Temporarily preventing index from being selected

[Olivier Chédru]

Hi!

I am developing a storage engine for MySQL 5.5. My storage engine is able to perform
online index alterations.

I would like to prevent MySQL from choosing an index currently being added by the storage
engine.

To do so, my handler::records_in_range() method returns HA_POS_ERROR.
However this does not work: the index is used by the query anyway.

Any idea about how to achieve that?

Thanks
Olivier