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venv/Lib/site-packages/django/db/backends/postgresql/features.py

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+import operator
+
+from django.db import InterfaceError
+from django.db.backends.base.features import BaseDatabaseFeatures
+from django.utils.functional import cached_property
+
+
+class DatabaseFeatures(BaseDatabaseFeatures):
+    allows_group_by_selected_pks = True
+    can_return_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
+    has_native_json_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
+    has_select_for_no_key_update = True
+    can_release_savepoints = True
+    supports_tablespaces = True
+    supports_transactions = True
+    can_introspect_materialized_views = 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
+    only_supports_unbounded_with_preceding_and_following = True
+    supports_aggregate_filter_clause = True
+    supported_explain_formats = {'JSON', 'TEXT', 'XML', 'YAML'}
+    validates_explain_options = False  # A query will error on invalid options.
+    supports_deferrable_unique_constraints = True
+    has_json_operators = True
+    json_key_contains_list_matching_requires_list = True
+    test_collations = {
+        'non_default': 'sv-x-icu',
+        'swedish_ci': 'sv-x-icu',
+    }
+    test_now_utc_template = "STATEMENT_TIMESTAMP() AT TIME ZONE 'UTC'"
+
+    django_test_skips = {
+        'opclasses are PostgreSQL only.': {
+            'indexes.tests.SchemaIndexesNotPostgreSQLTests.test_create_index_ignores_opclasses',
+        },
+    }
+
+    @cached_property
+    def introspected_field_types(self):
+        return {
+            **super().introspected_field_types,
+            'PositiveBigIntegerField': 'BigIntegerField',
+            'PositiveIntegerField': 'IntegerField',
+            'PositiveSmallIntegerField': 'SmallIntegerField',
+        }
+
+    @cached_property
+    def is_postgresql_11(self):
+        return self.connection.pg_version >= 110000
+
+    @cached_property
+    def is_postgresql_12(self):
+        return self.connection.pg_version >= 120000
+
+    @cached_property
+    def is_postgresql_13(self):
+        return self.connection.pg_version >= 130000
+
+    has_websearch_to_tsquery = property(operator.attrgetter('is_postgresql_11'))
+    supports_covering_indexes = property(operator.attrgetter('is_postgresql_11'))
+    supports_covering_gist_indexes = property(operator.attrgetter('is_postgresql_12'))
+    supports_non_deterministic_collations = property(operator.attrgetter('is_postgresql_12'))