AngersZhuuuu commented on a change in pull request #30212:
URL: https://github.com/apache/spark/pull/30212#discussion_r601173492
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File path: docs/sql-ref-syntax-qry-select-groupby.md
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@@ -50,34 +65,28 @@ aggregate_name ( [ DISTINCT ] expression [ , ... ] ) [
FILTER ( WHERE boolean_ex
is a shorthand for a `UNION ALL` where each leg of the `UNION ALL`
operator performs aggregation of subset of the columns specified in the
`GROUPING SETS` clause.
Review comment:
Should we explain more about `group by ()`, it mean's aggregate all
result.
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