Initial commit. Basic models mostly done.

venv/lib/python3.8/site-packages/django/db/backends/postgresql/features.py

@@ -0,0 +1,70 @@
+import operator
+
+from django.db.backends.base.features import BaseDatabaseFeatures
+from django.db.utils import InterfaceError
+from django.utils.functional import cached_property
+
+
+class DatabaseFeatures(BaseDatabaseFeatures):
+    allows_group_by_selected_pks = True
+    can_return_columns_from_insert = True
+    can_return_multiple_columns_from_insert = True
+    can_return_rows_from_bulk_insert = True
+    has_real_datatype = True
+    has_native_uuid_field = True
+    has_native_duration_field = True
+    can_defer_constraint_checks = True
+    has_select_for_update = True
+    has_select_for_update_nowait = True
+    has_select_for_update_of = True
+    has_select_for_update_skip_locked = True
+    can_release_savepoints = True
+    supports_tablespaces = True
+    supports_transactions = True
+    can_introspect_autofield = True
+    can_introspect_ip_address_field = True
+    can_introspect_materialized_views = True
+    can_introspect_small_integer_field = True
+    can_distinct_on_fields = True
+    can_rollback_ddl = True
+    supports_combined_alters = True
+    nulls_order_largest = True
+    closed_cursor_error_class = InterfaceError
+    has_case_insensitive_like = False
+    greatest_least_ignores_nulls = True
+    can_clone_databases = True
+    supports_temporal_subtraction = True
+    supports_slicing_ordering_in_compound = True
+    create_test_procedure_without_params_sql = """
+        CREATE FUNCTION test_procedure () RETURNS void AS $$
+        DECLARE
+            V_I INTEGER;
+        BEGIN
+            V_I := 1;
+        END;
+    $$ LANGUAGE plpgsql;"""
+    create_test_procedure_with_int_param_sql = """
+        CREATE FUNCTION test_procedure (P_I INTEGER) RETURNS void AS $$
+        DECLARE
+            V_I INTEGER;
+        BEGIN
+            V_I := P_I;
+        END;
+    $$ LANGUAGE plpgsql;"""
+    requires_casted_case_in_updates = True
+    supports_over_clause = True
+    supports_aggregate_filter_clause = True
+    supported_explain_formats = {'JSON', 'TEXT', 'XML', 'YAML'}
+    validates_explain_options = False  # A query will error on invalid options.
+
+    @cached_property
+    def is_postgresql_9_6(self):
+        return self.connection.pg_version >= 90600
+
+    @cached_property
+    def is_postgresql_10(self):
+        return self.connection.pg_version >= 100000
+
+    has_brin_autosummarize = property(operator.attrgetter('is_postgresql_10'))
+    has_phraseto_tsquery = property(operator.attrgetter('is_postgresql_9_6'))
+    supports_table_partitions = property(operator.attrgetter('is_postgresql_10'))