functions/merge_players.sql

   1 create or replace function merge_players(p_winner_player_id players.player_id%TYPE, p_loser_player_id players.player_id%TYPE) RETURNS void as
   2 $$
   3 declare
   4    rowcount integer;
   5    weighted_elo record;
   6 begin
   7    -- start with weapon stats
   8    update player_weapon_stats
   9    set player_id = p_winner_player_id
  10    where player_id = p_loser_player_id;
  11
  12    get diagnostics rowcount = ROW_COUNT;
  13    raise notice '% weapon stat rows updated.', rowcount;
  14
  15    -- then game stats
  16    update player_game_stats
  17    set player_id = p_winner_player_id
  18    where player_id = p_loser_player_id;
  19
  20    get diagnostics rowcount = ROW_COUNT;
  21    raise notice '% game stat rows updated.', rowcount;
  22
  23    -- copy player_elos entries that don't currently exist for the winner
  24    insert into xonstat.player_elos
  25    select p_winner_player_id, game_type_cd, games, elo from xonstat.player_elos pe
  26    where player_id = p_loser_player_id
  27    and not exists (select 1 from xonstat.player_elos where player_id = p_winner_player_id and game_type_cd = pe.game_type_cd);
  28
  29    -- take the weighted average of the elos and sum the games to get the new total
  30    FOR weighted_elo IN (select game_type_cd, elo_sum/game_count aggregate_elo, game_count
  31       from (
  32          select game_type_cd, sum(games*elo) elo_sum, sum(games) game_count
  33          from player_elos
  34          where player_id in (p_winner_player_id, p_loser_player_id)
  35          group by game_type_cd
  36       ) es)
  37    LOOP
  38       update xonstat.player_elos
  39       set elo = weighted_elo.aggregate_elo, games = weighted_elo.game_count
  40       where player_id = p_winner_player_id
  41       and game_type_cd = weighted_elo.game_type_cd;
  42
  43       raise notice 'New % Elo is %.', weighted_elo.game_type_cd, weighted_elo.aggregate_elo;
  44    END LOOP;
  45
  46    -- update the existing player_elos entries that have a higher elo on the loser
  47    -- update xonstat.player_elos pe
  48    -- set elo = newpe.elo
  49    -- from
  50       -- (select lpe.game_type_cd, lpe.elo
  51       -- from xonstat.player_elos wpe, xonstat.player_elos lpe
  52       -- where wpe.game_type_cd = lpe.game_type_cd
  53       -- and wpe.player_id = 67
  54       -- and lpe.player_id = 720
  55       -- and lpe.elo > wpe.elo) newpe
  56    -- where player_id = 67
  57    -- and pe.game_type_cd = newpe.game_type_cd;
  58
  59    -- then hashkeys (winner takes the loser's hashkey)
  60    update hashkeys
  61    set player_id = p_winner_player_id
  62    where player_id = p_loser_player_id;
  63
  64    get diagnostics rowcount = ROW_COUNT;
  65    raise notice '% hashkeys copied.', rowcount;
  66
  67    -- and finally deactivate the old player record
  68    update players set active_ind = false where player_id = p_loser_player_id;
  69 end;
  70 $$
  71 language plpgsql;