mapleFU commented on issue #15173:
URL: https://github.com/apache/arrow/issues/15173#issuecomment-1381335774
Reproduce the another problem with the code below:
```c++
void CheckRoundtripSpaced(const uint8_t* valid_bits,
int64_t valid_bits_offset) override {
auto encoder =
MakeTypedEncoder<Type>(Encoding::BYTE_STREAM_SPLIT, false,
descr_.get());
auto decoder = MakeTypedDecoder<Type>(Encoding::BYTE_STREAM_SPLIT,
descr_.get());
int null_count = 0;
for (auto i = 0; i < num_values_; i++) {
if (!bit_util::GetBit(valid_bits, valid_bits_offset + i)) {
null_count++;
}
}
encoder->PutSpaced(draws_, num_values_, valid_bits, valid_bits_offset);
encode_buffer_ = encoder->FlushValues();
decoder->SetData(num_values_, encode_buffer_->data(),
static_cast<int>(encode_buffer_->size()));
auto values_decoded = decoder->DecodeSpaced(decode_buf_, num_values_ -
null_count, null_count,
valid_bits,
valid_bits_offset);
ASSERT_EQ(num_values_ - null_count, values_decoded);
ASSERT_NO_FATAL_FAILURE(VerifyResultsSpaced<c_type>(
decode_buf_, draws_, num_values_ - null_count, valid_bits,
valid_bits_offset));
}
```
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