hubgeter opened a new pull request, #69060:
URL: https://github.com/apache/doris/pull/69060
### What problem does this PR solve?
Problem Summary:
MaxCompute dynamic-partition writes need each partition's rows to be
contiguous in one writer stream, so the connector sink requested a partition
shuffle plus a local sort. It used `MustLocalSortOrderSpec` for that, which the
enforcer reads as "sort locally BEFORE distributing" and therefore appends a
global sort: an extra merging exchange after the partition shuffle. Under
local-channel backpressure that merging receiver can wait forever on a sender
blocked by another full receiver queue, hanging `INSERT INTO <dynamic-partition
table>` until the client-side socket times out.
This PR requests a plain `OrderSpec` on top of the hash distribution
instead, so the plan becomes `distribution -> local sort` (no global sort, no
merging exchange) while keeping the same writer-local grouping contract. The
SPI javadoc, the unit tests, and the MaxCompute write cases (explain shape:
`VSORT` before `VEXCHANGE`, no `VMERGING-EXCHANGE`) are updated accordingly.
### Release note
Fix intermittent hangs when writing dynamic partitions to MaxCompute.
### Check List (For Author)
- Test
- [x] Regression test
- [x] 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
- Behavior changed:
- [ ] No.
- [x] Yes.
- Does this need documentation?
- [x] No.
- [ ] Yes.
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label
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