recordSummaryFunction smartgwt from backend

how to recordSummaryFunction smartgwt from backend

//$columnas_raw->type = 'integer';
if( $columna == "impressions" ){
$columnas_raw->recordSummaryFunction = "multiplier";
$columnas_raw->summaryFunction = "sum";
$columnas_raw->showGridSummary = true;
$columnas_raw->showGroupSummary= true;
}

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