private byte[] convertToBytes(int value) {
      return convertToBytes(convertToString(value));
    }
The reader who reads from the underlying decimal value which is stored in an INT32 physical type.

The data is read as INT32 from the reader treated as a decimal, then validated, converted
and returned as per the type defined in HMS.
ql/src/java/org/apache/hadoop/hive/ql/io/parquet/vector/ParquetDataColumnReaderFactory.java