Added support for create_table :as, which fixes tests MigrationTest#test_create_table_with_query and MigrationTest#test_create_table_with_query_from_relation

Author: wbond

lib/active_record/connection_adapters/sqlserver/schema_creation.rb

@@ -22,6 +22,34 @@ def add_column_options!(sql, options)
             super
           end
         end
+
+        def visit_TableDefinition(o)
+          quoted_name = "#{quote_table_name((o.temporary ? '#' : '') + o.name.to_s)} "
+
+          if o.as
+            if o.as.is_a?(ActiveRecord::Relation)
+              select = o.as.to_sql
+            elsif o.as.is_a?(String)
+              select = o.as
+            else
+              raise "Only able to generate a table from a SELECT statement passed as a String or ActiveRecord::Relation"
+            end
+
+            create_sql = 'SELECT * INTO '
+            create_sql << quoted_name
+            create_sql << 'FROM ('
+            create_sql << select
+            create_sql << ') AS __sq'
+
+          else
+            create_sql = "CREATE TABLE "
+            create_sql << quoted_name
+            create_sql << "(#{o.columns.map { |c| accept c }.join(', ')}) "
+            create_sql << "#{o.options}"
+          end
+
+          create_sql
+        end
       end
     end
   end