECT NULLS` is supported by default if you do not specify
`IGNORE NULLS`.
+
+ **Syntax:**
+
+ `{ IGNORE | RESPECT } NULLS`
+
+ **Note:** Only `LAG | LEAD | NTH_VALUE | FIRST_VALUE | LAST_VALUE` could
append `{ IGNORE | RESPECT } NULLS`.
Review comment:
```suggestion
**Note:** Only `LAG | LEAD | NTH_VALUE | FIRST_VALUE | LAST_VALUE` can
be used with `IGNORE NULLS`.
```
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