Use class objects rather than strings for the dispatch cache

The only reason we're using strings is to pre-populate the cache, but
`Class#name` returns a new string instance on every call. This is a
pretty major source of memory usage. We don't technically need to
pre-populate the cache, and not doing so allows us to go back to using
cache objects

1 files changed, 1 insertions, 1 deletions

diff --git a/test/visitors/test_to_sql.rb b/test/visitors/test_to_sql.rb
index 7895866809..2e3f7f8624 100644
--- a/test/visitors/test_to_sql.rb
+++ b/test/visitors/test_to_sql.rb
@@ -36,7 +36,7 @@ module Arel
           end
 
           def dispatch
-            { Arel::Table.name => 'hello' }
+            { Arel::Table => 'hello' }
           end
         }.new