Commits on Jun 8, 2022

1. storage: add MVCC point synthesizing iterator …

   This patch adds `pointSynthesizingIter`, an MVCC iterator which wraps an
   arbitrary MVCC iterator and synthesizes point keys for range keys at
   their start key and where they overlap point keys. It can optionally
   synthesize around the SeekGE seek key too, which is useful for point
   operations like `MVCCGet` where we may want to return a synthetic
   tombstone for an MVCC range tombstone if there is no existing point key.
   
   This will primarily be used to handle MVCC range tombstones in MVCC
   scans and gets, as well as during MVCC conflict checks, which allows
   much of this logic to remain unchanged and simplified (in particular,
   `pebbleMVCCScanner` will not need any changes).
   
   However, this patch does not make use of the iterator yet, since both it
   and Pebble will need further performance optimizations for use in hot
   paths. For now, correctness is sufficient, and only basic attempts at
   performance optimization have been made.
   
   Release note: None

   

   erikgrinaker committed Jun 8, 2022
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