Commits on Nov 10, 2021

1. spanconfig: introduce the spanconfig.SQLWatcher …

   This patch introduces the SQLWatcher, which is intended to incrementally
   watch for updates to system.zones and system.descriptors. It does so by
   establishing rangefeeds at a given timestamp.
   
   The SQLWatcher invokes a callback from time to time  with a list of
   updates that have been observed in the window
   (previous checkpointTS, checkpointTS]. The checkpointTS is also
   provided to the callback.
   
   Internally, the SQLWatcher uses a buffer to keep track of events
   generated by the SQLWatcher's rangefeeds. It also tracks the individual
   frontier timestamps of both the rangefeeds. This helps to maintain the
   notion of the combined frontier timestamp, which is computed as the
   minimum of the two. This combined frontier timestamp serves as the
   checkpoint to the SQLWatcher's callback function.
   
   This interface isn't hooked up to anything yet. It'll be used by the
   sponconfig.Reconciler soon to perform partial reconciliation once
   full reconciliation is done. It is intended that the IDs from the
   updates produced by the SQLWatcher will be fed into the SQLTranslator.
   
   References cockroachdb#67679
   Carved from cockroachdb#69661
   
   Release note: None

   

   arulajmani committed Nov 10, 2021
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