Gabriel39 opened a new pull request, #45365:
URL: https://github.com/apache/doris/pull/45365
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
Split scan ranges evenly into `parallelExecInstanceNum` instances.
For a fragment contains co-located join,
scan (id = 0) -> join build (id = 2)
|
scan (id = 1) -> join probe (id = 2)
If both of `scan (id = 0)` and `scan (id = 1)` are serial operators, we
will plan local exchanger
after them:
scan (id = 0) -> local exchange -> join build (id = 2)
|
scan (id = 1) -> local exchange -> join probe (id = 2)
And there is another more complicated scenario, for example, `scan (id =
0)` has 10 partitions and
3 buckets which means 3 * 10 tablets and `scan (id = 1)` has 3 buckets and
no partition which means
3 tablets totally. If expected parallelism is 8, we will get a serial scan
(id = 0) and a
non-serial scan (id = 1). For this case, we will plan another plan with
local exchange:
scan (id = 0) -> local exchange -> join build (id = 2)
|
scan (id = 1) -> join probe (id = 2)
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [ ] Unit Test
- [ ] Manual test (add detailed scripts or steps below)
- [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
- [ ] Previous test can cover this change.
- [ ] No code files have been changed.
- [ ] Other reason <!-- Add your reason? -->
- Behavior changed:
- [ ] No.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [ ] No.
- [ ] Yes. <!-- Add document PR link here. eg:
https://github.com/apache/doris-website/pull/1214 -->
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label <!-- Add branch pick label that this PR should
merge into -->
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org
For additional commands, e-mail: commits-h...@doris.apache.org
