Use Arel::Nodes::BindParam instead of Arel.sql for substitute_at so that ActiveRecord::Relation merging works properly - tests RelationMergingTest#test_merging_reorders_bind_params and RelationMergingTest#test_relation_to_sql

Author: wbond

lib/active_record/connection_adapters/sqlserver/quoting.rb

@@ -67,7 +67,7 @@ def substitute_at(column, index)
 if column.respond_to?(:sql_type) && column.sql_type == 'timestamp'
 nil
 else
-Arel.sql "@#{index}"
+Arel::Nodes::BindParam.new "@#{index}"
 end
 end