Commits on Feb 14, 2021

1. colmem: limit batches of dynamic size by workmem in memory footprint …

   This commit adds a minor improvement to `ResetMaybeReallocate` method so
   that it reuses the old batch (without doubling the capacity and
   allocating a new batch) when the old batch has enough capacity and
   reached the provided limit in size. This change effectively allows us to
   limit all batches flowing through the vectorized engine by `workmem`
   setting in size since the main batch-producers (cfetcher and
   columnarizer) use this method.
   
   Release note (sql change): Most batches of data flowing through the
   vectorized execution engine will now be limited in size by
   `sql.distsql.temp_storage.workmem` (64MiB by default) which should
   improve the stability of CockroachDB clusters.

   

   yuzefovich committed Feb 14, 2021
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