presto-hive/src/main/java/io/prestosql/plugin/hive/RecordFileWriter.java/RecordFileWriter/appendRows
class RecordFileWriter:    @Override
    public void appendRows(Page dataPage)
    {
        for (int position = 0; position < dataPage.getPositionCount(); position++) {
            appendRow(dataPage, position);
        }
    }