Commits on Sep 19, 2018

1. changefeedccl: support tables with more than one column family …

   If a table has multiple column families and only one of them is changed
   in a given statement, only the kv for that column family will be changed
   by the sql system. This means we wouldn't have enough data to
   reconstruct the row.
   
   We can fetch the row's entire kv data with a prefix scan that's forced
   to be at the timestamp of the changed kv. This has two issues
   
   - it introduces a blocking kv read (in the common case, this is not as
     bad as it sounds since this code is likely running on the leaseholder
     and the data can be served locally)
   - if N column families were updated at once, then we'll run this process
     N times and get N exact duplicates in the output
   
   Release note (enterprise change): CHANGEFEEDs now support tables with
   multiple column families, though with degraded performance.
   
   Closes cockroachdb#28667

   

   danhhz committed Sep 19, 2018
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