arrow-cpp v21.0.0

[regro-cf-autotick-bot]

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Pending Dependency Version Updates

Here is a list of all the pending dependency version updates for this repo. Please double check all dependencies before merging.

Name	Upstream Version	Current Version
azure-core-cpp	12.12.0
azure-identity-cpp	12.13.0
azure-storage-files-datalake-cpp	12.13.0

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[amoeba]

The failure here looks related to apache/arrow#45859:

2025-07-17T10:56:30.3038349Z $SRC_DIR/cpp/src/arrow/util/tracing_internal.cc:106:8: error: 'bool arrow::internal::tracing::{anonymous}::OtlpOStreamExporter::ForceFlush(std::chrono::microseconds)' cannot be overloaded with 'bool arrow::internal::tracing::{anonymous}::OtlpOStreamExporter::ForceFlush(std::chrono::microseconds)'
2025-07-17T10:56:30.3038921Z   106 |   bool ForceFlush(std::chrono::microseconds /*timeout*/) noexcept override {
2025-07-17T10:56:30.3039194Z       |        ^~~~~~~~~~
2025-07-17T10:56:30.3039575Z $SRC_DIR/cpp/src/arrow/util/tracing_internal.cc:101:8: note: previous declaration 'bool arrow::internal::tracing::{anonymous}::OtlpOStreamExporter::ForceFlush(std::chrono::microseconds)'
2025-07-17T10:56:30.3040022Z   101 |   bool ForceFlush(std::chrono::microseconds /*timeout*/) noexcept override {
2025-07-17T10:56:30.3040276Z       |        ^~~~~~~~~~

Looks like this is picking up a newer version of otel:

2025-07-17T10:46:41.1728460Z libopentelemetry_cpp:
2025-07-17T10:46:41.1728964Z - '1.21'

[h-vetinari]

Looks like this is picking up a newer version of otel:

2025-07-17T10:46:41.1728460Z libopentelemetry_cpp:
2025-07-17T10:46:41.1728964Z - '1.21'

We have no problems with that otel version for arrow v18+. In #1664, the error looked different; related to splitting of the compute library AFAIU.

[assignUser]

I think it's this PR that was only added to 21.0.0 and not present in 18.0.0. I assume the silent breaking change was reverted and that leads to this issue?

[h-vetinari]

I think it's this PR that was only added to 21.0.0 and not present in 18.0.0.

We've backported that patch to v19 and v20; I had misremembered when we introduced otel support in the builds here, that was only with v19, not v18.

[h-vetinari]

#1664 actually looks like it builds fine. I can update this PR if people are alright with the libarrow-compute changes there (and whether pyarrow-core should depend on it).

[amoeba]

Thanks @h-vetinari

[raulcd]

All green 🥳 ! Thanks for working on this @h-vetinari

[h-vetinari]

More importantly, the end-to-end testing in #1664 is also looking alright (i.e. among other things, the MSVC update in the images happened), so this is ready to go now. :)

[amoeba]

Thanks as always for the help @h-vetinari.