@ -29,6 +29,32 @@ from dataclasses import dataclass
from relational import rtypes
__all__ = [
'PRODUCT',
'DIFFERENCE',
'UNION',
'INTERSECTION',
'DIVISION',
'JOIN',
'JOIN_LEFT',
'JOIN_RIGHT',
'JOIN_FULL',
'PROJECTION',
'SELECTION',
'RENAME',
'ARROW',
'TokenizerException',
'ParserException',
'CallableString',
'Node',
'Unary',
'Binary',
'Variable',
'tree',
'parse',
]
PRODUCT = '*'
DIFFERENCE = '-'
UNION = '∪'