private void BuildSingleEnumColumnDictionary(CancellationToken cancellationToken)
{
// Build a CountAggregator for the enum GroupBy
CountAggregator counts = new CountAggregator();
XArray values = _column.ValuesGetter()();
Func <XArray> indicesGetter = _column.IndicesCurrentGetter();
int count;
while ((count = _source.Next(XTableExtensions.DefaultBatchSize, cancellationToken)) != 0)
{
// Aggregate each row directly on the row index (already a small zero-based value)
XArray indices = indicesGetter();
counts.Add(indices, values.Count);
}
// Once the loop is done, get the distinct values and aggregation results
PostSortAndFilter(values, counts.Values, counts.TotalRowCount, true);
}
