Problem with query on sqlsrv

We have a problem result of this query.
On this query we have 4 column on this have 3 don't have column name. (This is a problem), When we put the column name this return everything correct but when we don't column name don't return nothing.

On codeigniter have any workaround to put dynamically the name on columns? We collect this query to other system and is impossible make change on that.

$res = $this->DB2->query("SELECT cast(VENDAS_ANO_ATUAL as money),cast(VENDAS_ANO_ANTERIOR as money), cast(cast(CASE WHEN VENDAS_ANO_ANTERIOR = 0 THEN 0 ELSE ((VENDAS_ANO_ATUAL - VENDAS_ANO_ANTERIOR) / VENDAS_ANO_ANTERIOR) * 100 END as int) as varchar) + '%' AS PERCENTAGEM, case when VENDAS_ANO_ANTERIOR < VENDAS_ANO_ATUAL then '' else case when VENDAS_ANO_ANTERIOR> VENDAS_ANO_ATUAL then '' else '' end end FROM ( SELECT SUM(CASE WHEN Ano = YEAR(GETDATE()) THEN TotalLiqMBase ELSE 0 END) AS VENDAS_ANO_ATUAL, SUM(CASE WHEN Ano = YEAR(GETDATE())-1 THEN TotalLiqMBase ELSE 0 END) AS VENDAS_ANO_ANTERIOR FROM AcumuladosVendas (NOLOCK) JOIN DocumentosVenda ON DocumentosVenda.Documento=AcumuladosVendas.TipoDoc WHERE AcumuladosVendas.VENDEDOR IN (1) AND DocumentosVenda.TipoDocumento = 4 ) AS DATA")->result();

Thanks