1 files changed, 12 insertions, 5 deletions
diff --git a/lib/tuple.ml b/lib/tuple.ml
index 3c11fba..11fc508 100644
--- a/lib/tuple.ml
+++ b/lib/tuple.ml
@@ -1,18 +1,25 @@
-module AttributeMap = Map.Make(String)
+module AttributeMap = struct
+  include Map.Make(String)
+  let sexp_of_t sexp_of_v m =
+    Sexplib.Sexp.List
+      (List.map (fun (k, v) -> Sexplib.Sexp.List [Sexplib.Sexp.Atom k; sexp_of_v v])
+         (bindings m))
+end
 
 type non_materialized = {
   hash : Conventions.Hash.t;
   relation : Conventions.Name.t;
   attributes : Attribute.referenced AttributeMap.t;
-}
+} [@@deriving sexp_of]
 
 type materialized = {
   relation: Conventions.Name.t;
-  attributes: Attribute.materialized AttributeMap.t
-}
+  attributes: Attribute.materialized AttributeMap.t;
+} [@@deriving sexp_of]
 
-type t = 
+type t =
   | Materialized of materialized
   | NonMaterialized of non_materialized
+[@@deriving sexp_of]
 
 let make_materialized ~relation ~attributes = Materialized { relation; attributes }