// NOTE: increment line right away since we're now at the end
// of the preceding line.
line++;
if ( line % row_skip_mod == 0 ) {
row_index_map.put( line, in.position() );
// printRowIndexMap( "after add" );
if ( row_index_map.size() > max_index_size ) {
row_skip_mod = increaseRowSkipMod( row_skip_mod, line );
printRowIndexMap( "after grow" );