vl.product(field, as)
Specify a product aggregate operation.
product Method Overviewproduct API Reference# product.as(value)
The output field names to use for each aggregated field.
# product.field(value)
The data field for which to compute aggregate function. This is required for all aggregation operations except "count".
# product.op(value)
The aggregation operation to apply to the fields (e.g., "sum", "average", or "count"). See the full list of supported aggregation operations for more information.
# product.order(order)
Indicates the sort order. One of "ascending" or "descending". Only applicable if the operation is being used as a sort parameter.