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venv/Lib/site-packages/django/contrib/gis/db/models/aggregates.py

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+from django.contrib.gis.db.models.fields import (
+    ExtentField, GeometryCollectionField, GeometryField, LineStringField,
+)
+from django.db.models import Aggregate, Value
+from django.utils.functional import cached_property
+
+__all__ = ['Collect', 'Extent', 'Extent3D', 'MakeLine', 'Union']
+
+
+class GeoAggregate(Aggregate):
+    function = None
+    is_extent = False
+
+    @cached_property
+    def output_field(self):
+        return self.output_field_class(self.source_expressions[0].output_field.srid)
+
+    def as_sql(self, compiler, connection, function=None, **extra_context):
+        # this will be called again in parent, but it's needed now - before
+        # we get the spatial_aggregate_name
+        connection.ops.check_expression_support(self)
+        return super().as_sql(
+            compiler,
+            connection,
+            function=function or connection.ops.spatial_aggregate_name(self.name),
+            **extra_context
+        )
+
+    def as_oracle(self, compiler, connection, **extra_context):
+        if not self.is_extent:
+            tolerance = self.extra.get('tolerance') or getattr(self, 'tolerance', 0.05)
+            clone = self.copy()
+            clone.set_source_expressions([
+                *self.get_source_expressions(),
+                Value(tolerance),
+            ])
+            template = '%(function)s(SDOAGGRTYPE(%(expressions)s))'
+            return clone.as_sql(compiler, connection, template=template, **extra_context)
+        return self.as_sql(compiler, connection, **extra_context)
+
+    def resolve_expression(self, query=None, allow_joins=True, reuse=None, summarize=False, for_save=False):
+        c = super().resolve_expression(query, allow_joins, reuse, summarize, for_save)
+        for expr in c.get_source_expressions():
+            if not hasattr(expr.field, 'geom_type'):
+                raise ValueError('Geospatial aggregates only allowed on geometry fields.')
+        return c
+
+
+class Collect(GeoAggregate):
+    name = 'Collect'
+    output_field_class = GeometryCollectionField
+
+
+class Extent(GeoAggregate):
+    name = 'Extent'
+    is_extent = '2D'
+
+    def __init__(self, expression, **extra):
+        super().__init__(expression, output_field=ExtentField(), **extra)
+
+    def convert_value(self, value, expression, connection):
+        return connection.ops.convert_extent(value)
+
+
+class Extent3D(GeoAggregate):
+    name = 'Extent3D'
+    is_extent = '3D'
+
+    def __init__(self, expression, **extra):
+        super().__init__(expression, output_field=ExtentField(), **extra)
+
+    def convert_value(self, value, expression, connection):
+        return connection.ops.convert_extent3d(value)
+
+
+class MakeLine(GeoAggregate):
+    name = 'MakeLine'
+    output_field_class = LineStringField
+
+
+class Union(GeoAggregate):
+    name = 'Union'
+    output_field_class = GeometryField