gianm commented on code in PR #15245:
URL: https://github.com/apache/druid/pull/15245#discussion_r1372321243
##########
docs/multi-stage-query/concepts.md:
##########
@@ -192,10 +195,13 @@ To perform ingestion with rollup:
2. Set [`finalizeAggregations: false`](reference.md#context-parameters) in
your context. This causes aggregation
functions to write their internal state to the generated segments, instead
of the finalized end result, and enables
further aggregation at query time.
-3. Wrap all multi-value strings in `MV_TO_ARRAY(...)` and set
[`groupByEnableMultiValueUnnesting:
- false`](reference.md#context-parameters) in your context. This ensures that
multi-value strings are left alone and
- remain lists, instead of being [automatically
unnested](../querying/sql-data-types.md#multi-value-strings) by the
- `GROUP BY` operator.
+3. To ingest [Druid multi-value
dimensions](../querying/multi-value-dimensions.md), wrap all multi-value
strings
Review Comment:
This direction has become too complicated for people to understand, so I
think we'll need an example. Or to link to one.
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