MALFORMED_FILE_REF error condition
FileType value is malformed.
CONFLICTING_VALUES
The FILE value has both a file reference and file content.
EMPTY_VALUE
The FILE value is empty: it has neither a file reference nor file content.
INVALID_LOCATION
The FILE '<path>' returned by the UDF is not in a location allowed for this <mode> FILE output.
MISSING_URI_KEY
The dict is missing the required 'uri' key.
URI_NOT_STRING
The 'uri' field must be a string, but got <actualType>.
URI_NULL
The 'uri' field must not be null.
WRONG_ARITY
Expected <expected> fields, but got <actual>.
WRONG_TYPE
Expected <expected>, but got <actualType>.