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docs: Adding admonition box to warn about MVD (#16712) 

Co-authored-by: Victoria Lim <vtlim@users.noreply.github.com>
Co-authored-by: Benedict Jin <asdf2014@apache.org>
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Edgar Melendrez 2024-07-22 17:32:23 -07:00 committed by GitHub
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docs/querying/lookups.md
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@ -50,6 +50,10 @@ Other lookup types are available as extensions, including:
- Globally cached lookups from local files, remote URIs, or JDBC through [lookups-cached-global](./lookups-cached-global.md).
- Globally cached lookups from a Kafka topic through [kafka-extraction-namespace](./kafka-extraction-namespace.md).
:::info
[Multi-value dimensions](multi-value-dimensions.md) (MVDs) are not supported as keys in lookups. For example, to map the MVD `["A", "B", "C"]` to the value `x` in your lookup, flatten the MVD and map each element of the MVD to the value. Your lookup will have separate key-value pairs for each element of the MVD: `"A": "x"`, `"B": "x"`, and `"C": "x"`.
:::
Query Syntax
------------