decimalGroupAgg

Series decimalGroupAgg(string agg)(string outName,  Series col,
       size_t[][]  groupRows)

The per-group decimal aggregation over group row lists: sum (the checked row-order fold), min/max (coefficient compare - one scale per column), first/last (the first/last row when valid, else null), count (valid rows). One DECIMAL slot per group (count: one uint slot).

Parameters

`agg`	`"sum"`, `"min"`, `"max"`, `"first"`, `"last"` or `"count"`
`outName`	the output column name
`col`	the DECIMAL value column
`groupRows`	the per-group row lists

Returns

the aggregated Series.

Throws

DataFrameException on a group's sum overflow.