1 files changed, 8 insertions, 18 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
index 4c3a8f7233..75e568b557 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
@@ -3,6 +3,7 @@ require 'bigdecimal'
 require 'bigdecimal/util'
 require 'active_support/core_ext/benchmark'
 require 'active_support/deprecation'
+require 'active_record/connection_adapters/schema_cache'
 
 module ActiveRecord
   module ConnectionAdapters # :nodoc:
@@ -51,6 +52,7 @@ module ActiveRecord
       define_callbacks :checkout, :checkin
 
       attr_accessor :visitor
+      attr_reader :schema_cache
 
       def initialize(connection, logger = nil) #:nodoc:
         @active = nil
@@ -60,24 +62,7 @@ module ActiveRecord
         @open_transactions = 0
         @instrumenter = ActiveSupport::Notifications.instrumenter
         @visitor = nil
-      end
-
-      # Returns a visitor instance for this adaptor, which conforms to the Arel::ToSql interface
-      def self.visitor_for(pool) # :nodoc:
-        adapter = pool.spec.config[:adapter]
-
-        if Arel::Visitors::VISITORS[adapter]
-          ActiveSupport::Deprecation.warn(
-            "Arel::Visitors::VISITORS is deprecated and will be removed. Database adapters " \
-            "should define a visitor_for method which returns the appropriate visitor for " \
-            "the database. For example, MysqlAdapter.visitor_for(pool) returns " \
-            "Arel::Visitors::MySQL.new(pool)."
-          )
-
-          Arel::Visitors::VISITORS[adapter].new(pool)
-        else
-          Arel::Visitors::ToSql.new(pool)
-        end
+        @schema_cache = SchemaCache.new self
       end
 
       # Returns the human-readable name of the adapter. Use mixed case - one
@@ -130,6 +115,11 @@ module ActiveRecord
         false
       end
 
+      # Does this adapter support index sort order?
+      def supports_index_sort_order?
+        false
+      end
+
       # QUOTING ==================================================
 
       # Override to return the quoted table name. Defaults to column quoting.