comments and code rfactoring

Author: asmyasnikov

internal/table/scanner/result.go

@@ -163,6 +163,7 @@ func (r *unaryResult) NextResultSet(ctx context.Context, columns ...string) bool
 }
 
 func (r *streamResult) nextResultSetErr(ctx context.Context, columns ...string) (err error) {
+	// skipping second recv because first call of recv is from New Stream(), second call is from user
 	if r.nextResultSetCounter.Add(1) == 2 {
 		r.setColumnIndexes(columns)
 		return ctx.Err()

internal/table/session.go

@@ -990,7 +990,6 @@ func (s *session) StreamReadTable(
 	ctx, cancel := xcontext.WithCancel(ctx)
 
 	stream, err = s.tableService.StreamReadTable(ctx, &request)
-
 	if err != nil {
 		cancel()
 		return nil, xerrors.WithStackTrace(err)
@@ -1117,7 +1116,6 @@ func (s *session) StreamExecuteScanQuery(
 	ctx, cancel := xcontext.WithCancel(ctx)
 
 	stream, err = s.tableService.StreamExecuteScanQuery(ctx, &request, callOptions...)
-
 	if err != nil {
 		cancel()
 		return nil, xerrors.WithStackTrace(err)