/// <summary>
/// New value will be long.
/// </summary>
public static MemoryGroupByOperation AddLongSum(this MemoryGroupByOperation op, string sourceColumn, string targetColumn = null)
{
return(op.AddColumnAggregator((groupRows, col) => groupRows.Sum(x => x.GetAs(col, 0L)), sourceColumn, targetColumn));
}
/// <summary>
/// New value will be decimal.
/// </summary>
public static MemoryGroupByOperation AddDecimalAverage(this MemoryGroupByOperation op, string sourceColumn, string targetColumn = null)
{
return(op.AddColumnAggregator((groupRows, col) => groupRows.Average(x => x.GetAs(col, 0m)), sourceColumn, targetColumn));
}