HappenLee opened a new pull request #4138:
URL: https://github.com/apache/incubator-doris/pull/4138


       1.Release the rowbatch mem, before sort node check memtracker
       2.Change BufferedBlockMgr buffer check in spill sort to fix 
muli-operator try to use Block Buffer。use``available_buffers``` Method replace 
of ```available_allocated_buffers()``` and ```num_free_buffers()```. This two 
method is not clear what sorter relly need.
   
   
   Fix:issue #4137
   
   ## Proposed changes
   
   Fix:issue #4137
   
   ## Types of changes
   
   What types of changes does your code introduce to Doris?
   _Put an `x` in the boxes that apply_
   
   - [ ] Bugfix (non-breaking change which fixes an issue)
   - [ ] New feature (non-breaking change which adds functionality)
   - [x] Breaking change (fix or feature that would cause existing 
functionality to not work as expected)
   - [ ] Documentation Update (if none of the other choices apply)
   
   ## Checklist
   
   _Put an `x` in the boxes that apply. You can also fill these out after 
creating the PR. If you're unsure about any of them, don't hesitate to ask. 
We're here to help! This is simply a reminder of what we are going to look for 
before merging your code._
   
   - [x] I have create an issue on [Doris's 
issues](https://github.com/apache/incubator-doris/issues), and have described 
the bug/feature there in detail
   - [x] Commit messages in my PR start with the related issues ID, like "#4071 
Add pull request template to doris project"
   - [x] Compiling and unit tests pass locally with my changes
   - [x] I have added tests that prove my fix is effective or that my feature 
works
   - [x] If this change need a document change, I have updated the document
   - [x] Any dependent changes have been merged
   


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