mrhhsg opened a new pull request, #61535:
URL: https://github.com/apache/doris/pull/61535
Introduce an EWMA-based AdaptiveBlockSizePredictor that dynamically adjusts
SegmentIterator chunk row counts so each output Block stays near the
session-variable-configured preferred_block_size_bytes target. A complementary
byte-budget stop condition is added to all BlockReader and VCollectIterator
accumulation loops so the final Block returned to the upper layer is also
bounded.
Key changes:
- New BE config: enable_adaptive_batch_size (default: true)
- New session variables: preferred_block_size_bytes (8 MB),
preferred_max_column_in_block_size_bytes (1 MB)
- New Thrift fields 204/205 for FE→BE propagation
- AdaptiveBlockSizePredictor: EWMA per-row and per-column byte estimator
with conservative segment-metadata bootstrap
- SegmentIterator: predicts rows before each next_batch call; updates EWMA
on success path
- BlockReader: byte-stop in _replace_key_next_block, _unique_key_next_block,
_agg_key_next_block
- VCollectIterator: byte-stop in Level1Iterator::_merge_next
- Unit tests and regression tests included
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
### Release note
None
### 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 -->
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