From c67ed574a7a95db73d9349d58727452850bd47b9 Mon Sep 17 00:00:00 2001
From: Marcos Magueta <maguetamarcos@gmail.com>
Date: Sun, 8 Dec 2024 15:00:31 -0300
Subject: planner seq scan assuming ordering of results

---
 lib/planner.ml | 12 +++++++++++-
 lib/schema.ml  |  4 ++--
 2 files changed, 13 insertions(+), 3 deletions(-)

(limited to 'lib')

diff --git a/lib/planner.ml b/lib/planner.ml
index ceaf815..b88090d 100644
--- a/lib/planner.ml
+++ b/lib/planner.ml
@@ -1,7 +1,17 @@
 module Scan = struct
   open Disk
   let execute commit locations (entity: string) =
-    Executor.read commit locations ~filename:entity
+    let binary = Executor.read commit locations ~filename:("schema~" ^ entity) in
+    let relation =
+      Result.map_error (fun _ -> "Failed to deserialize relation from binary format.")
+      @@ Data_encoding.Binary.of_bytes Schema.Protocol.relation_encoding (Bytes.concat Bytes.empty binary) in
+    match relation with
+    | Ok relation ->
+       begin
+         let attrs = List.map (fun (a: Schema.Protocol.attribute) -> relation.name ^ "/" ^ a.name) relation.attributes in
+         Executor.read commit locations ~filename:("schema~" ^ entity)
+       end
+    | Error err -> failwith err
 end
 
 module Join = struct
diff --git a/lib/schema.ml b/lib/schema.ml
index 74ce720..81632b4 100644
--- a/lib/schema.ml
+++ b/lib/schema.ml
@@ -38,7 +38,7 @@ let test_schema_write_and_retrieve() =
   let locations: Executor.locations = Executor.StringMap.empty in
   let open Extensions.Result in
   let+ user_relation =
-    let relation: Protocol.relation = { name = "user"; attributes = [{name = "first-name"; attr_type = "string"}; {name = "last-name"; attr_type = "string"}] } in
+    let relation: Protocol.relation = { name = "schema~user"; attributes = [{name = "first-name"; attr_type = "string"}; {name = "last-name"; attr_type = "string"}] } in
     Result.map_error (fun _ -> "Failed to serialize relation to binary format.")
         @@ Binary.to_bytes Protocol.relation_encoding relation
   in
@@ -46,7 +46,7 @@ let test_schema_write_and_retrieve() =
     {kind = Command.WRITE; timestamp = 10.0; hash = ""; content = Bytes.to_string user_relation; filename = "user"; references = []} in
   let+ ((stream, locations), Command.ComputedHash handle) = Command.commit_and_perform stream locations command_write in
   let command_read: Command.t =
-    {kind = Command.READ; timestamp = 10.0; hash = handle; content = ""; filename = "user"; references = []} in
+    {kind = Command.READ; timestamp = 10.0; hash = handle; content = ""; filename = "schema~user"; references = []} in
   let+ ((stream, locations), Command.Read content) = Command.commit_and_perform stream locations command_read in
   let+ user_relation =
     Result.map_error (fun _ -> "Failed to deserialize relation from binary format.")
-- 
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