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23.16.12 Implementing the index_prev() Method

The [custom-engine.html#custom-engine-api-reference-index_prev index_prev()] method is used for reverse index scanning:

 int ha_foo::index_prev(byte * buf)

The *buf parameter is populated with the row that corresponds to the previous matching key value according to the internal cursor set by the storage engine during operations such as index_read() and index_last().