Fixed #3566 -- Added support for aggregation to the ORM. See the documentation for details on usage.

Many thanks to:
 * Nicolas Lara, who worked on this feature during the 2008 Google Summer of Code.
 * Alex Gaynor for his help debugging and fixing a number of issues.
 * Justin Bronn for his help integrating with contrib.gis.
 * Karen Tracey for her help with cross-platform testing.
 * Ian Kelly for his help testing and fixing Oracle support.
 * Malcolm Tredinnick for his invaluable review notes.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9742 bcc190cf-cafb-0310-a4f2-bffc1f526a37

1 files changed, 0 insertions, 53 deletions

diff --git a/django/db/models/sql/datastructures.py b/django/db/models/sql/datastructures.py
index 913d8fde25..4d53999c79 100644
--- a/django/db/models/sql/datastructures.py
+++ b/django/db/models/sql/datastructures.py
@@ -25,59 +25,6 @@ class RawValue(object):
     def __init__(self, value):
         self.value = value
 
-class Aggregate(object):
-    """
-    Base class for all aggregate-related classes (min, max, avg, count, sum).
-    """
-    def relabel_aliases(self, change_map):
-        """
-        Relabel the column alias, if necessary. Must be implemented by
-        subclasses.
-        """
-        raise NotImplementedError
-
-    def as_sql(self, quote_func=None):
-        """
-        Returns the SQL string fragment for this object.
-
-        The quote_func function is used to quote the column components. If
-        None, it defaults to doing nothing.
-
-        Must be implemented by subclasses.
-        """
-        raise NotImplementedError
-
-class Count(Aggregate):
-    """
-    Perform a count on the given column.
-    """
-    def __init__(self, col='*', distinct=False):
-        """
-        Set the column to count on (defaults to '*') and set whether the count
-        should be distinct or not.
-        """
-        self.col = col
-        self.distinct = distinct
-
-    def relabel_aliases(self, change_map):
-        c = self.col
-        if isinstance(c, (list, tuple)):
-            self.col = (change_map.get(c[0], c[0]), c[1])
-
-    def as_sql(self, quote_func=None):
-        if not quote_func:
-            quote_func = lambda x: x
-        if isinstance(self.col, (list, tuple)):
-            col = ('%s.%s' % tuple([quote_func(c) for c in self.col]))
-        elif hasattr(self.col, 'as_sql'):
-            col = self.col.as_sql(quote_func)
-        else:
-            col = self.col
-        if self.distinct:
-            return 'COUNT(DISTINCT %s)' % col
-        else:
-            return 'COUNT(%s)' % col
-
 class Date(object):
     """
     Add a date selection column.