GH-46748: [C++] Initial port on AIX#46749

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ranjitshs wants to merge 4 commits intoapache:mainfrom

ranjitshs:aix-compilation-fix

Commits on Jun 9, 2025

Initial port on AIX
ranjitshs
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Commits on Jun 10, 2025

Commits on Jun 12, 2025

using int64_t instead of long
ranjitshs
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