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87303: kvserver,storage: calculate GCBytesAge in AddSSTable for points r=erikginaker a=itsbilal Currently, the stats calculations in `AddSSTable` and `CheckSSTConflicts` does not adjust for any GCBytesAge differences that arise from sst keys deleting or shadowing engine keys. This results in mismatching GCBytesAge values if we were to run the existing TestEvalAddSSTable test with sufficiently-large "now" timestamps to accrue GCBytesAge. This change updates TestEvalAddSSTable to multiply each timestamp with 1e9 so that it operates in full-second increments to see more interesting GCBytesAge behaviour. It also updates the code path where we mass-update SST timestamps to make the corresponding GCBytesAge adjustment. Finally, it ensures that GCBytesAge is accrued from the right timestamps in cases of sst keys / tombstones shadowing engine keys / tombstones. Note that this change only fixes GCBytesAge for point keys; a fix for range keys will come in a follow-up. Fixes #82920. Release note: None. Co-authored-by: Bilal Akhtar <[email protected]>
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