[GitHub] [spark] cloud-fan commented on a change in pull request #30144: [SPARK-33229][SQL] Support partial grouping analytics and concatenated grouping analytics

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cloud-fan commented on a change in pull request #30144:
URL: https://github.com/apache/spark/pull/30144#discussion_r604846862



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File path: docs/sql-ref-syntax-qry-select-groupby.md
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@@ -88,6 +89,41 @@ 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
+    `GROUP BY GROUPING SETS((warehouse, product, location), (warehouse, product), (warehouse, location), (warehouse))`.
+    `GROUP BY warehouse, ROLLUP(product, location)` is equivalent to
+    `GROUP BY GROUPING SETS((warehouse, product, location), (warehouse, product), (warehouse))`.
+    `GROUP BY warehouse, GROUPING SETS((product, location), (producet), ())` is equivalent to

Review comment:
       Is this a behavior change?




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