wgy8283335 opened a new issue #12709:
URL: https://github.com/apache/shardingsphere/issues/12709
## Tasks in the federate optimizer
- [x] Add the filter push-down rule in the hep planner and related unit test.
- [x] Add sub-query in sqlNodeConvertEngine and unit tests for sub-query
rules.
- [ ] Add metadata query for volcano planner and related unit test.
- [ ] Recheck the rule and test, make sure that the rule list and test
result are reasonable.
- [ ] Add unit tests for other rules.
- [ ] Resolve some hard cases:
- [ ] ISSUE 12894
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