Commits on Jul 25, 2023

1. sql: error in cluster_logical_timestamp when not SERIALIZABLE …

   Previously, running `cluster_logical_timestamp` within an isolation
   level that tolerated write skew would result in an unhandled panic.
   
   This commit adds a gate at the SQL level that will instead return a
   FeatureNotSupported pgerror. This behavior may be permanent or may be
   removed once we determine how CommitTimestamp should function at these
   isolation levels.
   
   Epic:  CRDB-26546
   Part of: cockroachdb#103245
   Release note (sql change): cluster_logical_timestamp now returns an
   error when called at isolation levels lower than SERIALIZABLE.

   

   chrisseto committed Jul 25, 2023
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