matrixone
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optimize the memory reuse of pipeline spool.
What type of PR is this?
- [ ] API-change
- [ ] BUG
- [x] Improvement
- [ ] Documentation
- [ ] Feature
- [ ] Test and CI
- [ ] Code Refactoring
Which issue(s) this PR fixes:
https://github.com/matrixorigin/MO-Cloud/issues/4212
What this PR does / why we need it:
提高spool的内存复用效率,从第2个batch开始复用内存,可以降低部分查询的内存峰值。