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Re: Intermediate Query Results
Posted by: Rick James
Date: September 13, 2014 09:23PM

> but the requirement is to find all the plans that mysql has considered before selecting the best one

The optimizer takes various shortcuts. It starts with a huge tree of possible execution plans, but rapidly tosses large subtrees. (Without doing such, the optimization might take longer than executing the query!)

In newer versions of MySQL you can get more information via
EXPLAIN FORMAT=JSON SELECT ...

> Is it possible to access the intermediate results generated by mysql during execution of a query??

Probably nothing close to what you want.

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