AngersZhuuuu commented on a change in pull request #32201:
URL: https://github.com/apache/spark/pull/32201#discussion_r615675314
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File path: docs/sql-ref-syntax-qry-select-groupby.md
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@@ -95,12 +95,13 @@ aggregate_name ( [ DISTINCT ] expression [ , ... ] ) [
FILTER ( WHERE boolean_ex
(product, warehouse, location), (warehouse), (product), (warehouse,
product), ())`.
The N elements of a `CUBE` specification results in 2^N `GROUPING SETS`.
-* **Mixed Grouping Analytics**
+* **Mixed/Nested Grouping Analytics**
- A GROUP BY clause can include multiple `group_expression`s and multiple
`CUBE|ROLLUP|GROUPING SETS`s.
+ A GROUP BY clause can include multiple `group_expression`s and multiple
`CUBE|ROLLUP|GROUPING SETS`s.
`CUBE|ROLLUP` is just a syntax sugar for `GROUPING SETS`, please refer to
the sections above for
how to translate `CUBE|ROLLUP` to `GROUPING SETS`. `group_expression` can
be treated as a single-group
- `GROUPING SETS` under this context. For multiple `GROUPING SETS` in the
`GROUP BY` clause, we generate
+ `GROUPING SETS` under this context. `GROUPING SETS` also support nested
grouping anlytics, Spark can support
+ use `CUBE|ROLLUP|GROUPING SETS` as `GROUPING SETS`'s `grouping_set`. For
multiple `GROUPING SETS` in the `GROUP BY` clause, we generate
Review comment:
How about current？
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