matrixone
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support some feature
What type of PR is this?
- [ ] API-change
- [ ] BUG
- [ ] Improvement
- [ ] Documentation
- [ ] Feature
- [ ] Test and CI
- [ ] Code Refactoring
Which issue(s) this PR fixes:
issue #57 #70 #4491
What this PR does / why we need it:
- support set variable = expr
- implement row count in show table status
- fix bug which update column that is on update