liutang123 opened a new pull request, #68452:
URL: https://github.com/apache/doris/pull/68452
### What problem does this PR solve?
Problem Summary:
`SELECT max(dt) FROM hive_tbl` (and the `dt = (SELECT max(dt) FROM ...)`
latest-partition pattern) currently scans the whole table although the answer
is already in the partition metadata. Add PARTITION_VALUE pushdown: the scan
emits one row of partition column values per data file without opening any file.
Changes, in order:
1. gensrc: add `TPushAggOp.PARTITION_VALUE`.
2. BE: add `PartitionColumnReader` and install it in `FileScanner` when
every requested column is a partition column.
3. FE: add session variable
`enable_partition_column_value_only_optimization` (default true).
4. FE: add the two `AggregateStrategies` rules plus the PARTITION_VALUE
helpers, including the two rules that cross a `LogicalFilter`.
5. FE: treat a CTE producer/consumer, `PartitionTopN` and a no-group-by
aggregate as effective runtime-filter sources, so the runtime filter is not
pruned away.
6. FE: add `ConnectorCapability.SUPPORTS_PARTITION_VALUE_ONLY` (HIVE/HUDI
only) and plumb `ConnectorScanRequest.partitionValuePushdown`, so Hive stops
splitting files for this scan.
### Release note
New session variable `enable_partition_column_value_only_optimization`
(default true): a min/max aggregation over only Hive/Hudi partition columns is
answered from partition metadata without reading data files.
### Check List (For Author)
- Test: No need to test (with reason) — not run yet: the local FE build
fails on a pre-existing thrift version mismatch (thrift 0.16.0 vs libthrift
0.24.0) and BE was not compiled. Regression tests still to be added.
- Behavior changed: Yes — see the release note; gated by the new session
variable.
- Does this need documentation: No
### 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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