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Merge pull request #72652 from pakud/patch-2

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Adding example for JSONExtract which refers to a nested entry in JSON
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Daniil Ivanik 2024-12-03 12:14:51 +00:00 committed by GitHub
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docs/en/sql-reference/functions/json-functions.md
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@ -733,6 +733,18 @@ SELECT JSONExtract('{"day": "Thursday"}', 'day', 'Enum8(\'Sunday\' = 0, \'Monday
SELECT JSONExtract('{"day": 5}', 'day', 'Enum8(\'Sunday\' = 0, \'Monday\' = 1, \'Tuesday\' = 2, \'Wednesday\' = 3, \'Thursday\' = 4, \'Friday\' = 5, \'Saturday\' = 6)') = 'Friday'
```
Referring to a nested values by passing multiple indices_or_keys parameters:
```
SELECT JSONExtract('{"a":{"b":"hello","c":{"d":[1,2,3],"e":[1,3,7]}}}','a','c','Map(String, Array(UInt8))') AS val, toTypeName(val), val['d'];
```
Result:
```
┌─val───────────────────────┬─toTypeName(val)───────────┬─arrayElement(val, 'd')─┐
│ {'d':[1,2,3],'e':[1,3,7]} │ Map(String, Array(UInt8)) │ [1,2,3] │
└───────────────────────────┴───────────────────────────┴────────────────────────┘
```
### JSONExtractKeysAndValues
Parses key-value pairs from JSON where the values are of the given ClickHouse data type.