MySQL Internals Manual  /  ...  /  NULLs Filtering for ref and eq_ref Access

7.3.1 NULLs Filtering for ref and eq_ref Access

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7.3.1.1 Early NULLs Filtering
7.3.1.2 Late NULLs Filtering

This section discusses the NULLs filtering optimization used for ref and eq_ref joins.


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