KiteSQL
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feat: support for related subquery
What problem does this PR solve?
Using the RBO method, the related subquery is implemented.
What is changed and how it works?
Code changes
- [x] Has Rust code change
- [ ] Has CI related scripts change
Check List
Tests
- [x] Unit test
- [ ] Integration test
- [ ] Manual test (add detailed scripts or steps below)
- [ ] No code
Side effects
- [ ] Performance regression: Consumes more CPU
- [ ] Performance regression: Consumes more Memory
- [ ] Breaking backward compatibility