GuoPhilipse commented on a change in pull request #29056:
URL: https://github.com/apache/spark/pull/29056#discussion_r456728329
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File path: docs/sql-ref-syntax-qry-select-groupby.md
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@@ -91,6 +93,18 @@ aggregate_name ( [ DISTINCT ] expression [ , ... ] ) [
FILTER ( WHERE boolean_ex
Filters the input rows for which the `boolean_expression` in the `WHERE`
clause evaluates
to true are passed to the aggregate function; other rows are discarded.
+* **FIRST**
+
+ `FIRST` select a first expression value from the data set, we can specific
`IGNORE NULLS` to ignore NULLS, it is optional.
Review comment:
it seems your expression more natural. will improve it.
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