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MySQL Internals Manual :: 14 How MySQL Transforms Subqueries
14.1 Item_in_subselect::select_transformer »
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Chapter 14. How MySQL Transforms Subqueries

Table of Contents     [+/-]

14.1.1. Scalar IN Subquery
14.1.2. Row IN Subquery
14.2. Item_allany_subselect
14.3. Item_singlerow_subselect

The Item_subselect virtual method select_transformer is used to rewrite subqueries. It is called from Item_subselect::init (which is called just after the call to the fix_fields() method for all items in JOIN::prepare).

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