WL#4092: Remove ndb_use_exact_count and keep row count cache in mysqld
Affects: Server-7.1 — Status: In-Progress — Priority: Medium
Remove ndb_use_exact_count configuration option (and functionality) replacing with a cache in the ndbcluster storage engine kept up to date by the util thread. When Optimiser asks for row count, return this cache. Get rid of this silly "always return 100" thing except in some corner error cases.
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