Log

def qapi = api.queryApi()
def t1 = qapi.tables().products()

def products = qapi.source(t1, [t1.sku(), t1.Costs, t1.label()], t1.Costs.greaterThan(40))
        .take(5)
        .stream { it.collect { it } }

return products.collect { row ->
    [
            ProductID    : row.sku,
            Label        : row.label,
            Costs        : row.Costs,
            "Log Costs": Math.log(row.Costs)
    ]
}