jihoonson commented on a change in pull request #11157:
URL: https://github.com/apache/druid/pull/11157#discussion_r625514785
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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:
Sounds good 👍
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