4 files changed, 32 insertions, 0 deletions
diff --git a/lib/arel/engines/sql/extensions/array.rb b/lib/arel/engines/sql/extensions/array.rb
new file mode 100644
index 0000000000..1daa5abca7
--- /dev/null
+++ b/lib/arel/engines/sql/extensions/array.rb
@@ -0,0 +1,9 @@
+class Array
+  def to_sql(formatter = nil)
+    "(" + collect { |e| e.to_sql(formatter) }.join(', ') + ")"
+  end
+
+  def inclusion_predicate_sql
+    "IN"
+  end
+end
+\ No newline at end of file
diff --git a/lib/arel/engines/sql/extensions/nil_class.rb b/lib/arel/engines/sql/extensions/nil_class.rb
new file mode 100644
index 0000000000..729c4cada7
--- /dev/null
+++ b/lib/arel/engines/sql/extensions/nil_class.rb
@@ -0,0 +1,5 @@
+class NilClass
+  def equality_predicate_sql
+    'IS'
+  end
+end
+\ No newline at end of file
diff --git a/lib/arel/engines/sql/extensions/object.rb b/lib/arel/engines/sql/extensions/object.rb
new file mode 100644
index 0000000000..ef990eee2f
--- /dev/null
+++ b/lib/arel/engines/sql/extensions/object.rb
@@ -0,0 +1,9 @@
+class Object
+  def to_sql(formatter)
+    formatter.scalar self
+  end
+
+  def equality_predicate_sql
+    '='
+  end
+end
+\ No newline at end of file
diff --git a/lib/arel/engines/sql/extensions/range.rb b/lib/arel/engines/sql/extensions/range.rb
new file mode 100644
index 0000000000..d7329efe34
--- /dev/null
+++ b/lib/arel/engines/sql/extensions/range.rb
@@ -0,0 +1,9 @@
+class Range
+  def to_sql(formatter = nil)
+    formatter.range self.begin, self.end
+  end
+  
+  def inclusion_predicate_sql
+    "BETWEEN"
+  end
+end
+\ No newline at end of file