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[C++] AsofJoinNode 128-bit hashing #32894

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A recent version of AsofJoinNode uses 64-bit hashing for by-key values. This leads to a non-negligible probability of collisions that are not arbitrated. Using 128-bit hashing, the probability will become negligible.

Reporter: Yaron Gvili / @rtpsw

Note: This issue was originally created as ARROW-17653. Please see the migration documentation for further details.

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