/// <summary>
/// Appends a $bucket stage to the pipeline.
/// </summary>
/// <typeparam name="TResult">The type of the result.</typeparam>
/// <typeparam name="TValue">The type of the value.</typeparam>
/// <param name="aggregate">The aggregate.</param>
/// <param name="groupBy">The expression providing the value to group by.</param>
/// <param name="boundaries">The bucket boundaries.</param>
/// <param name="options">The options.</param>
/// <returns>The fluent aggregate interface.</returns>
public static IAggregateFluent <AggregateBucketResult <TValue> > Bucket <TResult, TValue>(
this IAggregateFluent <TResult> aggregate,
Expression <Func <TResult, TValue> > groupBy,
IEnumerable <TValue> boundaries,
AggregateBucketOptions <TValue> options = null)
{
Ensure.IsNotNull(aggregate, nameof(aggregate));
return(aggregate.AppendStage(PipelineStageDefinitionBuilder.Bucket(groupBy, boundaries, options)));
}
