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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Hash-join/OCaml/hash-join.ocaml Normal file
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let hash_join table1 f1 table2 f2 =
let h = Hashtbl.create 42 in
(* hash phase *)
List.iter (fun s ->
Hashtbl.add h (f1 s) s) table1;
(* join phase *)
List.concat (List.map (fun r ->
List.map (fun s -> s, r) (Hashtbl.find_all h (f2 r))) table2)