mapleFU opened a new issue, #36939:
URL: https://github.com/apache/arrow/issues/36939
### Describe the bug, including details regarding any error messages,
version, and platform.
For `PlainEncoder<BooleanType>`:
1. For Encoding without arrow:
```c++
void PutSpaced(const bool* src, int num_values, const uint8_t* valid_bits,
int64_t valid_bits_offset) override {
if (valid_bits != NULLPTR) {
PARQUET_ASSIGN_OR_THROW(auto buffer,
::arrow::AllocateBuffer(num_values * sizeof(T),
this->memory_pool()));
T* data = reinterpret_cast<T*>(buffer->mutable_data());
int num_valid_values = ::arrow::util::internal::SpacedCompress<T>(
src, num_values, valid_bits, valid_bits_offset, data);
Put(data, num_valid_values);
} else {
Put(src, num_values);
}
}
```
If values contains null, this only puts length for `valid_bits`.
2. For Array
```c++
void Put(const ::arrow::Array& values) override {
if (values.type_id() != ::arrow::Type::BOOL) {
throw ParquetException("direct put to boolean from " +
values.type()->ToString() +
" not supported");
}
...
sink_.UnsafeAdvance(data.length());
}
```
This will always output the length with null. These two implement is
inconsistent.
### Component(s)
C++, Parquet
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