Fixed #27788 -- Dropped support for Oracle < 12.1.

3 files changed, 10 insertions, 34 deletions

diff --git a/django/contrib/gis/db/backends/oracle/operations.py b/django/contrib/gis/db/backends/oracle/operations.py
index 6fc4fb69aa..277a6a4b56 100644
--- a/django/contrib/gis/db/backends/oracle/operations.py
+++ b/django/contrib/gis/db/backends/oracle/operations.py
@@ -17,7 +17,6 @@ from django.contrib.gis.db.models import aggregates
 from django.contrib.gis.geometry.backend import Geometry
 from django.contrib.gis.measure import Distance
 from django.db.backends.oracle.operations import DatabaseOperations
-from django.utils.functional import cached_property
 
 DEFAULT_TOLERANCE = '0.05'
 
@@ -132,15 +131,10 @@ class OracleOperations(BaseSpatialOperations, DatabaseOperations):
 
     truncate_params = {'relate': None}
 
-    @cached_property
-    def unsupported_functions(self):
-        unsupported = {
-            'AsGeoJSON', 'AsKML', 'AsSVG', 'Envelope', 'ForceRHR', 'GeoHash',
-            'MakeValid', 'MemSize', 'Scale', 'SnapToGrid', 'Translate',
-        }
-        if self.connection.oracle_full_version < '12.1.0.2':
-            unsupported.add('BoundingCircle')
-        return unsupported
+    unsupported_functions = {
+        'AsGeoJSON', 'AsKML', 'AsSVG', 'Envelope', 'ForceRHR', 'GeoHash',
+        'MakeValid', 'MemSize', 'Scale', 'SnapToGrid', 'Translate',
+    }
 
     def geo_quote_name(self, name):
         return super().geo_quote_name(name).upper()
diff --git a/django/db/backends/base/features.py b/django/db/backends/base/features.py
index 8f9fbdcfea..d108dc1320 100644
--- a/django/db/backends/base/features.py
+++ b/django/db/backends/base/features.py
@@ -253,18 +253,15 @@ class BaseDatabaseFeatures:
         except NotImplementedError:
             return False
 
-    def introspected_boolean_field_type(self, field=None, created_separately=False):
+    def introspected_boolean_field_type(self, field=None):
         """
         What is the type returned when the backend introspects a BooleanField?
-        The optional arguments may be used to give further details of the field to be
-        introspected; in particular, they are provided by Django's test suite:
-        field -- the field definition
-        created_separately -- True if the field was added via a SchemaEditor's AddField,
-                              False if the field was created with the model
+        The `field` argument may be used to give further details of the field
+        to be introspected.
 
-        Note that return value from this function is compared by tests against actual
-        introspection results; it should provide expectations, not run an introspection
-        itself.
+        The return value from this function is compared by tests against actual
+        introspection results; it should provide expectations, not run an
+        introspection itself.
         """
         if self.can_introspect_null and field and field.null:
             return 'NullBooleanField'
diff --git a/django/db/backends/oracle/features.py b/django/db/backends/oracle/features.py
index 0e85f267f2..3e72a5c29d 100644
--- a/django/db/backends/oracle/features.py
+++ b/django/db/backends/oracle/features.py
@@ -35,18 +35,3 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     # Oracle doesn't ignore quoted identifiers case but the current backend
     # does by uppercasing all identifiers.
     ignores_table_name_case = True
-
-    def introspected_boolean_field_type(self, field=None, created_separately=False):
-        """
-        Some versions of Oracle -- we've seen this on 11.2.0.1 and suspect
-        it goes back -- have a weird bug where, when an integer column is
-        added to an existing table with a default, its precision is later
-        reported on introspection as 0, regardless of the real precision.
-        For Django introspection, this means that such columns are reported
-        as IntegerField even if they are really BigIntegerField or BooleanField.
-
-        The bug is solved in Oracle 11.2.0.2 and up.
-        """
-        if self.connection.oracle_full_version < '11.2.0.2' and field and field.has_default() and created_separately:
-            return 'IntegerField'
-        return super().introspected_boolean_field_type(field, created_separately)