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Document nullability of map type #27182

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Document nullability of map type #27182

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3 changes: 2 additions & 1 deletion docs/src/main/sphinx/language/types.md
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Expand Up @@ -332,7 +332,8 @@ More information in [](/functions/array).
### `MAP`

A map between the given component types. A map is a collection of key-value
pairs, where each key is associated with a single value.
pairs, where each key is associated with a single value. Map keys are required,
while map values can be null.

Example: `MAP(ARRAY['foo', 'bar'], ARRAY[1, 2])`

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