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Update derivations.md with select JSON($flow_document) #1747

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Nov 1, 2024
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Update derivations.md with select JSON($flow_document) #1747

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4 changes: 4 additions & 0 deletions site/docs/concepts/derivations.md
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Expand Up @@ -218,6 +218,10 @@ into JSON arrays or objects and embeds them into the mapped document:
`{"greeting": "hello", "items": [1, "two", 3]}`.
If parsing fails, the raw string is used instead.

If you would like to select all columns of the input collection,
rather than `select *`, use `select JSON($flow_document)`, e.g.
`select JSON($flow_document where $status = open;`.

As a special case if your query selects a _single_ column
having a name that begins with `json` or `JSON`,
as is common when working with SQLite's [JSON functions](https://www.sqlite.org/json1.html),
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