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> Calculates the list of distinct paths and their types stored in JSON

# distinctJSONPathsAndTypes

<h2 id="distinctJSONPathsAndTypes">
  distinctJSONPathsAndTypes
</h2>

Introduced in: v24.9.0

Calculates the list of distinct paths and their types stored in [JSON](/reference/data-types/newjson) column.

<Note>
  If JSON declaration contains paths with specified types, these paths will be always included in the result of `distinctJSONPaths/distinctJSONPathsAndTypes` functions even if input data didn't have values for these paths.
</Note>

**Syntax**

```sql theme={null}
distinctJSONPathsAndTypes(json)
```

**Arguments**

* `json` — JSON column. [`JSON`](/reference/data-types/newjson)

**Returned value**

Returns the sorted map of paths and types. [`Map(String, Array(String))`](/reference/data-types/map)

**Examples**

**Basic usage with mixed types**

```sql title=Query theme={null}
DROP TABLE IF EXISTS test_json;
CREATE TABLE test_json(json JSON) ENGINE = Memory;
INSERT INTO test_json VALUES ('{"a" : 42, "b" : "Hello"}'), ('{"b" : [1, 2, 3], "c" : {"d" : {"e" : "2020-01-01"}}}'), ('{"a" : 43, "c" : {"d" : {"f" : [{"g" : 42}]}}}');

SELECT distinctJSONPathsAndTypes(json) FROM test_json;
```

```response title=Response theme={null}
┌─distinctJSONPathsAndTypes(json)───────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ {'a':['Int64'],'b':['Array(Nullable(Int64))','String'],'c.d.e':['Date'],'c.d.f':['Array(JSON(max_dynamic_types=16, max_dynamic_paths=256))']} │
└───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
```

**With declared JSON paths**

```sql title=Query theme={null}
DROP TABLE IF EXISTS test_json;
CREATE TABLE test_json(json JSON(a UInt32)) ENGINE = Memory;
INSERT INTO test_json VALUES ('{"b" : "Hello"}'), ('{"b" : "World", "c" : [1, 2, 3]}');

SELECT distinctJSONPathsAndTypes(json) FROM test_json;
```

```response title=Response theme={null}
┌─distinctJSONPathsAndTypes(json)────────────────────────────────┐
│ {'a':['UInt32'],'b':['String'],'c':['Array(Nullable(Int64))']} │
└────────────────────────────────────────────────────────────────┘
```