yiguolei opened a new pull request, #12936:
URL: https://github.com/apache/doris/pull/12936
# Proposed changes
Issue Number: close #xxx
## Problem summary
Some query read string columns continuously, but the string will be copied
to ColumnString one by one from page. There are two improvement in this PR:
1. Resize the chars using the avg size of 100 string rows.
2. Calculate the max continuous rows and copy using a single memcpy command.
I also add a padding size in page, so that we could using overflow memcpy in
the future.
## Checklist(Required)
1. Does it affect the original behavior:
- [ ] Yes
- [ ] No
- [ ] I don't know
4. Has unit tests been added:
- [ ] Yes
- [ ] No
- [ ] No Need
5. Has document been added or modified:
- [ ] Yes
- [ ] No
- [ ] No Need
6. Does it need to update dependencies:
- [ ] Yes
- [ ] No
7. Are there any changes that cannot be rolled back:
- [ ] Yes (If Yes, please explain WHY)
- [ ] No
## Further comments
If this is a relatively large or complex change, kick off the discussion at
[d...@doris.apache.org](mailto:d...@doris.apache.org) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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