yixiutt opened a new pull request, #14900:
URL: https://github.com/apache/doris/pull/14900
# Proposed changes
In vertical compaction, every segment iterator will be loaded into Heap and
then traverse all data, this will cost a lot
of memory as every segment need to load a block. Actually, segments can be
loaded on demand.If a rowset is none overlapping, then it's segment can be
traversed one by one.
In this pr, I use a iterator_init_flags to indicate whether a segment should
be loaded when build vertical merger.
For example, if i have 3 rowsets and each one have 3 segments, and rowset 2
is none overlapping, then 9 segments
use a vector [1,1,1,1,0,0,1,1,1] to show that segments 0,1,2,3,6,7,8 should
be loaded once build vertical merged
and segments 4,5 can be loaded one by one when segment 3 reached it's end
## Problem summary
Describe your changes.
## Checklist(Required)
1. Does it affect the original behavior:
- [ ] Yes
- [ ] No
- [ ] I don't know
2. Has unit tests been added:
- [ ] Yes
- [ ] No
- [ ] No Need
3. Has document been added or modified:
- [ ] Yes
- [ ] No
- [ ] No Need
4. Does it need to update dependencies:
- [ ] Yes
- [ ] No
5. 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
[[email protected]](mailto:[email protected]) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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