cache quoted column names in SQLite3

we do this in other adapters, and it's a nice speed improvement

1 files changed, 2 insertions, 1 deletions

diff --git a/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb b/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb
index 400b586c95..7e184dd510 100644
--- a/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb
@@ -121,6 +121,7 @@ module ActiveRecord
         @config = config
 
         @visitor = Arel::Visitors::SQLite.new self
+        @quoted_column_names = {}
 
         if self.class.type_cast_config_to_boolean(config.fetch(:prepared_statements) { true })
           @prepared_statements = true
@@ -240,7 +241,7 @@ module ActiveRecord
       end
 
       def quote_column_name(name) #:nodoc:
-        %Q("#{name.to_s.gsub('"', '""')}")
+        @quoted_column_names[name] ||= %Q("#{name.to_s.gsub('"', '""')}")
       end
 
       #--