Commits on Nov 21, 2022

1. sql: add SHOW COMMIT TIMESTAMP to retrieve a causality token …

   Fixes cockroachdb#79591
   
   Relates to cockroachdb#7945
   
   Release note (sql change): A new sql statement `SHOW COMMIT TIMESTAMP` has been
   added. This statement can be used to retrieve the commit timestamp of the
   current explicit transaction, current multi-statement implicit transaction, or
   previous transaction. The statement may be used in a variety of settings to
   maximize its utility in the face of connection pooling.
   
   When used as a part of an explicit transaction, the statement implicitly
   commits the transaction internally before being able to return a causality
   token. This is similar to the `RELEASE cockroach_restart` behavior; after
   issuing this statement, commands to the transaction will be rejected until
   `COMMIT` is issued.
   
   When used as part of a multi-statement implicit transaction, the statement
   must be the final statement. If it occurs in the middle of a multi-statement
   implicit transaction, it will be rejected with an error.
   
   When sent as a stand-alone single-statement implicit transaction, it will
   return the commit timestamp of the previously committed transaction. If there
   was no transaction on the connection, or the previous transaction did not
   commit (either rolled back or encountered an error), the command will fail with
   an error code 25000 (`InvalidTransactionState`).

   

   ajwerner committed Nov 21, 2022
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