ClickHouse/docs/en/operations/system-tables/functions.md

slug
/en/operations/system-tables/functions

functions

Contains information about normal and aggregate functions.

Columns:

• name (String) – The name of the function.
• is_aggregate (UInt8) — Whether the function is an aggregate function.
• is_deterministic (Nullable(UInt8)) - Whether the function is deterministic.
• case_insensitive, (UInt8) - Whether the function name can be used case-insensitively.
• alias_to, (String) - The original function name, if the function name is an alias.
• create_query, (String) - Unused.
• origin, (Enum8) - Unused.
• description, (String) - A high-level description what the function does.
• syntax, (String) - Signature of the function.
• arguments, (String) - What arguments does the function take.
• returned_value, (String) - What does the function return.
• examples, (String) - Example usage of the function.
• categories, (String) - The category of the function.

Example

 SELECT name, is_aggregate, is_deterministic, case_insensitive, alias_to FROM system.functions LIMIT 5;

┌─name─────────────────────┬─is_aggregate─┬─is_deterministic─┬─case_insensitive─┬─alias_to─┐
│ BLAKE3                   │            0 │                1 │                0 │          │
│ sipHash128Reference      │            0 │                1 │                0 │          │
│ mapExtractKeyLike        │            0 │                1 │                0 │          │
│ sipHash128ReferenceKeyed │            0 │                1 │                0 │          │
│ mapPartialSort           │            0 │                1 │                0 │          │
└──────────────────────────┴──────────────┴──────────────────┴──────────────────┴──────────┘

5 rows in set. Elapsed: 0.002 sec.