Add table_alias_length for SQL Server.

Author: metaskills

lib/active_record/connection_adapters/sqlserver_adapter.rb

@@ -550,6 +550,10 @@ def update_sql(sql, name = nil)
 
       # SCHEMA STATEMENTS ========================================#
 
+      def table_alias_length
+        128
+      end
+      
       def tables(name = nil)
         execute("SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = 'BASE TABLE'", name) do |sth|
           result = sth.inject([]) do |tables, field|

test/cases/adapter_test_sqlserver.rb

@@ -15,6 +15,10 @@ def setup
 
   context 'For abstract behavior' do
 
+    should 'have a 128 max #table_alias_length' do
+      assert @connection.table_alias_length <= 128
+    end
+    
     should 'raise invalid statement error' do
       assert_raise(ActiveRecord::StatementInvalid) { Topic.connection.update_sql("UPDATE XXX") }
     end