Optimizes merge reservoirs in Fixed Sample Size. Instead of sampling from the reservoirs for each element, use one reservoir first such that we only need to sample once per merge. #680
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…from the reservoirs for each element, use one reservoir first such that we only need to sample once per merge. PiperOrigin-RevId: 753256165
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Optimizes merge reservoirs in Fixed Sample Size. Instead of sampling from the reservoirs for each element, use one reservoir first such that we only need to sample once per merge.