Metadata.add_column can be slow

[amontanez24]

Problem Description

The metadata.add_column method can sometimes be unreasonably slow (a few seconds). This seems to be because during its validation, we check if it isn't a faker function, which seems to be a slow method in RDT.

SDV/sdv/metadata/single_table.py

Lines 229 to 243 in 8cec1f7

	def _validate_sdtype(self, sdtype):
	if not isinstance(sdtype, str):
	raise InvalidMetadataError(
	f'Invalid sdtype: {sdtype} is not a string. Please use one of the '
	'supported SDV sdtypes.'
	)
	if sdtype in self._DEFAULT_SDTYPES:
	return
	if not is_faker_function(sdtype):
	raise InvalidMetadataError(
	f"Invalid sdtype: '{sdtype}' is not recognized. Please use one of the "
	'supported SDV sdtypes.'
	)

Expected behavior

• See if the validation can be sped up. This may require speeding up the underlying function in RDT