cryptoe commented on a change in pull request #12253:
URL: https://github.com/apache/druid/pull/12253#discussion_r806136177
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File path: docs/querying/multi-value-dimensions.md
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@@ -375,3 +375,8 @@ This query returns the following result:
Note that, for groupBy queries, you could get similar result with a [having
spec](having.md) but using a filtered
`dimensionSpec` is much more efficient because that gets applied at the lowest
level in the query processing pipeline.
Having specs are applied at the outermost level of groupBy query processing.
+
+## Disable GroupBy on multivalue columns
+
+As grouping on multivalue columns causes implicit unnest, users can avoid this
behaviour by setting
+`groupByEnableMultiValueUnnesting` in the query context to `false`. This will
result the query to error out.
Review comment:
In the latest draft I have kept the documentation and changed the error
messaging a bit.
Update the "GroupBy v2 configurations" as well.
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