… pruning. Seems like this is being fixed in 5.6; not sure about Percona or MariaDB. (Re #4) There are _no_ parallel queries (within a single connection) anywhere in any ‘free’ variant of MySQL. PARTITIONs… PARTITIONing. I go into more details (and code) here: http://mysql.rjweb.org/doc.php/partitionmaint The third use case for…
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