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docs: Clarify error behavior of subscript operator and suggest element_at alternative #21329

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Apr 3, 2024
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docs: Clarify error behavior of subscript operator and suggest element_at alternative #21329

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4 changes: 3 additions & 1 deletion docs/src/main/sphinx/functions/map.md
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## Subscript operator: \[\]

The `[]` operator is used to retrieve the value corresponding to a given key from a map:
The `[]` operator is used to retrieve the value corresponding to a given key from a map.
This operator throws an error if the key is not contained in the map.
See also `element_at` function that returns `NULL` in such case.

```
SELECT name_to_age_map['Bob'] AS bob_age;
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