cloud-fan commented on a change in pull request #30144:
URL: https://github.com/apache/spark/pull/30144#discussion_r609766883
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File path: docs/sql-ref-syntax-qry-select-groupby.md
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@@ -93,6 +95,39 @@ 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. For example:
+ `GROUP BY warehouse, CUBE(product, location)` is equivalent to
Review comment:
the example can focus on GROUPING SETS. We can just say that ROLLUP/CUBE
is syntax sugar for GROUPING SETS and will be expanded to GROUPING SETS, then
apply the Partial Grouping Analytics semantic.
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