1 files changed, 51 insertions, 0 deletions
diff --git a/lib/arel/engines/sql/predicates.rb b/lib/arel/engines/sql/predicates.rb
new file mode 100644
index 0000000000..b84c183c1d
--- /dev/null
+++ b/lib/arel/engines/sql/predicates.rb
@@ -0,0 +1,51 @@
+module Arel
+  class Binary < Predicate
+    def to_sql(formatter = nil)
+      "#{operand1.to_sql} #{predicate_sql} #{operand1.format(operand2)}"
+    end
+  end
+
+  class CompoundPredicate < Binary
+    def to_sql(formatter = nil)
+      "(#{operand1.to_sql(formatter)} #{predicate_sql} #{operand2.to_sql(formatter)})"
+    end
+  end
+
+  class Or < CompoundPredicate
+    def predicate_sql; "OR" end
+  end
+
+  class And < CompoundPredicate
+    def predicate_sql; "AND" end
+  end
+
+  class Equality < Binary
+    def predicate_sql
+      operand2.equality_predicate_sql
+    end
+  end
+
+  class GreaterThanOrEqualTo < Binary
+    def predicate_sql; '>=' end
+  end
+
+  class GreaterThan < Binary
+    def predicate_sql; '>' end
+  end
+
+  class LessThanOrEqualTo < Binary
+    def predicate_sql; '<=' end
+  end
+
+  class LessThan < Binary
+    def predicate_sql; '<' end
+  end
+
+  class Match < Binary
+    def predicate_sql; 'LIKE' end
+  end
+
+  class In < Binary
+    def predicate_sql; operand2.inclusion_predicate_sql end
+  end
+end