ROUTINE_COLUMNS
Preview
This feature is in Public Preview.
Applies to: 
Databricks SQL Databricks Runtime 11.3 LTS and above Unity Catalog only
INFORMATION_SCHEMA.ROUTINE_COLUMNS lists the result columns of table valued functions within the catalog.
The rows returned are limited to the routines the user is privileged to interact with.
This relation is an extension to the SQL standard information schema.
Definition
The ROUTINE_COLUMNS relation contains the following columns:
| Name | Data type | Nullable | Description |
|---|---|---|---|
SPECIFIC_CATALOG | STRING | No | Catalog containing the routine. |
SPECIFIC_SCHEMA | STRING | No | Database (schema) containing the routine. |
SPECIFIC_NAME | STRING | No | Schema unique (specific) name of the routine. |
ORDINAL_POSITION | INTEGER | No | The position (1-based) of the column in the result column list. |
COLUMN_NAME | STRING | Yes | Name of the column, NULL if unnamed. |
DATA_TYPE | STRING | No | The parameter data type name. |
FULL_DATA_TYPE | STRING | No | The parameter data type definition, for example 'DECIMAL(10, 4)'. |
CHARACTER_MAXIMUM_LENGTH | INTEGER | Yes | Always NULL, reserved for future use. |
CHARACTER_OCTET_LENGTH | STRING | Yes | Always NULL, reserved for future use. |
NUMERIC_PRECISION | INTEGER | Yes | For base-2 integral numeric types, FLOAT, and DOUBLE, the number of supported bits. For DECIMAL the number of digits, NULL otherwise. |
NUMERIC_PRECISION_RADIX | INTEGER | No | For DECIMAL 10, for all other numeric types 2, NULL otherwise. |
NUMERIC_SCALE | INTEGER | Yes | For integral numeric types 0, for DECIMAL the number of digits to the right of the decimal point, NULL otherwise. |
DATETIME_PRECISION | INTEGER | Yes | For DATE 0, for TIMESTAMP, and INTERVAL … SECOND 3, any other INTERVAL 0, NULL otherwise. |
INTERVAL_TYPE | STRING | Yes | For INTERVAL the unit portion of the interval, e.g. 'YEAR TO MONTH', NULL otherwise. |
INTERVAL_PRECISION | INTERAL | Yes | Always NULL, reserved for future use. |
MAXIMUM_CARDINALITY | INTEGER | Yes | Always NULL, reserved for future use. |
PARAMETER_DEFAULT | STRING | Yes | Always NULL, reserved for future use. |
COMMENT | STRING | Yes | An optional comment describing the result column. |
Constraints
The following constraints apply to the ROUTINE_COLUMNS relation:
| Class | Name | Column List | Description |
|---|---|---|---|
| Primary key | RTN_COLS_PK | SPECIFIC_CATALOG, SPECIFIC_SCHEMA, SPECIFIC_NAME, ORDINAL_POSITION | Uniquely identifies the result column. |
| Foreign key | RTN_COLS_ROUTINES_FK | SPECIFIC_CATALOG, SPECIFIC_SCHEMA, SPECIFIC_NAME | References ROUTINES |
Examples
SQL
> SELECT column_name, data_type
FROM information_schema.routine_columns
WHERE specific_schema = 'default'
AND specific_name = 'foo'
ORDER BY ordinal_position;