distinctDynamicTypes

Calculates the list of distinct data types stored in Dynamic column.

Syntax

distinctDynamicTypes(dynamic)

Arguments

• dynamic — Dynamic column.

Returned Value

• The sorted list of data type names Array(String).

Example

Query:

DROP TABLE IF EXISTS test_dynamic;
CREATE TABLE test_dynamic(d Dynamic) ENGINE = Memory;
INSERT INTO test_dynamic VALUES (42), (NULL), ('Hello'), ([1, 2, 3]), ('2020-01-01'), (map(1, 2)), (43), ([4, 5]), (NULL), ('World'), (map(3, 4))

SELECT distinctDynamicTypes(d) FROM test_dynamic;

Result:

┌─distinctDynamicTypes(d)──────────────────────────────────────┐
│ ['Array(Int64)','Date','Int64','Map(UInt8, UInt8)','String'] │
└──────────────────────────────────────────────────────────────┘