Upgrade to WP4.2.1 fail

I fixed it.

Replace the line 40-41:

// SHOW INDEX emulation
		if( 0 === strpos( $sql, 'SHOW INDEX'))

to:

if ( 0 == strpos( $sql, 'SHOW FULL COLUMNS')) {
			$logto = 'SHOWCOLUMN';
			$pattern = '/SHOW FULL COLUMNS.+ [<code>]?(\w+)[</code>]?$/';
			preg_match($pattern, $sql, $matches);
			$table = $matches[1];
$sql = 'SELECT column_name as Field, data_type as Type, NULL as Collation, is_nullable as Null,
            \'\' as Key, \'\' as Default, \'\' as Extra, \'\' as Privileges, \'\' as Comment
            FROM information_schema.columns WHERE table_name =\''.$table.'\';';
        }
		// SHOW INDEX emulation
		elseif( 0 === strpos( $sql, 'SHOW INDEX'))

Now database upgraded successful.

Hi when i update to 4.2.1 i remplace that line but i have this error ! help me pls

Warning: pg_query(): Query failed: ERROR: missing FROM-clause entry for table “session” LINE 1: SELECT @@SESSION.sql_mode ^ in /home/wgcv/www/php/wordpress/wp-content/pg4wp/driver_pgsql.php on line 136
WordPress

Database Update Required

Warning: pg_query(): Query failed: ERROR: missing FROM-clause entry for table "session" LINE 1: SELECT @@SESSION.sql_mode ^ in /home/wgcv/www/php/wordpress/wp-content/pg4wp/driver_pgsql.php on line 136
WordPress

Catchable fatal error: Object of class WP_Error could not be converted to string in /home/wgcv/www/php/wordpress/wp-admin/includes/upgrade.php on line 1459