def setUp(self): super(ExpressionTestCase, self).setUp() self.table = Table.ref('test_table') self.id_col = Column(table='test_table', name='id', spatial=False) self.id_eq_100 = Comparison(eqcomp=EqComparison(lhs=Target(col=self.id_col), rhs=Target(ival=100), eq=Equality.EQ)) self.id_lt_100 = Comparison(eqcomp=EqComparison(lhs=Target(col=self.id_col), rhs=Target(ival=100), eq=Equality.LT)) self.id_is_null = Comparison(nullcomp=NullComparison(isnull=True, col=self.id_col)) self.id_not_null = Comparison(nullcomp=NullComparison(isnull=False, col=self.id_col))