src/Manipulation/AbstractBaseQuery.php
public function where($whereOperator = 'AND')
    {
        if (!isset($this->where)) {
            $this->where = $this->filter();
        }

        $this->where->conjunction($whereOperator);

        return $this->where;
    }
public function where($whereOperator = 'AND')
    {
        if (!isset($this->where)) {
            $this->where = $this->filter();
        }

        $this->where->conjunction($whereOperator);

        return $this->where;
    }
@param string $whereOperator

@return Where