Doctrine\ORM\Query\Parser::CaseExpression PHP Method

    public function CaseExpression()
    {
        // if "CASE" "WHEN" => GeneralCaseExpression
        // else if "CASE" => SimpleCaseExpression
        // else if "COALESCE" => CoalesceExpression
        // else if "NULLIF" => NullifExpression
        $this->semanticalError('CaseExpression not yet supported.');
    }