from sqlalchemy.testing import fixtures, eq_, is_
from sqlalchemy import testing
from sqlalchemy.testing import assert_raises_message
from sqlalchemy.sql import column, desc, asc, literal, collate, null, true, false
from sqlalchemy.sql.expression import BinaryExpression, \
                ClauseList, Grouping, \
                UnaryExpression, select, union, func, tuple_
from sqlalchemy.sql import operators, table
import operator
from sqlalchemy import String, Integer
from sqlalchemy import exc
from sqlalchemy.engine import default
from sqlalchemy.sql.elements import _literal_as_text
from sqlalchemy.schema import Column, Table, MetaData
from sqlalchemy.types import TypeEngine, TypeDecorator, UserDefinedType, Boolean
from sqlalchemy.dialects import mysql, firebird, postgresql, oracle, \
        sqlite, mssql
from sqlalchemy import util
import datetime
import collections
from sqlalchemy import text, literal_column
from sqlalchemy import and_, not_, between, or_
from sqlalchemy.sql import true, false, null

class LoopOperate(operators.ColumnOperators):
    def operate(self, op, *other, **kwargs):
        return op

class DefaultColumnComparatorTest(fixtures.TestBase):

    def _do_scalar_test(self, operator, compare_to):
        left = column('left')
        assert left.comparator.operate(operator).compare(
            compare_to(left)
        )
        self._loop_test(operator)

    def _do_operate_test(self, operator, right=column('right')):
        left = column('left')

        assert left.comparator.operate(operator, right).compare(
            BinaryExpression(_literal_as_text(left), _literal_as_text(right), operator)
        )

        assert operator(left, right).compare(
            BinaryExpression(_literal_as_text(left), _literal_as_text(right), operator)
        )

        self._loop_test(operator, right)

    def _loop_test(self, operator, *arg):
        l = LoopOperate()
        is_(
            operator(l, *arg),
            operator
        )

    def test_desc(self):
        self._do_scalar_test(operators.desc_op, desc)

    def test_asc(self):
        self._do_scalar_test(operators.asc_op, asc)

    def test_plus(self):
        self._do_operate_test(operators.add)

    def test_is_null(self):
        self._do_operate_test(operators.is_, None)

    def test_isnot_null(self):
        self._do_operate_test(operators.isnot, None)

    def test_is_null_const(self):
        self._do_operate_test(operators.is_, null())

    def test_is_true_const(self):
        self._do_operate_test(operators.is_, true())

    def test_is_false_const(self):
        self._do_operate_test(operators.is_, false())

    def test_equals_true(self):
        self._do_operate_test(operators.eq, True)

    def test_notequals_true(self):
        self._do_operate_test(operators.ne, True)

    def test_is_true(self):
        self._do_operate_test(operators.is_, True)

    def test_isnot_true(self):
        self._do_operate_test(operators.isnot, True)

    def test_is_false(self):
        self._do_operate_test(operators.is_, False)

    def test_isnot_false(self):
        self._do_operate_test(operators.isnot, False)

    def test_like(self):
        self._do_operate_test(operators.like_op)

    def test_notlike(self):
        self._do_operate_test(operators.notlike_op)

    def test_ilike(self):
        self._do_operate_test(operators.ilike_op)

    def test_notilike(self):
        self._do_operate_test(operators.notilike_op)

    def test_is(self):
        self._do_operate_test(operators.is_)

    def test_isnot(self):
        self._do_operate_test(operators.isnot)

    def test_no_getitem(self):
        assert_raises_message(
            NotImplementedError,
            "Operator 'getitem' is not supported on this expression",
            self._do_operate_test, operators.getitem
        )
        assert_raises_message(
            NotImplementedError,
            "Operator 'getitem' is not supported on this expression",
            lambda: column('left')[3]
        )

    def test_in(self):
        left = column('left')
        assert left.comparator.operate(operators.in_op, [1, 2, 3]).compare(
                BinaryExpression(
                    left,
                    Grouping(ClauseList(
                        literal(1), literal(2), literal(3)
                    )),
                    operators.in_op
                )
            )
        self._loop_test(operators.in_op, [1, 2, 3])

    def test_notin(self):
        left = column('left')
        assert left.comparator.operate(operators.notin_op, [1, 2, 3]).compare(
                BinaryExpression(
                    left,
                    Grouping(ClauseList(
                        literal(1), literal(2), literal(3)
                    )),
                    operators.notin_op
                )
            )
        self._loop_test(operators.notin_op, [1, 2, 3])

    def test_collate(self):
        left = column('left')
        right = "some collation"
        left.comparator.operate(operators.collate, right).compare(
            collate(left, right)
        )

    def test_concat(self):
        self._do_operate_test(operators.concat_op)

class CustomUnaryOperatorTest(fixtures.TestBase, testing.AssertsCompiledSQL):
    __dialect__ = 'default'

    def _factorial_fixture(self):
        class MyInteger(Integer):
            class comparator_factory(Integer.Comparator):
                def factorial(self):
                    return UnaryExpression(self.expr,
                                modifier=operators.custom_op("!"),
                                type_=MyInteger)

                def factorial_prefix(self):
                    return UnaryExpression(self.expr,
                                operator=operators.custom_op("!!"),
                                type_=MyInteger)

        return MyInteger

    def test_factorial(self):
        col = column('somecol', self._factorial_fixture())
        self.assert_compile(
            col.factorial(),
            "somecol !"
        )

    def test_double_factorial(self):
        col = column('somecol', self._factorial_fixture())
        self.assert_compile(
            col.factorial().factorial(),
            "somecol ! !"
        )

    def test_factorial_prefix(self):
        col = column('somecol', self._factorial_fixture())
        self.assert_compile(
            col.factorial_prefix(),
            "!! somecol"
        )

    def test_unary_no_ops(self):
        assert_raises_message(
            exc.CompileError,
            "Unary expression has no operator or modifier",
            UnaryExpression(literal("x")).compile
        )

    def test_unary_both_ops(self):
        assert_raises_message(
            exc.CompileError,
            "Unary expression does not support operator and "
                "modifier simultaneously",
            UnaryExpression(literal("x"),
                    operator=operators.custom_op("x"),
                    modifier=operators.custom_op("y")).compile
        )

class _CustomComparatorTests(object):
    def test_override_builtin(self):
        c1 = Column('foo', self._add_override_factory())
        self._assert_add_override(c1)

    def test_column_proxy(self):
        t = Table('t', MetaData(),
                Column('foo', self._add_override_factory())
            )
        proxied = t.select().c.foo
        self._assert_add_override(proxied)

    def test_alias_proxy(self):
        t = Table('t', MetaData(),
                Column('foo', self._add_override_factory())
            )
        proxied = t.alias().c.foo
        self._assert_add_override(proxied)

    def test_binary_propagate(self):
        c1 = Column('foo', self._add_override_factory())
        self._assert_add_override(c1 - 6)

    def test_reverse_binary_propagate(self):
        c1 = Column('foo', self._add_override_factory())
        self._assert_add_override(6 - c1)

    def test_binary_multi_propagate(self):
        c1 = Column('foo', self._add_override_factory())
        self._assert_add_override((c1 - 6) + 5)

    def test_no_boolean_propagate(self):
        c1 = Column('foo', self._add_override_factory())
        self._assert_not_add_override(c1 == 56)

    def _assert_add_override(self, expr):
        assert (expr + 5).compare(
            expr.op("goofy")(5)
        )

    def _assert_not_add_override(self, expr):
        assert not (expr + 5).compare(
            expr.op("goofy")(5)
        )

class CustomComparatorTest(_CustomComparatorTests, fixtures.TestBase):
    def _add_override_factory(self):

        class MyInteger(Integer):
            class comparator_factory(TypeEngine.Comparator):
                def __init__(self, expr):
                    self.expr = expr

                def __add__(self, other):
                    return self.expr.op("goofy")(other)


        return MyInteger


class TypeDecoratorComparatorTest(_CustomComparatorTests, fixtures.TestBase):
    def _add_override_factory(self):

        class MyInteger(TypeDecorator):
            impl = Integer

            class comparator_factory(TypeEngine.Comparator):
                def __init__(self, expr):
                    self.expr = expr

                def __add__(self, other):
                    return self.expr.op("goofy")(other)


        return MyInteger


class CustomEmbeddedinTypeDecoratorTest(_CustomComparatorTests, fixtures.TestBase):
    def _add_override_factory(self):
        class MyInteger(Integer):
            class comparator_factory(TypeEngine.Comparator):
                def __init__(self, expr):
                    self.expr = expr

                def __add__(self, other):
                    return self.expr.op("goofy")(other)


        class MyDecInteger(TypeDecorator):
            impl = MyInteger

        return MyDecInteger

class NewOperatorTest(_CustomComparatorTests, fixtures.TestBase):
    def _add_override_factory(self):
        class MyInteger(Integer):
            class comparator_factory(TypeEngine.Comparator):
                def __init__(self, expr):
                    self.expr = expr

                def foob(self, other):
                    return self.expr.op("foob")(other)
        return MyInteger

    def _assert_add_override(self, expr):
        assert (expr.foob(5)).compare(
            expr.op("foob")(5)
        )

    def _assert_not_add_override(self, expr):
        assert not hasattr(expr, "foob")

class ExtensionOperatorTest(fixtures.TestBase, testing.AssertsCompiledSQL):
    __dialect__ = 'default'

    def test_contains(self):
        class MyType(UserDefinedType):
            class comparator_factory(UserDefinedType.Comparator):
                def contains(self, other, **kw):
                    return self.op("->")(other)

        self.assert_compile(
            Column('x', MyType()).contains(5),
            "x -> :x_1"
        )

    def test_getitem(self):
        class MyType(UserDefinedType):
            class comparator_factory(UserDefinedType.Comparator):
                def __getitem__(self, index):
                    return self.op("->")(index)

        self.assert_compile(
            Column('x', MyType())[5],
            "x -> :x_1"
        )

    def test_op_not_an_iterator(self):
        # see [ticket:2726]
        class MyType(UserDefinedType):
            class comparator_factory(UserDefinedType.Comparator):
                def __getitem__(self, index):
                    return self.op("->")(index)

        col = Column('x', MyType())
        assert not isinstance(col, collections.Iterable)

    def test_lshift(self):
        class MyType(UserDefinedType):
            class comparator_factory(UserDefinedType.Comparator):
                def __lshift__(self, other):
                    return self.op("->")(other)

        self.assert_compile(
            Column('x', MyType()) << 5,
            "x -> :x_1"
        )

    def test_rshift(self):
        class MyType(UserDefinedType):
            class comparator_factory(UserDefinedType.Comparator):
                def __rshift__(self, other):
                    return self.op("->")(other)

        self.assert_compile(
            Column('x', MyType()) >> 5,
            "x -> :x_1"
        )


class BooleanEvalTest(fixtures.TestBase, testing.AssertsCompiledSQL):
    """test standalone booleans being wrapped in an AsBoolean, as well
    as true/false compilation."""

    def _dialect(self, native_boolean):
        d = default.DefaultDialect()
        d.supports_native_boolean = native_boolean
        return d

    def test_one(self):
        c = column('x', Boolean)
        self.assert_compile(
            select([c]).where(c),
            "SELECT x WHERE x",
            dialect=self._dialect(True)
        )

    def test_two(self):
        c = column('x', Boolean)
        self.assert_compile(
            select([c]).where(c),
            "SELECT x WHERE x = 1",
            dialect=self._dialect(False)
        )

    def test_three(self):
        c = column('x', Boolean)
        self.assert_compile(
            select([c]).where(~c),
            "SELECT x WHERE x = 0",
            dialect=self._dialect(False)
        )

    def test_four(self):
        c = column('x', Boolean)
        self.assert_compile(
            select([c]).where(~c),
            "SELECT x WHERE NOT x",
            dialect=self._dialect(True)
        )

    def test_five(self):
        c = column('x', Boolean)
        self.assert_compile(
            select([c]).having(c),
            "SELECT x HAVING x = 1",
            dialect=self._dialect(False)
        )

    def test_six(self):
        self.assert_compile(
            or_(false(), true()),
            "1 = 1",
            dialect=self._dialect(False)
        )

    def test_eight(self):
        self.assert_compile(
            and_(false(), true()),
            "false",
            dialect=self._dialect(True)
        )

    def test_nine(self):
        self.assert_compile(
            and_(false(), true()),
            "0 = 1",
            dialect=self._dialect(False)
        )

    def test_ten(self):
        c = column('x', Boolean)
        self.assert_compile(
            c == 1,
            "x = :x_1",
            dialect=self._dialect(False)
        )

    def test_eleven(self):
        c = column('x', Boolean)
        self.assert_compile(
            c.is_(true()),
            "x IS true",
            dialect=self._dialect(True)
        )

    def test_twelve(self):
        c = column('x', Boolean)
        # I don't have a solution for this one yet,
        # other than adding some heavy-handed conditionals
        # into compiler
        self.assert_compile(
            c.is_(true()),
            "x IS 1",
            dialect=self._dialect(False)
        )


class ConjunctionTest(fixtures.TestBase, testing.AssertsCompiledSQL):
    """test interaction of and_()/or_() with boolean , null constants
    """
    __dialect__ = default.DefaultDialect(supports_native_boolean=True)

    def test_one(self):
        self.assert_compile(~and_(true()), "false")

    def test_two(self):
        self.assert_compile(or_(~and_(true())), "false")

    def test_three(self):
        self.assert_compile(or_(and_()), "")

    def test_four(self):
        x = column('x')
        self.assert_compile(
                and_(or_(x == 5), or_(x == 7)),
                "x = :x_1 AND x = :x_2")


    def test_five(self):
        x = column("x")
        self.assert_compile(
            and_(true()._ifnone(None), x == 7),
            "x = :x_1"
        )

    def test_six(self):
        x = column("x")
        self.assert_compile(or_(true(), x == 7), "true")
        self.assert_compile(or_(x == 7, true()), "true")
        self.assert_compile(~or_(x == 7, true()), "false")

    def test_six_pt_five(self):
        x = column("x")
        self.assert_compile(select([x]).where(or_(x == 7, true())),
                "SELECT x WHERE true")

        self.assert_compile(select([x]).where(or_(x == 7, true())),
                "SELECT x WHERE 1 = 1",
                dialect=default.DefaultDialect(supports_native_boolean=False))

    def test_seven(self):
        x = column("x")
        self.assert_compile(
                and_(true(), x == 7, true(), x == 9),
                "x = :x_1 AND x = :x_2")

    def test_eight(self):
        x = column("x")
        self.assert_compile(
                or_(false(), x == 7, false(), x == 9),
                "x = :x_1 OR x = :x_2")

    def test_nine(self):
        x = column("x")
        self.assert_compile(
            and_(x == 7, x == 9, false(), x == 5),
            "false"
        )
        self.assert_compile(
            ~and_(x == 7, x == 9, false(), x == 5),
            "true"
        )

    def test_ten(self):
        self.assert_compile(
            and_(None, None),
            "NULL AND NULL"
        )

    def test_eleven(self):
        x = column("x")
        self.assert_compile(
            select([x]).where(None).where(None),
            "SELECT x WHERE NULL AND NULL"
        )

    def test_twelve(self):
        x = column("x")
        self.assert_compile(
            select([x]).where(and_(None, None)),
            "SELECT x WHERE NULL AND NULL"
        )

    def test_thirteen(self):
        x = column("x")
        self.assert_compile(
            select([x]).where(~and_(None, None)),
            "SELECT x WHERE NOT (NULL AND NULL)"
        )

    def test_fourteen(self):
        x = column("x")
        self.assert_compile(
            select([x]).where(~null()),
            "SELECT x WHERE NOT NULL"
        )


class OperatorPrecedenceTest(fixtures.TestBase, testing.AssertsCompiledSQL):
    __dialect__ = 'default'


    table1 = table('mytable',
        column('myid', Integer),
        column('name', String),
        column('description', String),
    )

    table2 = table('op', column('field'))

    def test_operator_precedence_1(self):
        self.assert_compile(
                    self.table2.select((self.table2.c.field == 5) == None),
            "SELECT op.field FROM op WHERE (op.field = :field_1) IS NULL")

    def test_operator_precedence_2(self):
        self.assert_compile(
                self.table2.select(
                        (self.table2.c.field + 5) == self.table2.c.field),
            "SELECT op.field FROM op WHERE op.field + :field_1 = op.field")

    def test_operator_precedence_3(self):
        self.assert_compile(
                    self.table2.select((self.table2.c.field + 5) * 6),
            "SELECT op.field FROM op WHERE (op.field + :field_1) * :param_1")

    def test_operator_precedence_4(self):
        self.assert_compile(self.table2.select((self.table2.c.field * 5) + 6),
            "SELECT op.field FROM op WHERE op.field * :field_1 + :param_1")

    def test_operator_precedence_5(self):
        self.assert_compile(self.table2.select(
                            5 + self.table2.c.field.in_([5, 6])),
            "SELECT op.field FROM op WHERE :param_1 + "
                        "(op.field IN (:field_1, :field_2))")

    def test_operator_precedence_6(self):
        self.assert_compile(self.table2.select(
                        (5 + self.table2.c.field).in_([5, 6])),
            "SELECT op.field FROM op WHERE :field_1 + op.field "
                    "IN (:param_1, :param_2)")

    def test_operator_precedence_7(self):
        self.assert_compile(self.table2.select(
                    not_(and_(self.table2.c.field == 5,
                        self.table2.c.field == 7))),
            "SELECT op.field FROM op WHERE NOT "
                "(op.field = :field_1 AND op.field = :field_2)")

    def test_operator_precedence_8(self):
        self.assert_compile(self.table2.select(not_(self.table2.c.field == 5)),
            "SELECT op.field FROM op WHERE op.field != :field_1")

    def test_operator_precedence_9(self):
        self.assert_compile(self.table2.select(
                        not_(self.table2.c.field.between(5, 6))),
            "SELECT op.field FROM op WHERE NOT "
                    "(op.field BETWEEN :field_1 AND :field_2)")

    def test_operator_precedence_10(self):
        self.assert_compile(self.table2.select(not_(self.table2.c.field) == 5),
            "SELECT op.field FROM op WHERE (NOT op.field) = :param_1")

    def test_operator_precedence_11(self):
        self.assert_compile(self.table2.select(
                        (self.table2.c.field == self.table2.c.field).\
                            between(False, True)),
            "SELECT op.field FROM op WHERE (op.field = op.field) "
                            "BETWEEN :param_1 AND :param_2")

    def test_operator_precedence_12(self):
        self.assert_compile(self.table2.select(
                        between((self.table2.c.field == self.table2.c.field),
                                    False, True)),
            "SELECT op.field FROM op WHERE (op.field = op.field) "
                    "BETWEEN :param_1 AND :param_2")

    def test_operator_precedence_13(self):
        self.assert_compile(self.table2.select(
                        self.table2.c.field.match(
                                self.table2.c.field).is_(None)),
            "SELECT op.field FROM op WHERE (op.field MATCH op.field) IS NULL")

    def test_operator_precedence_collate_1(self):
        self.assert_compile(
            self.table1.c.name == literal('foo').collate('utf-8'),
            "mytable.name = (:param_1 COLLATE utf-8)"
        )

    def test_operator_precedence_collate_2(self):
        self.assert_compile(
            (self.table1.c.name == literal('foo')).collate('utf-8'),
            "mytable.name = :param_1 COLLATE utf-8"
        )

    def test_operator_precedence_collate_3(self):
        self.assert_compile(
            self.table1.c.name.collate('utf-8') == 'foo',
            "(mytable.name COLLATE utf-8) = :param_1"
        )

    def test_operator_precedence_collate_4(self):
        self.assert_compile(
            and_(
                (self.table1.c.name == literal('foo')).collate('utf-8'),
                (self.table2.c.field == literal('bar')).collate('utf-8'),
            ),
            "mytable.name = :param_1 COLLATE utf-8 "
            "AND op.field = :param_2 COLLATE utf-8"
        )

    def test_operator_precedence_collate_5(self):
        self.assert_compile(
            select([self.table1.c.name]).order_by(
                        self.table1.c.name.collate('utf-8').desc()),
            "SELECT mytable.name FROM mytable "
            "ORDER BY mytable.name COLLATE utf-8 DESC"
        )

    def test_operator_precedence_collate_6(self):
        self.assert_compile(
            select([self.table1.c.name]).order_by(
                        self.table1.c.name.collate('utf-8').desc().nullslast()),
            "SELECT mytable.name FROM mytable "
            "ORDER BY mytable.name COLLATE utf-8 DESC NULLS LAST"
        )

    def test_operator_precedence_collate_7(self):
        self.assert_compile(
            select([self.table1.c.name]).order_by(
                        self.table1.c.name.collate('utf-8').asc()),
            "SELECT mytable.name FROM mytable "
            "ORDER BY mytable.name COLLATE utf-8 ASC"
        )

    def test_commutative_operators(self):
        self.assert_compile(
         literal("a") + literal("b") * literal("c"),
                ":param_1 || :param_2 * :param_3"
        )

    def test_op_operators(self):
        self.assert_compile(
            self.table1.select(self.table1.c.myid.op('hoho')(12) == 14),
            "SELECT mytable.myid, mytable.name, mytable.description FROM "
                    "mytable WHERE (mytable.myid hoho :myid_1) = :param_1"
        )

    def test_op_operators_comma_precedence(self):
        self.assert_compile(
            func.foo(self.table1.c.myid.op('hoho')(12)),
            "foo(mytable.myid hoho :myid_1)"
        )

    def test_op_operators_comparison_precedence(self):
        self.assert_compile(
            self.table1.c.myid.op('hoho')(12) == 5,
            "(mytable.myid hoho :myid_1) = :param_1"
        )

    def test_op_operators_custom_precedence(self):
        op1 = self.table1.c.myid.op('hoho', precedence=5)
        op2 = op1(5).op('lala', precedence=4)(4)
        op3 = op1(5).op('lala', precedence=6)(4)

        self.assert_compile(op2, "mytable.myid hoho :myid_1 lala :param_1")
        self.assert_compile(op3, "(mytable.myid hoho :myid_1) lala :param_1")

class OperatorAssociativityTest(fixtures.TestBase, testing.AssertsCompiledSQL):
    __dialect__ = 'default'

    def test_associativity_1(self):
        f = column('f')
        self.assert_compile(f - f, "f - f")

    def test_associativity_2(self):
        f = column('f')
        self.assert_compile(f - f - f, "(f - f) - f")

    def test_associativity_3(self):
        f = column('f')
        self.assert_compile((f - f) - f, "(f - f) - f")

    def test_associativity_4(self):
        f = column('f')
        self.assert_compile((f - f).label('foo') - f, "(f - f) - f")


    def test_associativity_5(self):
        f = column('f')
        self.assert_compile(f - (f - f), "f - (f - f)")

    def test_associativity_6(self):
        f = column('f')
        self.assert_compile(f - (f - f).label('foo'), "f - (f - f)")

    def test_associativity_7(self):
        f = column('f')
        # because - less precedent than /
        self.assert_compile(f / (f - f), "f / (f - f)")

    def test_associativity_8(self):
        f = column('f')
        self.assert_compile(f / (f - f).label('foo'), "f / (f - f)")

    def test_associativity_9(self):
        f = column('f')
        self.assert_compile(f / f - f, "f / f - f")

    def test_associativity_10(self):
        f = column('f')
        self.assert_compile((f / f) - f, "f / f - f")

    def test_associativity_11(self):
        f = column('f')
        self.assert_compile((f / f).label('foo') - f, "f / f - f")

    def test_associativity_12(self):
        f = column('f')
        # because / more precedent than -
        self.assert_compile(f - (f / f), "f - f / f")

    def test_associativity_13(self):
        f = column('f')
        self.assert_compile(f - (f / f).label('foo'), "f - f / f")

    def test_associativity_14(self):
        f = column('f')
        self.assert_compile(f - f / f, "f - f / f")

    def test_associativity_15(self):
        f = column('f')
        self.assert_compile((f - f) / f, "(f - f) / f")

    def test_associativity_16(self):
        f = column('f')
        self.assert_compile(((f - f) / f) - f, "(f - f) / f - f")

    def test_associativity_17(self):
        f = column('f')
        # - lower precedence than /
        self.assert_compile((f - f) / (f - f), "(f - f) / (f - f)")

    def test_associativity_18(self):
        f = column('f')
        # / higher precedence than -
        self.assert_compile((f / f) - (f / f), "f / f - f / f")

    def test_associativity_19(self):
        f = column('f')
        self.assert_compile((f / f) - (f - f), "f / f - (f - f)")

    def test_associativity_20(self):
        f = column('f')
        self.assert_compile((f / f) / (f - f), "(f / f) / (f - f)")

    def test_associativity_21(self):
        f = column('f')
        self.assert_compile(f / (f / (f - f)), "f / (f / (f - f))")

class InTest(fixtures.TestBase, testing.AssertsCompiledSQL):
    __dialect__ = 'default'

    table1 = table('mytable',
        column('myid', Integer),
    )
    table2 = table(
        'myothertable',
        column('otherid', Integer),
        column('othername', String)
    )

    def test_in_1(self):
        self.assert_compile(self.table1.c.myid.in_(['a']),
        "mytable.myid IN (:myid_1)")

    def test_in_2(self):
        self.assert_compile(~self.table1.c.myid.in_(['a']),
        "mytable.myid NOT IN (:myid_1)")

    def test_in_3(self):
        self.assert_compile(self.table1.c.myid.in_(['a', 'b']),
        "mytable.myid IN (:myid_1, :myid_2)")

    def test_in_4(self):
        self.assert_compile(self.table1.c.myid.in_(iter(['a', 'b'])),
        "mytable.myid IN (:myid_1, :myid_2)")

    def test_in_5(self):
        self.assert_compile(self.table1.c.myid.in_([literal('a')]),
        "mytable.myid IN (:param_1)")

    def test_in_6(self):
        self.assert_compile(self.table1.c.myid.in_([literal('a'), 'b']),
        "mytable.myid IN (:param_1, :myid_1)")

    def test_in_7(self):
        self.assert_compile(
                self.table1.c.myid.in_([literal('a'), literal('b')]),
        "mytable.myid IN (:param_1, :param_2)")

    def test_in_8(self):
        self.assert_compile(self.table1.c.myid.in_(['a', literal('b')]),
        "mytable.myid IN (:myid_1, :param_1)")

    def test_in_9(self):
        self.assert_compile(self.table1.c.myid.in_([literal(1) + 'a']),
        "mytable.myid IN (:param_1 + :param_2)")

    def test_in_10(self):
        self.assert_compile(self.table1.c.myid.in_([literal('a') + 'a', 'b']),
        "mytable.myid IN (:param_1 || :param_2, :myid_1)")

    def test_in_11(self):
        self.assert_compile(self.table1.c.myid.in_([literal('a') + \
                                            literal('a'), literal('b')]),
        "mytable.myid IN (:param_1 || :param_2, :param_3)")

    def test_in_12(self):
        self.assert_compile(self.table1.c.myid.in_([1, literal(3) + 4]),
        "mytable.myid IN (:myid_1, :param_1 + :param_2)")

    def test_in_13(self):
        self.assert_compile(self.table1.c.myid.in_([literal('a') < 'b']),
        "mytable.myid IN (:param_1 < :param_2)")

    def test_in_14(self):
        self.assert_compile(self.table1.c.myid.in_([self.table1.c.myid]),
        "mytable.myid IN (mytable.myid)")

    def test_in_15(self):
        self.assert_compile(self.table1.c.myid.in_(['a', self.table1.c.myid]),
        "mytable.myid IN (:myid_1, mytable.myid)")

    def test_in_16(self):
        self.assert_compile(self.table1.c.myid.in_([literal('a'),
                                    self.table1.c.myid]),
        "mytable.myid IN (:param_1, mytable.myid)")

    def test_in_17(self):
        self.assert_compile(self.table1.c.myid.in_([literal('a'), \
                                    self.table1.c.myid + 'a']),
        "mytable.myid IN (:param_1, mytable.myid + :myid_1)")

    def test_in_18(self):
        self.assert_compile(self.table1.c.myid.in_([literal(1), 'a' + \
                            self.table1.c.myid]),
        "mytable.myid IN (:param_1, :myid_1 + mytable.myid)")

    def test_in_19(self):
        self.assert_compile(self.table1.c.myid.in_([1, 2, 3]),
        "mytable.myid IN (:myid_1, :myid_2, :myid_3)")

    def test_in_20(self):
        self.assert_compile(self.table1.c.myid.in_(
                                select([self.table2.c.otherid])),
        "mytable.myid IN (SELECT myothertable.otherid FROM myothertable)")

    def test_in_21(self):
        self.assert_compile(~self.table1.c.myid.in_(
                            select([self.table2.c.otherid])),
        "mytable.myid NOT IN (SELECT myothertable.otherid FROM myothertable)")

    def test_in_22(self):
        self.assert_compile(
                self.table1.c.myid.in_(
                        text("SELECT myothertable.otherid FROM myothertable")
                    ),
                    "mytable.myid IN (SELECT myothertable.otherid "
                    "FROM myothertable)"
        )

    @testing.emits_warning('.*empty sequence.*')
    def test_in_23(self):
        self.assert_compile(self.table1.c.myid.in_([]),
        "mytable.myid != mytable.myid")

    def test_in_24(self):
        self.assert_compile(
            select([self.table1.c.myid.in_(select([self.table2.c.otherid]))]),
            "SELECT mytable.myid IN (SELECT myothertable.otherid "
                "FROM myothertable) AS anon_1 FROM mytable"
        )

    def test_in_25(self):
        self.assert_compile(
            select([self.table1.c.myid.in_(
                        select([self.table2.c.otherid]).as_scalar())]),
            "SELECT mytable.myid IN (SELECT myothertable.otherid "
                "FROM myothertable) AS anon_1 FROM mytable"
        )

    def test_in_26(self):
        self.assert_compile(self.table1.c.myid.in_(
            union(
                  select([self.table1.c.myid], self.table1.c.myid == 5),
                  select([self.table1.c.myid], self.table1.c.myid == 12),
            )
        ), "mytable.myid IN ("\
        "SELECT mytable.myid FROM mytable WHERE mytable.myid = :myid_1 "\
        "UNION SELECT mytable.myid FROM mytable WHERE mytable.myid = :myid_2)")

    def test_in_27(self):
        # test that putting a select in an IN clause does not
        # blow away its ORDER BY clause
        self.assert_compile(
            select([self.table1, self.table2],
                self.table2.c.otherid.in_(
                    select([self.table2.c.otherid],
                                    order_by=[self.table2.c.othername],
                                    limit=10, correlate=False)
                ),
                from_obj=[self.table1.join(self.table2,
                            self.table1.c.myid == self.table2.c.otherid)],
                order_by=[self.table1.c.myid]
            ),
            "SELECT mytable.myid, "
            "myothertable.otherid, myothertable.othername FROM mytable "\
            "JOIN myothertable ON mytable.myid = myothertable.otherid "
            "WHERE myothertable.otherid IN (SELECT myothertable.otherid "\
            "FROM myothertable ORDER BY myothertable.othername "
            "LIMIT :param_1) ORDER BY mytable.myid",
            {'param_1': 10}
        )

    def test_in_28(self):
        self.assert_compile(
            self.table1.c.myid.in_([None]),
            "mytable.myid IN (NULL)"
        )

    @testing.emits_warning('.*empty sequence.*')
    def test_in_29(self):
        self.assert_compile(self.table1.c.myid.notin_([]),
        "mytable.myid = mytable.myid")

    @testing.emits_warning('.*empty sequence.*')
    def test_in_30(self):
        self.assert_compile(~self.table1.c.myid.in_([]),
        "mytable.myid = mytable.myid")


class MathOperatorTest(fixtures.TestBase, testing.AssertsCompiledSQL):
    __dialect__ = 'default'

    table1 = table('mytable',
        column('myid', Integer),
    )

    def _test_math_op(self, py_op, sql_op):
        for (lhs, rhs, res) in (
            (5, self.table1.c.myid, ':myid_1 %s mytable.myid'),
            (5, literal(5), ':param_1 %s :param_2'),
            (self.table1.c.myid, 'b', 'mytable.myid %s :myid_1'),
            (self.table1.c.myid, literal(2.7), 'mytable.myid %s :param_1'),
            (self.table1.c.myid, self.table1.c.myid,
                    'mytable.myid %s mytable.myid'),
            (literal(5), 8, ':param_1 %s :param_2'),
            (literal(6), self.table1.c.myid, ':param_1 %s mytable.myid'),
            (literal(7), literal(5.5), ':param_1 %s :param_2'),
            ):
            self.assert_compile(py_op(lhs, rhs), res % sql_op)

    def test_math_op_add(self):
        self._test_math_op(operator.add, '+')

    def test_math_op_mul(self):
        self._test_math_op(operator.mul, '*')

    def test_math_op_sub(self):
        self._test_math_op(operator.sub, '-')

    def test_math_op_div(self):
        if util.py3k:
            self._test_math_op(operator.truediv, '/')
        else:
            self._test_math_op(operator.div, '/')

class ComparisonOperatorTest(fixtures.TestBase, testing.AssertsCompiledSQL):
    __dialect__ = 'default'

    table1 = table('mytable',
        column('myid', Integer),
    )

    def test_pickle_operators_one(self):
        clause = (self.table1.c.myid == 12) & \
                        self.table1.c.myid.between(15, 20) & \
                            self.table1.c.myid.like('hoho')
        eq_(str(clause), str(util.pickle.loads(util.pickle.dumps(clause))))

    def test_pickle_operators_two(self):
        clause = tuple_(1, 2, 3)
        eq_(str(clause), str(util.pickle.loads(util.pickle.dumps(clause))))

    def _test_comparison_op(self, py_op, fwd_op, rev_op):
        dt = datetime.datetime(2012, 5, 10, 15, 27, 18)
        for (lhs, rhs, l_sql, r_sql) in (
            ('a', self.table1.c.myid, ':myid_1', 'mytable.myid'),
            ('a', literal('b'), ':param_2', ':param_1'),  # note swap!
            (self.table1.c.myid, 'b', 'mytable.myid', ':myid_1'),
            (self.table1.c.myid, literal('b'), 'mytable.myid', ':param_1'),
            (self.table1.c.myid, self.table1.c.myid,
                            'mytable.myid', 'mytable.myid'),
            (literal('a'), 'b', ':param_1', ':param_2'),
            (literal('a'), self.table1.c.myid, ':param_1', 'mytable.myid'),
            (literal('a'), literal('b'), ':param_1', ':param_2'),
            (dt, literal('b'), ':param_2', ':param_1'),
            (literal('b'), dt, ':param_1', ':param_2'),
            ):

            # the compiled clause should match either (e.g.):
            # 'a' < 'b' -or- 'b' > 'a'.
            compiled = str(py_op(lhs, rhs))
            fwd_sql = "%s %s %s" % (l_sql, fwd_op, r_sql)
            rev_sql = "%s %s %s" % (r_sql, rev_op, l_sql)

            self.assert_(compiled == fwd_sql or compiled == rev_sql,
                         "\n'" + compiled + "'\n does not match\n'" +
                         fwd_sql + "'\n or\n'" + rev_sql + "'")

    def test_comparison_operators_lt(self):
        self._test_comparison_op(operator.lt, '<', '>'),

    def test_comparison_operators_gt(self):
        self._test_comparison_op(operator.gt, '>', '<')

    def test_comparison_operators_eq(self):
        self._test_comparison_op(operator.eq, '=', '=')

    def test_comparison_operators_ne(self):
        self._test_comparison_op(operator.ne, '!=', '!=')

    def test_comparison_operators_le(self):
        self._test_comparison_op(operator.le, '<=', '>=')

    def test_comparison_operators_ge(self):
        self._test_comparison_op(operator.ge, '>=', '<=')

class NonZeroTest(fixtures.TestBase):
    def _raises(self, expr):
        assert_raises_message(
            TypeError,
            "Boolean value of this clause is not defined",
            bool, expr
        )

    def _assert_true(self, expr):
        is_(bool(expr), True)

    def _assert_false(self, expr):
        is_(bool(expr), False)

    def test_column_identity_eq(self):
        c1 = column('c1')
        self._assert_true(c1 == c1)

    def test_column_identity_gt(self):
        c1 = column('c1')
        self._raises(c1 > c1)

    def test_column_compare_eq(self):
        c1, c2 = column('c1'), column('c2')
        self._assert_false(c1 == c2)

    def test_column_compare_gt(self):
        c1, c2 = column('c1'), column('c2')
        self._raises(c1 > c2)

    def test_binary_identity_eq(self):
        c1 = column('c1')
        expr = c1 > 5
        self._assert_true(expr == expr)

    def test_labeled_binary_identity_eq(self):
        c1 = column('c1')
        expr = (c1 > 5).label(None)
        self._assert_true(expr == expr)

    def test_annotated_binary_identity_eq(self):
        c1 = column('c1')
        expr1 = (c1 > 5)
        expr2 = expr1._annotate({"foo": "bar"})
        self._assert_true(expr1 == expr2)

    def test_labeled_binary_compare_gt(self):
        c1 = column('c1')
        expr1 = (c1 > 5).label(None)
        expr2 = (c1 > 5).label(None)
        self._assert_false(expr1 == expr2)

class NegationTest(fixtures.TestBase, testing.AssertsCompiledSQL):
    __dialect__ = 'default'

    table1 = table('mytable',
        column('myid', Integer),
        column('name', String),
    )

    def test_negate_operators_1(self):
        for (py_op, op) in (
            (operator.neg, '-'),
            (operator.inv, 'NOT '),
        ):
            for expr, expected in (
                (self.table1.c.myid, "mytable.myid"),
                (literal("foo"), ":param_1"),
            ):
                self.assert_compile(py_op(expr), "%s%s" % (op, expected))

    def test_negate_operators_2(self):
        self.assert_compile(
         self.table1.select((self.table1.c.myid != 12) &
                    ~(self.table1.c.name == 'john')),
         "SELECT mytable.myid, mytable.name FROM "
            "mytable WHERE mytable.myid != :myid_1 "
            "AND mytable.name != :name_1"
        )

    def test_negate_operators_3(self):
        self.assert_compile(
         self.table1.select((self.table1.c.myid != 12) &
                ~(self.table1.c.name.between('jack', 'john'))),
         "SELECT mytable.myid, mytable.name FROM "
             "mytable WHERE mytable.myid != :myid_1 AND "\
             "NOT (mytable.name BETWEEN :name_1 AND :name_2)"
        )

    def test_negate_operators_4(self):
        self.assert_compile(
         self.table1.select((self.table1.c.myid != 12) &
                ~and_(self.table1.c.name == 'john',
                        self.table1.c.name == 'ed',
                        self.table1.c.name == 'fred')),
         "SELECT mytable.myid, mytable.name FROM "
         "mytable WHERE mytable.myid != :myid_1 AND "\
         "NOT (mytable.name = :name_1 AND mytable.name = :name_2 "
         "AND mytable.name = :name_3)"
        )

    def test_negate_operators_5(self):
        self.assert_compile(
         self.table1.select((self.table1.c.myid != 12) & ~self.table1.c.name),
         "SELECT mytable.myid, mytable.name FROM "
            "mytable WHERE mytable.myid != :myid_1 AND NOT mytable.name"
        )



class LikeTest(fixtures.TestBase, testing.AssertsCompiledSQL):
    __dialect__ = 'default'

    table1 = table('mytable',
        column('myid', Integer),
        column('name', String),
    )

    def test_like_1(self):
        self.assert_compile(
                self.table1.c.myid.like('somstr'),
                "mytable.myid LIKE :myid_1")

    def test_like_2(self):
        self.assert_compile(
                ~self.table1.c.myid.like('somstr'),
                "mytable.myid NOT LIKE :myid_1")

    def test_like_3(self):
        self.assert_compile(
                self.table1.c.myid.like('somstr', escape='\\'),
                "mytable.myid LIKE :myid_1 ESCAPE '\\'")

    def test_like_4(self):
        self.assert_compile(
                ~self.table1.c.myid.like('somstr', escape='\\'),
                "mytable.myid NOT LIKE :myid_1 ESCAPE '\\'")

    def test_like_5(self):
        self.assert_compile(
                self.table1.c.myid.ilike('somstr', escape='\\'),
                "lower(mytable.myid) LIKE lower(:myid_1) ESCAPE '\\'")

    def test_like_6(self):
        self.assert_compile(
                ~self.table1.c.myid.ilike('somstr', escape='\\'),
                "lower(mytable.myid) NOT LIKE lower(:myid_1) ESCAPE '\\'")

    def test_like_7(self):
        self.assert_compile(
                self.table1.c.myid.ilike('somstr', escape='\\'),
                    "mytable.myid ILIKE %(myid_1)s ESCAPE '\\\\'",
                    dialect=postgresql.dialect())

    def test_like_8(self):
        self.assert_compile(
                ~self.table1.c.myid.ilike('somstr', escape='\\'),
                "mytable.myid NOT ILIKE %(myid_1)s ESCAPE '\\\\'",
                dialect=postgresql.dialect())

    def test_like_9(self):
        self.assert_compile(
                self.table1.c.name.ilike('%something%'),
                "lower(mytable.name) LIKE lower(:name_1)")

    def test_like_10(self):
        self.assert_compile(
                self.table1.c.name.ilike('%something%'),
                "mytable.name ILIKE %(name_1)s",
                dialect=postgresql.dialect())

    def test_like_11(self):
        self.assert_compile(
                ~self.table1.c.name.ilike('%something%'),
                "lower(mytable.name) NOT LIKE lower(:name_1)")

    def test_like_12(self):
        self.assert_compile(
                ~self.table1.c.name.ilike('%something%'),
                "mytable.name NOT ILIKE %(name_1)s",
                dialect=postgresql.dialect())

class MatchTest(fixtures.TestBase, testing.AssertsCompiledSQL):
    __dialect__ = 'default'

    table1 = table('mytable',
        column('myid', Integer),
        column('name', String),
    )

    def test_match_1(self):
        self.assert_compile(self.table1.c.myid.match('somstr'),
                        "mytable.myid MATCH ?",
                        dialect=sqlite.dialect())

    def test_match_2(self):
        self.assert_compile(self.table1.c.myid.match('somstr'),
                        "MATCH (mytable.myid) AGAINST (%s IN BOOLEAN MODE)",
                        dialect=mysql.dialect())

    def test_match_3(self):
        self.assert_compile(self.table1.c.myid.match('somstr'),
                        "CONTAINS (mytable.myid, :myid_1)",
                        dialect=mssql.dialect())

    def test_match_4(self):
        self.assert_compile(self.table1.c.myid.match('somstr'),
                        "mytable.myid @@ to_tsquery(%(myid_1)s)",
                        dialect=postgresql.dialect())

    def test_match_5(self):
        self.assert_compile(self.table1.c.myid.match('somstr'),
                        "CONTAINS (mytable.myid, :myid_1)",
                        dialect=oracle.dialect())

class ComposedLikeOperatorsTest(fixtures.TestBase, testing.AssertsCompiledSQL):
    __dialect__ = 'default'

    def test_contains(self):
        self.assert_compile(
            column('x').contains('y'),
            "x LIKE '%%' || :x_1 || '%%'",
            checkparams={'x_1': 'y'}
        )

    def test_contains_escape(self):
        self.assert_compile(
            column('x').contains('y', escape='\\'),
            "x LIKE '%%' || :x_1 || '%%' ESCAPE '\\'",
            checkparams={'x_1': 'y'}
        )

    def test_contains_literal(self):
        self.assert_compile(
            column('x').contains(literal_column('y')),
            "x LIKE '%%' || y || '%%'",
            checkparams={}
        )

    def test_contains_text(self):
        self.assert_compile(
            column('x').contains(text('y')),
            "x LIKE '%%' || y || '%%'",
            checkparams={}
        )

    def test_not_contains(self):
        self.assert_compile(
            ~column('x').contains('y'),
            "x NOT LIKE '%%' || :x_1 || '%%'",
            checkparams={'x_1': 'y'}
        )

    def test_not_contains_escape(self):
        self.assert_compile(
            ~column('x').contains('y', escape='\\'),
            "x NOT LIKE '%%' || :x_1 || '%%' ESCAPE '\\'",
            checkparams={'x_1': 'y'}
        )

    def test_contains_concat(self):
        self.assert_compile(
            column('x').contains('y'),
            "x LIKE concat(concat('%%', %s), '%%')",
            checkparams={'x_1': 'y'},
            dialect=mysql.dialect()
        )

    def test_not_contains_concat(self):
        self.assert_compile(
            ~column('x').contains('y'),
            "x NOT LIKE concat(concat('%%', %s), '%%')",
            checkparams={'x_1': 'y'},
            dialect=mysql.dialect()
        )

    def test_contains_literal_concat(self):
        self.assert_compile(
            column('x').contains(literal_column('y')),
            "x LIKE concat(concat('%%', y), '%%')",
            checkparams={},
            dialect=mysql.dialect()
        )

    def test_contains_text_concat(self):
        self.assert_compile(
            column('x').contains(text('y')),
            "x LIKE concat(concat('%%', y), '%%')",
            checkparams={},
            dialect=mysql.dialect()
        )

    def test_startswith(self):
        self.assert_compile(
            column('x').startswith('y'),
            "x LIKE :x_1 || '%%'",
            checkparams={'x_1': 'y'}
        )

    def test_startswith_escape(self):
        self.assert_compile(
            column('x').startswith('y', escape='\\'),
            "x LIKE :x_1 || '%%' ESCAPE '\\'",
            checkparams={'x_1': 'y'}
        )

    def test_not_startswith(self):
        self.assert_compile(
            ~column('x').startswith('y'),
            "x NOT LIKE :x_1 || '%%'",
            checkparams={'x_1': 'y'}
        )

    def test_not_startswith_escape(self):
        self.assert_compile(
            ~column('x').startswith('y', escape='\\'),
            "x NOT LIKE :x_1 || '%%' ESCAPE '\\'",
            checkparams={'x_1': 'y'}
        )

    def test_startswith_literal(self):
        self.assert_compile(
            column('x').startswith(literal_column('y')),
            "x LIKE y || '%%'",
            checkparams={}
        )

    def test_startswith_text(self):
        self.assert_compile(
            column('x').startswith(text('y')),
            "x LIKE y || '%%'",
            checkparams={}
        )

    def test_startswith_concat(self):
        self.assert_compile(
            column('x').startswith('y'),
            "x LIKE concat(%s, '%%')",
            checkparams={'x_1': 'y'},
            dialect=mysql.dialect()
        )

    def test_not_startswith_concat(self):
        self.assert_compile(
            ~column('x').startswith('y'),
            "x NOT LIKE concat(%s, '%%')",
            checkparams={'x_1': 'y'},
            dialect=mysql.dialect()
        )

    def test_startswith_firebird(self):
        self.assert_compile(
            column('x').startswith('y'),
            "x STARTING WITH :x_1",
            checkparams={'x_1': 'y'},
            dialect=firebird.dialect()
        )

    def test_not_startswith_firebird(self):
        self.assert_compile(
            ~column('x').startswith('y'),
            "x NOT STARTING WITH :x_1",
            checkparams={'x_1': 'y'},
            dialect=firebird.dialect()
        )

    def test_startswith_literal_mysql(self):
        self.assert_compile(
            column('x').startswith(literal_column('y')),
            "x LIKE concat(y, '%%')",
            checkparams={},
            dialect=mysql.dialect()
        )

    def test_startswith_text_mysql(self):
        self.assert_compile(
            column('x').startswith(text('y')),
            "x LIKE concat(y, '%%')",
            checkparams={},
            dialect=mysql.dialect()
        )

    def test_endswith(self):
        self.assert_compile(
            column('x').endswith('y'),
            "x LIKE '%%' || :x_1",
            checkparams={'x_1': 'y'}
        )

    def test_endswith_escape(self):
        self.assert_compile(
            column('x').endswith('y', escape='\\'),
            "x LIKE '%%' || :x_1 ESCAPE '\\'",
            checkparams={'x_1': 'y'}
        )

    def test_not_endswith(self):
        self.assert_compile(
            ~column('x').endswith('y'),
            "x NOT LIKE '%%' || :x_1",
            checkparams={'x_1': 'y'}
        )

    def test_not_endswith_escape(self):
        self.assert_compile(
            ~column('x').endswith('y', escape='\\'),
            "x NOT LIKE '%%' || :x_1 ESCAPE '\\'",
            checkparams={'x_1': 'y'}
        )

    def test_endswith_literal(self):
        self.assert_compile(
            column('x').endswith(literal_column('y')),
            "x LIKE '%%' || y",
            checkparams={}
        )

    def test_endswith_text(self):
        self.assert_compile(
            column('x').endswith(text('y')),
            "x LIKE '%%' || y",
            checkparams={}
        )

    def test_endswith_mysql(self):
        self.assert_compile(
            column('x').endswith('y'),
            "x LIKE concat('%%', %s)",
            checkparams={'x_1': 'y'},
            dialect=mysql.dialect()
        )

    def test_not_endswith_mysql(self):
        self.assert_compile(
            ~column('x').endswith('y'),
            "x NOT LIKE concat('%%', %s)",
            checkparams={'x_1': 'y'},
            dialect=mysql.dialect()
        )

    def test_endswith_literal_mysql(self):
        self.assert_compile(
            column('x').endswith(literal_column('y')),
            "x LIKE concat('%%', y)",
            checkparams={},
            dialect=mysql.dialect()
        )

    def test_endswith_text_mysql(self):
        self.assert_compile(
            column('x').endswith(text('y')),
            "x LIKE concat('%%', y)",
            checkparams={},
            dialect=mysql.dialect()
        )

class CustomOpTest(fixtures.TestBase):
    def test_is_comparison(self):
        c = column('x')
        c2 = column('y')
        op1 = c.op('$', is_comparison=True)(c2).operator
        op2 = c.op('$', is_comparison=False)(c2).operator

        assert operators.is_comparison(op1)
        assert not operators.is_comparison(op2)

