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db: Avoiding checking bloom filters during compaction
Checking bloom filters of sstables to compute max purgeable timestamp for compaction is expensive in terms of CPU time. We can avoid calculating it if we're not about to GC any tombstone. This patch changes compacting functions to accept a function instead of ready value for max_purgeable. I verified that bloom filter operations no longer appear on flame graphs during compaction-heavy workload (without tombstones). Refs scylladb#1322.
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