1 files changed, 8 insertions, 7 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
index 279c232144..5f86a11c2d 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
@@ -46,6 +46,7 @@ module ActiveRecord
         float:       { name: "float" },
         decimal:     { name: "decimal" },
         datetime:    { name: "datetime" },
+        timestamp:   { name: "timestamp" },
         time:        { name: "time" },
         date:        { name: "date" },
         binary:      { name: "blob", limit: 65535 },
@@ -93,10 +94,6 @@ module ActiveRecord
         true
       end
 
-      def supports_primary_key?
-        true
-      end
-
       def supports_bulk_alter? #:nodoc:
         true
       end
@@ -655,6 +652,10 @@ module ActiveRecord
         !native_database_types[type].nil?
       end
 
+      def default_index_type?(index) # :nodoc:
+        index.using == :btree || super
+      end
+
       private
 
         def initialize_type_map(m)
@@ -708,7 +709,7 @@ module ActiveRecord
         end
 
         def extract_precision(sql_type)
-          if /time/.match?(sql_type)
+          if /\A(?:date)?time(?:stamp)?\b/.match?(sql_type)
             super || 0
           else
             super
@@ -869,9 +870,9 @@ module ActiveRecord
           variables["sql_auto_is_null"] = 0
 
           # Increase timeout so the server doesn't disconnect us.
-          wait_timeout = @config[:wait_timeout]
+          wait_timeout = self.class.type_cast_config_to_integer(@config[:wait_timeout])
           wait_timeout = 2147483 unless wait_timeout.is_a?(Integer)
-          variables["wait_timeout"] = self.class.type_cast_config_to_integer(wait_timeout)
+          variables["wait_timeout"] = wait_timeout
 
           defaults = [":default", :default].to_set