JingsongLi opened a new pull request, #205:
URL: https://github.com/apache/paimon-rust/pull/205
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### Purpose
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Subtask of #173
Major scan optimizations for TableScan:
- Push partition/data predicate filters into read_all_manifest_entries for
early concurrent pruning during manifest reading
- Add manifest-file-level partition stats pruning before reading manifest
files
- DV level-0 filtering now only applies to primary-key tables; non-PK tables
with DV keep level-0 files
- Filter out postpone bucket (bucket < 0) entries for PK tables
- Data evolution group-level predicate filtering: after
group_by_overlapping_row_id, merged stats across overlapping files allow
pruning entire groups
- Bucket predicate filtering: extract bucket key predicates (Eq/In), compute
target buckets via MurmurHash3 (seed=42, word-aligned), and skip manifest
entries whose bucket is not in the target set. Supports composite bucket keys
and defaults to primary keys for PK tables.
New files:
- murmur_hash.rs: Paimon-compatible MurmurHash3 32-bit implementation with
compute_bucket_from_datums for BinaryRow construction from typed Datum values
New CoreOptions: bucket_key(), bucket()
New utility: extract_predicate_for_keys() generic predicate projection
Tests: unit tests for bucket computation, predicate extraction, and target
bucket calculation; integration tests for PK-without-DV, non-PK-with-DV,
postpone bucket, data evolution filtering, and bucket predicate filtering.
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### Brief change log
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### Tests
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### API and Format
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### Documentation
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