cloud-fan commented on a change in pull request #30144:
URL: https://github.com/apache/spark/pull/30144#discussion_r610459759
##########
File path: docs/sql-ref-syntax-qry-select-groupby.md
##########
@@ -93,6 +95,38 @@ 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`.
+* **Partial Grouping Analytics**
+
+ Partial grouping analytics means there are both `group_expression` and
`CUBE|ROLLUP|GROUPING SETS`
+ in GROUP BY clause. `CUBE` and `ROLLUP` are just syntax sugar for GROUPING
SETS, for how to use
+ `CUBE` and `ROLLUP` can refer to the section above about `CUBE` and
`ROLLUP`. For example:
+ `GROUP BY warehouse, GROUPING SETS((product, location), (product),
(location), ())` is equivalent to
+ `GROUP BY GROUPING SETS((warehouse, product, location), (warehouse,
product), (warehouse, location), (warehouse))`.
+ `GROUP BY warehouse, GROUPING SETS((product, location), (producet), ())`
is equivalent to
+ `GROUP BY GROUPING SETS((warehouse, product, location), (warehouse,
location), (warehouse))`.
+
+* **Concatenated Grouping Analytics**
Review comment:
I think we can combine these 2 new sections:
```
* **Mixed Grouping Analytics**
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
a single `GROUPING SETS` by doing a cross-product of the original `GROUPING
SETS`s. For example, ...
```
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
