- Set the default - Adjust the testcases so that 'new' tests are run with optimizations turned on. - Pull out relevant tests from "irrelevant" tests and run them with optimizations on. - Run range.test and innodb.test with both mrr=on and mrr=off
- Fix the code to work with IndexConditionPushdown+BKA (EXPLAIN is still incorrect, see comments in the patch) - Test coverage for ICP+BKA
- Add testcases - Code cleanup: garbage removal, better comments, make members private where possible