[GitHub] [druid] gianm commented on a change in pull request #10518: Add grouping_id function

[GitBox <gi...@apache.org>]

gianm commented on a change in pull request #10518:
URL: https://github.com/apache/druid/pull/10518#discussion_r538594174



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File path: docs/querying/sql.md
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@@ -337,6 +338,7 @@ Only the COUNT aggregation can accept DISTINCT.
 |`LATEST(expr, maxBytesPerString)`|Like `LATEST(expr)`, but for strings. The `maxBytesPerString` parameter determines how much aggregation space to allocate per string. Strings longer than this limit will be truncated. This parameter should be set as low as possible, since high values will lead to wasted memory.|
 |`ANY_VALUE(expr)`|Returns any value of `expr` including null. `expr` must be numeric. This aggregator can simplify and optimize the performance by returning the first encountered value (including null)|
 |`ANY_VALUE(expr, maxBytesPerString)`|Like `ANY_VALUE(expr)`, but for strings. The `maxBytesPerString` parameter determines how much aggregation space to allocate per string. Strings longer than this limit will be truncated. This parameter should be set as low as possible, since high values will lead to wasted memory.|
+|`GROUPING(expr, expr...)`|Returns a number to indicate which groupBy dimension is included in a row, when using `GROUPING SETS`. Refer to [additional documentation](aggregations.md#Grouping Aggregator) on how to infer this number.|

Review comment:
       @abhishekagarwal87 I don't think this anchor will work (our doc generators don't include spaces in anchors). Could you please double-check it?




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