public Query In(string fieldName)
{
InQuery q = new InQuery(this._root ?? this, GetMethodInfo(fieldName));
NestedQueries.Add(q);
return(q);
}
public static SplitQuery <TKey, TRecord> Create <TKey, TRecord>(
InQuery <TKey, TRecord> query,
IProgress <ICollectionContext>?progress,
int maxConcurrency = 20
) =>