Inform Arel that we don't need additional type casting in batching

Part of the larger refactoring to remove type casting from Arel. We can
inform it that we already have the right type by wrapping the value in
an `Arel::Nodes::Quoted`. This commit can be reverted when we have
removed type casting from Arel in Rail 5.1

activerecord/lib/active_record/relation/batches.rb

@@ -102,9 +102,15 @@ module ActiveRecord
       start = options[:start]
       batch_size = options[:batch_size] || 1000
 
+      if start
+        # FIXME: Remove this when type casting is removed from Arel
+        # (Rails 5.1). We can pass start directly instead.
+        quoted_start = Arel::Nodes::Quoted.new(start)
+      end
+
       unless block_given?
         return to_enum(:find_in_batches, options) do
-          total = start ? where(table[primary_key].gteq(start)).size : size
+          total = start ? where(table[primary_key].gteq(quoted_start)).size : size
           (total - 1).div(batch_size) + 1
         end
       end
@@ -114,7 +120,7 @@ module ActiveRecord
       end
 
       relation = relation.reorder(batch_order).limit(batch_size)
-      records = start ? relation.where(table[primary_key].gteq(start)).to_a : relation.to_a
+      records = start ? relation.where(table[primary_key].gteq(quoted_start)).to_a : relation.to_a
 
       while records.any?
         records_size = records.size