src/Server/Asyn/Mysql/Miner.php
private function openCriteria(array &$criteria, $connector = self::LOGICAL_AND)
    {
        $criteria[] = array('bracket' => self::BRACKET_OPEN,
            'connector' => $connector);

        return $this;
    }
private function openCriteria(array &$criteria, $connector = self::LOGICAL_AND)
    {
        $criteria[] = array('bracket' => self::BRACKET_OPEN,
            'connector' => $connector);

        return $this;
    }
private function openCriteria ( array & $ criteria , $ connector = self :: LOGICAL_AND ) { $ criteria [ ] = array ( 'bracket' => self :: BRACKET_OPEN , 'connector' => $ connector ) ; return $ this ; }
Add an open bracket for nesting conditions to the specified WHERE or
HAVING criteria.

@param  array $criteria WHERE or HAVING criteria
@param  string $connector optional logical connector, default AND
@return Miner
Add an open bracket for nesting conditions to the specified WHERE or HAVING criteria .