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kotlinlang

Hello guys! Just small and noob question, how can I retrieve the "sum" value in the result row when using groupBy?

For example like this:

```
ProductVo.slice(ProductVo.reference,ProductVo.quantity.sum())
                .selectAll()
                .groupBy(Prouct.reference)
 ```

I can retrieve productVo.reference with:
``` map { it[ProductVo.reference] }```

But no the "quantity sum" value, I've tested with alias but didn't work

I can get the value by using `data[1]` but... it's a workaround

`groupBy` is a map from key to list of values, you might want `associateBy`



```
val qSum = ProductVo.quantity.sum()
ProductVo.slice(ProductVo.reference, qSum)
                .selectAll()
                .groupBy(ProductVo.reference)
               .map{ it[qSum] }
 ```