parquet-thrift/src/main/java/org/apache/parquet/thrift/BufferedProtocolReadToWrite.java
private void checkEnum(ThriftType expectedType, int i) {
    if (expectedType.getType() == ThriftTypeID.ENUM) {
      ThriftType.EnumType expectedEnumType = (ThriftType.EnumType)expectedType;
      if (expectedEnumType.getEnumValueById(i) == null) {
        throw new DecodingSchemaMismatchException("can not find index " + i + " in enum " + expectedType);
      }
    }
  }
private void checkEnum(ThriftType expectedType, int i) {
    if (expectedType.getType() == ThriftTypeID.ENUM) {
      ThriftType.EnumType expectedEnumType = (ThriftType.EnumType)expectedType;
      if (expectedEnumType.getEnumValueById(i) == null) {
        throw new DecodingSchemaMismatchException("can not find index " + i + " in enum " + expectedType);
      }
    }
  }
In thrift enum values are written as ints, this method checks if the enum index is defined.

@param expectedType
@param i