5 files changed, 16 insertions, 0 deletions
diff --git a/lib/arel/visitors/depth_first.rb b/lib/arel/visitors/depth_first.rb
index 24c435ad1d..2894bea19c 100644
--- a/lib/arel/visitors/depth_first.rb
+++ b/lib/arel/visitors/depth_first.rb
@@ -161,6 +161,7 @@ module Arel
       def visit_Array o
         o.each { |i| visit i }
       end
+      alias :visit_Set :visit_Array
 
       def visit_Hash o
         o.each { |k,v| visit(k); visit(v) }
diff --git a/lib/arel/visitors/dot.rb b/lib/arel/visitors/dot.rb
index 8a83ebf48e..9bf9f88d18 100644
--- a/lib/arel/visitors/dot.rb
+++ b/lib/arel/visitors/dot.rb
@@ -212,6 +212,7 @@ module Arel
           edge(i) { visit x }
         end
       end
+      alias :visit_Set :visit_Array
 
       def visit_edge o, method
         edge(method) { visit o.send(method) }
diff --git a/lib/arel/visitors/to_sql.rb b/lib/arel/visitors/to_sql.rb
index a350daa3da..6dd652a709 100644
--- a/lib/arel/visitors/to_sql.rb
+++ b/lib/arel/visitors/to_sql.rb
@@ -477,6 +477,7 @@ key on UpdateManager using UpdateManager#key=
       def visit_Array o
         o.map { |x| visit x }.join(', ')
       end
+      alias :visit_Set :visit_Array
 
       def quote value, column = nil
         @connection.quote value, column
diff --git a/test/visitors/test_depth_first.rb b/test/visitors/test_depth_first.rb
index 05360ff6e8..38d12b487c 100644
--- a/test/visitors/test_depth_first.rb
+++ b/test/visitors/test_depth_first.rb
@@ -1,4 +1,5 @@
 require 'helper'
+require 'set'
 
 module Arel
   module Visitors
@@ -159,6 +160,13 @@ module Arel
         assert_equal [:a, :b, node, list], @collector.calls
       end
 
+      def test_set
+        node = Nodes::Or.new(:a, :b)
+        set  = Set.new([node])
+        @visitor.accept set
+        assert_equal [:a, :b, node, set], @collector.calls
+      end
+
       def test_hash
         node = Nodes::Or.new(:a, :b)
         hash = { node => node }
diff --git a/test/visitors/test_to_sql.rb b/test/visitors/test_to_sql.rb
index 1caedacd45..2164e68cb7 100644
--- a/test/visitors/test_to_sql.rb
+++ b/test/visitors/test_to_sql.rb
@@ -1,4 +1,5 @@
 require 'helper'
+require 'set'
 
 module Arel
   module Visitors
@@ -114,6 +115,10 @@ module Arel
         @visitor.accept({:a => 1})
       end
 
+      it "should visit_Set" do
+        @visitor.accept Set.new([1, 2])
+      end
+
       it "should visit_BigDecimal" do
         @visitor.accept BigDecimal.new('2.14')
       end