{"action":"created","comment":{"url":"https://api.github.com/repos/piwik/piwik/pulls/comments/90573595","pull_request_review_id":11093259,"id":90573595,"diff_hunk":"@@ -234,7 +234,13 @@ public function sortTablesForJoin($tA, $tB)\n             if (isset($tA['tableAlias']) && isset($tB['joinOn']) && strpos($tB['joinOn'], $tA['tableAlias']) !== false) {\n                 return -1;\n             }\n-            return 0;\n+\n+            $tA = $tA['table'];\n+            $tB = $tB['table'];\n+\n+            if ($tA === $tB) {\n+                return 1; // if both join same table keep order\n+            }","path":"core/DataAccess/LogQueryBuilder/JoinGenerator.php","position":11,"original_position":11,"commit_id":"3ffe8af8280a6cac3f40d06ed1fbe4ecf1430240","original_commit_id":"3ffe8af8280a6cac3f40d06ed1fbe4ecf1430240","user":{"login":"tsteur","id":273120,"avatar_url":"https://avatars.githubusercontent.com/u/273120?v=3","gravatar_id":"","url":"https://api.github.com/users/tsteur","html_url":"https://github.com/tsteur","followers_url":"https://api.github.com/users/tsteur/followers","following_url":"https://api.github.com/users/tsteur/following{/other_user}","gists_url":"https://api.github.com/users/tsteur/gists{/gist_id}","starred_url":"https://api.github.com/users/tsteur/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/tsteur/subscriptions","organizations_url":"https://api.github.com/users/tsteur/orgs","repos_url":"https://api.github.com/users/tsteur/repos","events_url":"https://api.github.com/users/tsteur/events{/privacy}","received_events_url":"https://api.github.com/users/tsteur/received_events","type":"User","site_admin":false},"body":"Maybe even better would be to look up the index in the array that is being sorted and simply always keep the order but this would mean we need to use a closure when sorting with `function ($tA, $tB) use ($tablesToBeSorted) `. Could do it but would mean a little refactoring","created_at":"2016-12-02T01:39:23Z","updated_at":"2016-12-02T01:39:24Z","html_url":"https://github.com/piwik/piwik/pull/10942#discussion_r90573595","pull_request_url":"https://api.github.com/repos/piwik/piwik/pulls/10942","_links":{"self":{"href":"https://api.github.com/repos/piwik/piwik/pulls/comments/90573595"},"html":{"href":"https://github.com/piwik/piwik/pull/10942#discussion_r90573595"},"pull_request":{"href":"https://api.github.com/repos/piwik/piwik/pulls/10942"}}},"pull_request":{"url":"https://api.github.com/repos/piwik/piwik/pulls/10942","id":96205874,"html_url":"https://github.com/piwik/piwik/pull/10942","diff_url":"https://github.com/piwik/piwik/pull/10942.diff","patch_url":"https://github.com/piwik/piwik/pull/10942.patch","issue_url":"https://api.github.com/repos/piwik/piwik/issues/10942","number":10942,"state":"open","locked":false,"title":"Fix a bug in query builder where tables are sorted randomly","user":{"login":"tsteur","id":273120,"avatar_url":"https://avatars.githubusercontent.com/u/273120?v=3","gravatar_id":"","url":"https://api.github.com/users/tsteur","html_url":"https://github.com/tsteur","followers_url":"https://api.github.com/users/tsteur/followers","following_url":"https://api.github.com/users/tsteur/following{/other_user}","gists_url":"https://api.github.com/users/tsteur/gists{/gist_id}","starred_url":"https://api.github.com/users/tsteur/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/tsteur/subscriptions","organizations_url":"https://api.github.com/users/tsteur/orgs","repos_url":"https://api.github.com/users/tsteur/repos","events_url":"https://api.github.com/users/tsteur/events{/privacy}","received_events_url":"https://api.github.com/users/tsteur/received_events","type":"User","site_admin":false},"body":"When we sort tables for join we should ideally not \"return 0\" because \"0\" means the sort order for tables will be different depending on the PHP version (PHP5 sorting vs PHP7 sorting). I have noticed a bug where it did sort the tables completely different on PHP5 vs PHP7 and then the query crashed because wrong tables were used first. \r\n\r\nBelow in `sortTablesForJoin` there is another `return 0` that we could remove and turn into a `return 1` but don't think it is needed for now.  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