/// <summary>
/// Creates a dictionary of simulated results for a metric function.
/// Returns a dictionary of keys=>result
/// </summary>
public static IDictionary <string, SimulatedMetricFunctionInfo> CreateSimulatedLoockup <T>(ITable sourceTable, IList <IRow> rows, int targetColumn, IHistogram <T> histogram, Func <IRow, TimeSpan> durationFunc)
{
var sourceCol = sourceTable.Columns[targetColumn];
return(rows.GroupBy(r => r.Rows[targetColumn])
.Where(g => histogram.ContainsKey((T)sourceCol[g.Key]))
.SelectMany(g => GetSimulatedMetricFunctionInfo(sourceTable, g.ToList(), histogram[(T)sourceCol[g.Key]], durationFunc))
.ToDictionary(kv => kv.Key, kv => kv.Value));
}