public async Task <bool> MoveNextAsync(CancellationToken cancellation)
{
var row = _rowPool.Allocate();
var state = State.start;
while (state != State.end2)
{
if (_currentChunk == null)
{
_currentChunk = await _reader.ReadAsync(cancellation);
if (_currentChunk == null)
{
break;
}
}
state = Parse(state, row);
}
return(CompleteRead(row));
}