Added query to include old ladder games in win ratio calculation

Author: Askaholic

migrations/V67__add-old-ladder-games-to-winratio.sql

@@ -0,0 +1,52 @@
+-- Updates numGames and winGames on the ladder1v1_rating table based on
+-- aggregated results from old ladder games.
+
+-- NOTE: If running this manually, this query will increment the existing values,
+-- it will not start from 0. Run V65__fix-ladder-win-ratio.sql first to
+-- initialize the count correctly.
+--
+-- Old ladder games are ones that happened before the 'ladder1v1' game mode
+-- was added. This means we need to identify them as best we can using other
+-- properties:
+--
+--      Name: always 'Player1 Vs Player2'
+--      Number of players: 2 (always human)
+--      Color: red or blue (1 or 2)
+--      Score: always 1 (win), 0 (loss), or -1 (draw or no result)
+--      Start Time: Before the first 'ladder1v1' game
+--
+-- We perform the player count twice, once with additional filters and once
+-- without in order to verify that there are exactly 2 players and they also
+-- fullfill the additional requirements.
+
+UPDATE ladder1v1_rating
+INNER JOIN (
+    SELECT
+        count(score) numGames,
+        sum(case when score = 1 then 1 else 0 end) winGames,
+        game_player_stats.playerId playerId
+    FROM game_stats
+        INNER JOIN game_player_stats on game_stats.id = game_player_stats.gameId
+    WHERE
+        gameMod=0 AND
+        startTime < '2014-03-22 12:59:25' AND
+        gameName collate latin1_general_cs LIKE '% Vs %' AND
+        (
+            SELECT count(*) FROM game_player_stats
+                WHERE gameId = game_stats.id
+        ) = 2
+        AND
+        (
+            SELECT count(*) FROM game_player_stats
+                WHERE gameId = game_stats.id AND
+                AI = 0 AND
+                color IN (1, 2) AND
+                score in (-1, 0, 1)
+        ) = 2
+    GROUP BY game_player_stats.playerId
+) game_records
+ON ladder1v1_rating.id = game_records.playerId
+SET
+    ladder1v1_rating.numGames = ladder1v1_rating.numGames + game_records.numGames,
+    ladder1v1_rating.winGames = ladder1v1_rating.winGames + game_records.winGames
+;