[GitHub] [druid] clintropolis commented on a change in pull request #11157: ARRAY_AGG sql aggregator function

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

clintropolis commented on a change in pull request #11157:
URL: https://github.com/apache/druid/pull/11157#discussion_r625514097



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File path: docs/querying/sql.md
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@@ -353,6 +353,8 @@ Only the COUNT aggregation can accept DISTINCT.
 |`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.|
+|`ARRAY_AGG(expr, [size])`|Collects all values of `expr` into an ARRAY, including null values, with `size` in bytes limit on aggregation size (default of 1024 bytes). Use of `ORDER BY` within the `ARRAY_AGG` expression is not currently supported, and the ordering of results within the output array may vary depending on processing order.|

Review comment:
       :+1:, but I will do that in #11188, which adds that documentation for all aggregator functions




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