Share the column and table name quote cache between connections

4 files changed, 14 insertions, 7 deletions

diff --git a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
index f9edb12759..cfdab96397 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
@@ -106,6 +106,14 @@ 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 +124,6 @@ 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
diff --git a/activerecord/lib/active_record/connection_adapters/mysql/quoting.rb b/activerecord/lib/active_record/connection_adapters/mysql/quoting.rb
index dfed5471f4..0069f5871c 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql/quoting.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql/quoting.rb
@@ -5,11 +5,11 @@ module ActiveRecord
     module MySQL
       module Quoting # :nodoc:
         def quote_column_name(name)
-          @quoted_column_names[name] ||= "`#{super.gsub('`', '``')}`"
+          self.class.quoted_column_names[name] ||= "`#{super.gsub('`', '``')}`"
         end
 
         def quote_table_name(name)
-          @quoted_table_names[name] ||= super.gsub(".", "`.`").freeze
+          self.class.quoted_table_names[name] ||= super.gsub(".", "`.`").freeze
         end
 
         def unquoted_true
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/quoting.rb b/activerecord/lib/active_record/connection_adapters/postgresql/quoting.rb
index 0c800dca83..07b66de366 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/quoting.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/quoting.rb
@@ -30,7 +30,7 @@ module ActiveRecord
         # - "schema.name".table_name
         # - "schema.name"."table.name"
         def quote_table_name(name) # :nodoc:
-          @quoted_table_names[name] ||= Utils.extract_schema_qualified_name(name.to_s).quoted.freeze
+          self.class.quoted_table_names[name] ||= Utils.extract_schema_qualified_name(name.to_s).quoted.freeze
         end
 
         # Quotes schema names for use in SQL queries.
@@ -44,7 +44,7 @@ module ActiveRecord
 
         # Quotes column names for use in SQL queries.
         def quote_column_name(name) # :nodoc:
-          @quoted_column_names[name] ||= PG::Connection.quote_ident(super).freeze
+          self.class.quoted_column_names[name] ||= PG::Connection.quote_ident(super).freeze
         end
 
         # Quote date/time values for use in SQL input.
diff --git a/activerecord/lib/active_record/connection_adapters/sqlite3/quoting.rb b/activerecord/lib/active_record/connection_adapters/sqlite3/quoting.rb
index 58787cf9db..9b74a774e5 100644
--- a/activerecord/lib/active_record/connection_adapters/sqlite3/quoting.rb
+++ b/activerecord/lib/active_record/connection_adapters/sqlite3/quoting.rb
@@ -13,11 +13,11 @@ module ActiveRecord
         end
 
         def quote_table_name(name)
-          @quoted_table_names[name] ||= super.gsub(".", "\".\"").freeze
+          self.class.quoted_table_names[name] ||= super.gsub(".", "\".\"").freeze
         end
 
         def quote_column_name(name)
-          @quoted_column_names[name] ||= %Q("#{super.gsub('"', '""')}")
+          self.class.quoted_column_names[name] ||= %Q("#{super.gsub('"', '""')}")
         end
 
         def quoted_time(value)