support full join for nested loop join

[crwen]

What problem does this PR solve?

Issue link: #206

Add support for nested loop join

Some results does not mathe sql statements(e.g. column numbers, results order) in join.slt, so I changed some results or sql. And some sql may have wrong syntax, so I remain them commented.

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

Note for reviewer