SlowCompositeCodecReaderWrapper copies sub-vector values for thread-safety #14092
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…intain thread-safety
benchaplin
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Dec 31, 2024
…intain thread-safety (apache#14092)
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This was a bug introduced with #13779. I'm guessing it has been of no consequence because
SlowCompositeCodecReaderWrapperis normally only used by a single merge thread. However I came across test failures when working on reviving a vector-based binary-partitioning merge policy.