1 files changed, 13 insertions, 2 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
index c0ead17b3b..dc970c384b 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
@@ -6,7 +6,6 @@ require "active_record/connection_adapters/sql_type_metadata"
 require "active_record/connection_adapters/abstract/schema_dumper"
 require "active_record/connection_adapters/abstract/schema_creation"
 require "active_support/concurrency/load_interlock_aware_monitor"
-require "active_support/deprecation"
 require "arel/collectors/bind"
 require "arel/collectors/composite"
 require "arel/collectors/sql_string"
@@ -106,6 +105,14 @@ module ActiveRecord
         Regexp.union(*parts)
       end
 
+      def self.quoted_column_names # :nodoc:
+        @quoted_column_names ||= {}
+      end
+
+      def self.quoted_table_names # :nodoc:
+        @quoted_table_names ||= {}
+      end
+
       def initialize(connection, logger = nil, config = {}) # :nodoc:
         super()
 
@@ -116,7 +123,6 @@ module ActiveRecord
         @config              = config
         @pool                = ActiveRecord::ConnectionAdapters::NullPool.new
         @idle_since          = Concurrent.monotonic_time
-        @quoted_column_names, @quoted_table_names = {}, {}
         @visitor = arel_visitor
         @statements = build_statement_pool
         @lock = ActiveSupport::Concurrency::LoadInterlockAwareMonitor.new
@@ -264,6 +270,11 @@ module ActiveRecord
         self.class::ADAPTER_NAME
       end
 
+      # Does the database for this adapter exist?
+      def self.database_exists?(config)
+        raise NotImplementedError
+      end
+
       # Does this adapter support DDL rollbacks in transactions? That is, would
       # CREATE TABLE or ALTER TABLE get rolled back by a transaction?
       def supports_ddl_transactions?