Re: avoiding temp/filesort for order by on child table
Obviously MySQL can't index across two tables, and materialising the join would cost performance ... beyond that without the DDL one can only guess, but there's obviously enough RAM for the filesort to happen in RAM so I doubt the filesort will significantly slow down your query.
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Re: avoiding temp/filesort for order by on child table
January 11, 2021 12:03PM
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