object(PDOException)#11 (10) {
  ["message":protected]=>
  string(326) "SQLSTATE[42883]: Undefined function: 7 ERROR:  function substring_index(character varying, unknown, integer) does not exist
LINE 1: SELECT DISTINCT SUBSTRING_INDEX(source, '/', 1) AS path FROM...
                        ^
HINT:  No function matches the given name and argument types. You might need to add explicit type casts."
  ["string":"Exception":private]=>
  string(0) ""
  ["code":protected]=>
  string(5) "42883"
  ["file":protected]=>
  string(64) "/Applications/MAMP/htdocs/drupal7/includes/database/database.inc"
  ["line":protected]=>
  int(2039)
  ["trace":"Exception":private]=>
  array(10) {
    [0]=>
    array(6) {
      ["file"]=>
      string(64) "/Applications/MAMP/htdocs/drupal7/includes/database/database.inc"
      ["line"]=>
      int(2039)
      ["function"]=>
      string(7) "execute"
      ["class"]=>
      string(12) "PDOStatement"
      ["type"]=>
      string(2) "->"
      ["args"]=>
      array(1) {
        [0]=>
        array(0) {
        }
      }
    }
    [1]=>
    array(6) {
      ["file"]=>
      string(70) "/Applications/MAMP/htdocs/drupal7/includes/database/pgsql/database.inc"
      ["line"]=>
      int(83)
      ["function"]=>
      string(7) "execute"
      ["class"]=>
      string(21) "DatabaseStatementBase"
      ["type"]=>
      string(2) "->"
      ["args"]=>
      array(2) {
        [0]=>
        array(0) {
        }
        [1]=>
        array(4) {
          ["target"]=>
          string(7) "default"
          ["fetch"]=>
          int(5)
          ["return"]=>
          int(1)
          ["throw_exception"]=>
          bool(true)
        }
      }
    }
    [2]=>
    array(6) {
      ["file"]=>
      string(64) "/Applications/MAMP/htdocs/drupal7/includes/database/database.inc"
      ["line"]=>
      int(2218)
      ["function"]=>
      string(5) "query"
      ["class"]=>
      string(24) "DatabaseConnection_pgsql"
      ["type"]=>
      string(2) "->"
      ["args"]=>
      array(3) {
        [0]=>
        string(72) "SELECT DISTINCT SUBSTRING_INDEX(source, '/', 1) AS path FROM {url_alias}"
        [1]=>
        array(0) {
        }
        [2]=>
        array(1) {
          ["target"]=>
          string(7) "default"
        }
      }
    }
    [3]=>
    array(4) {
      ["file"]=>
      string(51) "/Applications/MAMP/htdocs/drupal7/includes/path.inc"
      ["line"]=>
      int(381)
      ["function"]=>
      string(8) "db_query"
      ["args"]=>
      array(1) {
        [0]=>
        string(72) "SELECT DISTINCT SUBSTRING_INDEX(source, '/', 1) AS path FROM {url_alias}"
      }
    }
    [4]=>
    array(4) {
      ["file"]=>
      string(51) "/Applications/MAMP/htdocs/drupal7/includes/path.inc"
      ["line"]=>
      int(70)
      ["function"]=>
      string(35) "drupal_path_alias_whitelist_rebuild"
      ["args"]=>
      array(0) {
      }
    }
    [5]=>
    array(4) {
      ["file"]=>
      string(51) "/Applications/MAMP/htdocs/drupal7/includes/path.inc"
      ["line"]=>
      int(264)
      ["function"]=>
      string(18) "drupal_lookup_path"
      ["args"]=>
      array(3) {
        [0]=>
        string(6) "source"
        [1]=>
        string(10) "update.php"
        [2]=>
        NULL
      }
    }
    [6]=>
    array(4) {
      ["file"]=>
      string(51) "/Applications/MAMP/htdocs/drupal7/includes/path.inc"
      ["line"]=>
      int(18)
      ["function"]=>
      string(22) "drupal_get_normal_path"
      ["args"]=>
      array(1) {
        [0]=>
        string(10) "update.php"
      }
    }
    [7]=>
    array(4) {
      ["file"]=>
      string(53) "/Applications/MAMP/htdocs/drupal7/includes/common.inc"
      ["line"]=>
      int(4918)
      ["function"]=>
      string(22) "drupal_path_initialize"
      ["args"]=>
      array(0) {
      }
    }
    [8]=>
    array(4) {
      ["file"]=>
      string(56) "/Applications/MAMP/htdocs/drupal7/includes/bootstrap.inc"
      ["line"]=>
      int(2056)
      ["function"]=>
      string(22) "_drupal_bootstrap_full"
      ["args"]=>
      array(0) {
      }
    }
    [9]=>
    array(4) {
      ["file"]=>
      string(44) "/Applications/MAMP/htdocs/drupal7/update.php"
      ["line"]=>
      int(385)
      ["function"]=>
      string(16) "drupal_bootstrap"
      ["args"]=>
      array(1) {
        [0]=>
        int(7)
      }
    }
  }
  ["previous":"Exception":private]=>
  NULL
  ["errorInfo"]=>
  array(3) {
    [0]=>
    string(5) "42883"
    [1]=>
    int(7)
    [2]=>
    string(287) "ERROR:  function substring_index(character varying, unknown, integer) does not exist
LINE 1: SELECT DISTINCT SUBSTRING_INDEX(source, '/', 1) AS path FROM...
                        ^
HINT:  No function matches the given name and argument types. You might need to add explicit type casts."
  }
  ["query_string"]=>
  string(72) "SELECT DISTINCT SUBSTRING_INDEX(source, '/', 1) AS path FROM {url_alias}"
  ["args"]=>
  array(0) {
  }
}