Parquet IO position invalid when writing integers

Please see https://github.com/apache/beam/blob/master/sdks/java/io/parquet/src/main/java/org/apache/beam/sdk/io/parquet/ParquetIO.java#L345

On write(int b), position is incremented by 1. On write(byte[] b, int off, int len) position is incremented by the length of the byte array.

write(int b) should increment by 4 bytes, if I'm understanding correctly.