streams/Code/Update/_1208.php

<?php

namespace Code\Update;

class _1208
{

    public function run()
    {

        if (ACTIVE_DBTYPE == DBTYPE_POSTGRES) {
            $r1 = q("ALTER TABLE poll ADD poll_author text NOT NULL");
            $r2 = q("create index \"poll_author_idx\" on poll (\"poll_author\") ");

            $r = ($r1 && $r2);
        } else {
            $r = q("ALTER TABLE `poll` ADD `poll_author` VARCHAR(191) NOT NULL AFTER `poll_votes`, 
				ADD INDEX `poll_author` (`poll_author`)");
        }

        if ($r) {
            return UPDATE_SUCCESS;
        }
        return UPDATE_FAILED;
    }
}