/// <summary>
/// Calculates count of elements of provided <paramref name="provider"/>.
/// </summary>
/// <param name="provider">The provider.</param>
/// <param name="session">The session.</param>
public static long Count(this CompilableProvider provider, Session session)
{
return(provider
.Aggregate(null, new AggregateColumnDescriptor("$Count", 0, AggregateType.Count))
.GetRecordSet(session)
.First()
.GetValue <long>(0));
}
/// <summary>
/// Calculates count of elements of provided <paramref name="provider"/>.
/// </summary>
/// <param name="provider">The provider.</param>
/// <param name="session">The session.</param>
public static long Count(this CompilableProvider provider, Session session)
{
ArgumentValidator.EnsureArgumentNotNull(provider, nameof(provider));
ArgumentValidator.EnsureArgumentNotNull(session, nameof(session));
using var recordSetReader = provider
.Aggregate(null, new AggregateColumnDescriptor("$Count", 0, AggregateType.Count))
.GetRecordSetReader(session, new ParameterContext());
return(recordSetReader.MoveNext() && recordSetReader.Current != null
? recordSetReader.Current.GetValue <long>(0)
: throw new InvalidOperationException("Sequence contains no elements."));
}
