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snowflake.snowpark.udaf.UDAFRegistration.register

UDAFRegistration.register(handler: Type, return_type: Optional[DataType] = None, input_types: Optional[List[DataType]] = None, name: Optional[Union[str, Iterable[str]]] = None, is_permanent: bool = False, stage_location: Optional[str] = None, imports: Optional[List[Union[str, Tuple[str, str]]]] = None, packages: Optional[List[Union[str, module]]] = None, replace: bool = False, if_not_exists: bool = False, parallel: int = 4, external_access_integrations: Optional[List[str]] = None, secrets: Optional[Dict[str, str]] = None, comment: Optional[str] = None, copy_grants: bool = False, *, statement_params: Optional[Dict[str, str]] = None, source_code_display: bool = True, immutable: bool = False, **kwargs) → UserDefinedAggregateFunction[source]

Registers a Python function as a Snowflake Python UDAF and returns the UDAF. The usage, input arguments, and return value of this method are the same as they are for udaf(), but register() cannot be used as a decorator. See examples in UDAFRegistration and notes in udaf().

Parameters:

  • handler – A Python class used for creating the UDAF.

  • return_type – A DataType representing the return data type of the UDAF. Optional if type hints are provided.

  • input_types – A list of DataType representing the input data types of the UDAF. Optional if type hints are provided.

  • name – A string or list of strings that specify the name or fully-qualified object identifier (database name, schema name, and function name) for the UDAF in Snowflake, which allows you to call this UDAF in a SQL command or via agg() or group_by(). If it is not provided, a name will be automatically generated for the UDAF. A name must be specified when is_permanent is True.

  • is_permanent – Whether to create a permanent UDAF. The default is False. If it is True, a valid stage_location must be provided.

  • stage_location – The stage location where the Python file for the UDAF and its dependencies should be uploaded. The stage location must be specified when is_permanent is True, and it will be ignored when is_permanent is False. It can be any stage other than temporary stages and external stages.

  • imports – A list of imports that only apply to this UDAF. You can use a string to represent a file path (similar to the path argument in add_import()) in this list, or a tuple of two strings to represent a file path and an import path (similar to the import_path argument in add_import()). These UDAF-level imports will override the session-level imports added by add_import(). Note that an empty list means no import for this UDAF, and None or not specifying this parameter means using session-level imports.

  • packages – A list of packages that only apply to this UDAF. These UDAF-level packages will override the session-level packages added by add_packages() and add_requirements(). Note that an empty list means no package for this UDAF, and None or not specifying this parameter means using session-level packages. To use Python packages that are not available in Snowflake, refer to custom_package_usage_config().

  • replace – Whether to replace a UDAF that already was registered. The default is False. If it is False, attempting to register a UDAF with a name that already exists results in a SnowparkSQLException exception being thrown. If it is True, an existing UDAF with the same name is overwritten.

  • if_not_exists – Whether to skip creation of a UDAF when one with the same signature already exists. The default is False. if_not_exists and replace are mutually exclusive and a ValueError is raised when both are set. If it is True and a UDAF with the same signature exists, the UDAF creation is skipped.

  • parallel – The number of threads to use for uploading UDAF files with the PUT command. The default value is 4 and supported values are from 1 to 99. Increasing the number of threads can improve performance when uploading large UDAF files.

  • statement_params – Dictionary of statement level parameters to be set while executing this action.

  • source_code_display – Display the source code of the UDAF func as comments in the generated script. The source code is dynamically generated therefore it may not be identical to how the func is originally defined. The default is True. If it is False, source code will not be generated or displayed.

  • immutable – Whether the UDAF result is deterministic or not for the same input.

  • external_access_integrations – The names of one or more external access integrations. Each integration you specify allows access to the external network locations and secrets the integration specifies.

  • secrets – The key-value pairs of string types of secrets used to authenticate the external network location. The secrets can be accessed from handler code. The secrets specified as values must also be specified in the external access integration and the keys are strings used to retrieve the secrets using secret API.

  • comment – Adds a comment for the created object. See COMMENT

  • copy_grants – Specifies to retain the access privileges from the original function when a new function is created using CREATE OR REPLACE FUNCTION.

See also

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