src/Phossa/Query/Clause/OnDupTrait.php
protected function buildOnDup()/*# : array */
    {
        $result = [];
        foreach ($this->clause_ondup as $col => $expr) {
            $result[] = $col . ' = ' . $expr;
        }
        return $result;
    }
protected function buildOnDup()/*# : array */
    {
        $result = [];
        foreach ($this->clause_ondup as $col => $expr) {
            $result[] = $col . ' = ' . $expr;
        }
        return $result;
    }
Build ON DUP

@return array
@access protected