[GitHub] [arrow] mapleFU opened a new issue, #34660: [C++][Parquet] Decoder: support more DecodeArrow with nulls for `DeltaBitPack` and other decoder

["mapleFU (via GitHub)" <gi...@apache.org>]

mapleFU opened a new issue, #34660:
URL: https://github.com/apache/arrow/issues/34660

   ### Describe the enhancement requested
   
   Currently, some decoder doesn't support DecodeArrow, like:
   
   ```c++
     int DecodeArrow(int num_values, int null_count, const uint8_t* valid_bits,
                     int64_t valid_bits_offset,
                     typename EncodingTraits<DType>::Accumulator* out) override {
       if (null_count != 0) {
         ParquetException::NYI("Delta bit pack DecodeArrow with null slots");
       }
       std::vector<T> values(num_values);
       int decoded_count = GetInternal(values.data(), num_values);
       PARQUET_THROW_NOT_OK(out->AppendValues(values.data(), decoded_count));
       return decoded_count;
     }
   ```
   
   We need to add and test them later
   
   ### Component(s)
   
   C++, Parquet


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