/usr/lib/python3/dist-packages/sql/aggregate.py is in python3-sql 0.9-1.
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#
# Copyright (c) 2011-2015, Cédric Krier
# Copyright (c) 2011-2015, B2CK
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of the <organization> nor the
# names of its contributors may be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
from sql import Expression, Window
__all__ = ['Avg', 'BitAnd', 'BitOr', 'BoolAnd', 'BoolOr', 'Count', 'Every',
'Max', 'Min', 'Stddev', 'Sum', 'Variance']
class Aggregate(Expression):
__slots__ = ('expression', '_distinct', '_within', '_filter', '_window')
_sql = ''
def __init__(self, expression, distinct=False, within=None, filter_=None,
window=None):
# TODO order_by
super(Aggregate, self).__init__()
self.expression = expression
self.distinct = distinct
self.within = within
self.filter_ = filter_
self.window = window
@property
def distinct(self):
return self._distinct
@distinct.setter
def distinct(self, value):
assert isinstance(value, bool)
self._distinct = value
@property
def within(self):
return self._within
@within.setter
def within(self, value):
if value is not None:
if isinstance(value, Expression):
value = [value]
assert all(isinstance(col, Expression) for col in value)
self._within = value
@property
def filter_(self):
return self._filter
@filter_.setter
def filter_(self, value):
from sql.operators import And, Or
if value is not None:
assert isinstance(value, (Expression, And, Or))
self._filter = value
@property
def window(self):
return self._window
@window.setter
def window(self, value):
if value:
assert isinstance(value, Window)
self._window = value
def __str__(self):
quantifier = 'DISTINCT ' if self.distinct else ''
aggregate = '%s(%s%s)' % (self._sql, quantifier, self.expression)
within = ''
if self.within:
within = (' WITHIN GROUP (ORDER BY %s)'
% ', '.join(map(str, self.within)))
filter_ = ''
if self.filter_:
filter_ = ' FILTER (WHERE %s)' % self.filter_
window = ''
if self.window:
window = ' OVER "%s"' % self.window.alias
return aggregate + within + filter_ + window
@property
def params(self):
p = list(self.expression.params)
if self.within:
for expression in self.within:
p.extend(expression.params)
if self.filter_:
p.extend(self.filter_.params)
return tuple(p)
class Avg(Aggregate):
__slots__ = ()
_sql = 'AVG'
class BitAnd(Aggregate):
__slots__ = ()
_sql = 'BIT_AND'
class BitOr(Aggregate):
__slots__ = ()
_sql = 'BIT_OR'
class BoolAnd(Aggregate):
__slots__ = ()
_sql = 'BOOL_AND'
class BoolOr(Aggregate):
__slots__ = ()
_sql = 'BOOL_OR'
class Count(Aggregate):
__slots__ = ()
_sql = 'COUNT'
class Every(Aggregate):
__slots__ = ()
_sql = 'EVERY'
class Max(Aggregate):
__slots__ = ()
_sql = 'MAX'
class Min(Aggregate):
__slots__ = ()
_sql = 'MIN'
class Stddev(Aggregate):
__slots__ = ()
_sql = 'Stddev'
class Sum(Aggregate):
__slots__ = ()
_sql = 'SUM'
class Variance(Aggregate):
__slots__ = ()
_sql = 'VARIANCE'
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