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A comment on Writing a MySQL storage engine from scratch (2016). Parent comment

Re:Writing a MySQL storage engine from scratch (2016) by morgo on Thursday June 15, 2017 @06:38AM (#14559189)
It has been able to use more than one index per table since MySQL 5.0 (2005):

https://dev.mysql.com/doc/refman/5.7/en/index-merge-optimiza...

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