Antoine Pitrou comments

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                                            Antoine Pitrou

GH-32276: [C++][FlightRPC] Align RecordBatch buffers given to IPC

Thanks @EnricoMi . This looks good to me except for the nit above.

botocore no longer populates the `Content-MD5` header leading to `MissingContentMD5` error

Upstream Minio issue: https://github.com/minio/minio/issues/20845

GH-34785: [C++][Parquet] Parquet Bloom Filter Writer Implementation

Hi @mapleFU, I plan to take a look next week, does that sound acceptable?

GH-34785: [C++][Parquet] Parquet Bloom Filter Writer Implementation

@mapleFU Do you want to revive this?

[C++] Add tests for HalfFloatScalar

@dinse I don't know if you're interested in this.

[ENH] Add support for C++11 `std::array`

Does Cython support variadic template or placeholder template parameters? If so, `std::array` could be declared as `array[T, ...]`.

BUG: Importing Numpy very CPU-intensive with non-small thread count

It seems to be a regression in 2.0 actually: ```console $ pip install "numpy

BUG: Importing Numpy very CPU-intensive with non-small thread count

I've edited the title and description to reflect the fact that this is _CPU time_, not wall clock time. But still :-)

BUG: Importing Numpy very CPU-intensive with non-small thread count

Each thread seems to consume literally 40-50 ms of CPU time: ```console $ OMP_NUM_THREADS=1 \time python -c "import numpy" 0.04user 0.01system 0:00.05elapsed 100%CPU (0avgtext+0avgdata 25812maxresident)k 0inputs+0outputs (0major+3471minor)pagefaults 0swaps $ OMP_NUM_THREADS=2...

BUG: Importing Numpy very CPU-intensive with non-small thread count

I wonder what takes so much time. In Arrow we don't even launch our worker threads before there's actual usage requiring them.