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f36ca142f7
Prototype change: - virtual ha_rows records_in_range(uint inx, key_range *min_key, - key_range *max_key) + virtual ha_rows records_in_range(uint inx, const key_range *min_key, + const key_range *max_key, + page_range *res) The handler can ignore the page_range parameter. In the case the handler updates the parameter, the optimizer can deduce the following: - If previous range's last key is on the same block as next range's first key - If the current key range is in one block - We can also assume that the first and last block read are cached! This can be used for a better calculation of IO seeks when we estimate the cost of a range index scan. The parameter is fully implemented for MyISAM, Aria and InnoDB. A separate patch will update handler::multi_range_read_info_const() to take the benefits of this change and also remove the double records_in_range() calls that are not anymore needed. |
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| .. | ||
| mysql-test/storage_engine | ||
| CMakeLists.txt | ||
| ha_myisammrg.cc | ||
| ha_myisammrg.h | ||
| myrg_close.c | ||
| myrg_create.c | ||
| myrg_def.h | ||
| myrg_delete.c | ||
| myrg_extra.c | ||
| myrg_info.c | ||
| myrg_locking.c | ||
| myrg_open.c | ||
| myrg_panic.c | ||
| myrg_queue.c | ||
| myrg_range.c | ||
| myrg_records.c | ||
| myrg_rfirst.c | ||
| myrg_rkey.c | ||
| myrg_rlast.c | ||
| myrg_rnext.c | ||
| myrg_rnext_same.c | ||
| myrg_rprev.c | ||
| myrg_rrnd.c | ||
| myrg_rsame.c | ||
| myrg_static.c | ||
| myrg_update.c | ||
| myrg_write.c | ||