def _get_field_comment(field, separator='<STR_LIT>'):
title = field.descriptor.get('<STR_LIT:title>') or '<STR_LIT>'<EOL>description = field.descriptor.get('<STR_LIT:description>') or '<STR_LIT>'<EOL>return _get_comment(description, title, separator)<EOL>
Create SQL comment from field's title and description

:param field: tableschema-py Field, with optional 'title' and 'description' values
:param separator:
:return:

>>> _get_field_comment(tableschema.Field({'title': 'my_title', 'description': 'my_desc'}))
'my_title - my_desc'
>>> _get_field_comment(tableschema.Field({'title': 'my_title', 'description': None}))
'my_title'
>>> _get_field_comment(tableschema.Field({'title': '', 'description': 'my_description'}))
'my_description'
>>> _get_field_comment(tableschema.Field({}))
''