MAP_FILTER

Filters key-value pairs in a JSON object based on a specified condition, defined using a lambda expression.

Syntax

MAP_FILTER(<json_object>, (<key>, <value>) -> <condition>)

Return Type

Returns a JSON object with only the key-value pairs that satisfy the specified condition.

Examples

This example extracts only the "status": "active" key-value pair from the JSON object, filtering out the other fields:

SELECT MAP_FILTER('{"status":"active", "user":"admin", "time":"2024-11-01"}'::VARIANT, (k, v) -> k = 'status') AS filtered_metadata;

┌─────────────────────┐
│  filtered_metadata  │
├─────────────────────┤
│ {"status":"active"} │
└─────────────────────┘