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Re: Subquery with range uses filesort
Posted by: David Marcus
Date: December 22, 2013 10:45AM

> MySQL is internally structured such that the Parser, Optimizer, and
> a few more parts, are common code. The Engines (MyISAM, InnoDB,
> MEMORY) control the access to disk, etc.

That's what I would have thought. I was a bit confused by your saying
"Never mind -- don't file a bug report. You will get no sympathy since
you are not using InnoDB."

> A _correlated_ subquery cannot be turned directly into a JOIN. This
> is an SQL issue, not a MySQL issue.

Right. I knew that.

> Feel free to file a bug report about the poor performance.

Thank you. I'll do that.

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