@Override
    public byte[] readDecimal() {
      return super.validatedDecimal(valuesReader.readInteger());
    }
The reader who reads from the underlying int32 value value. Implementation is in consist with
ETypeConverter EINT32_CONVERTER

The data is read as integer from the reader, 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