JingsongLi opened a new pull request, #262:
URL: https://github.com/apache/paimon-rust/pull/262
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### Purpose
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Add filter_exact tracking to PaimonTableScan so DataFusion's
aggregate_statistics optimizer can eliminate scans for COUNT(*) queries when
row counts are precisely known.
- Add filter_exact field to PaimonTableScan and PaimonScanBuilder
- Return Precision::Exact(num_rows) when merged_row_count is known for all
splits, no limit is applied, and filter is exact
- Fix filter_exact computation: no predicate should be considered exact
- Refactor build_paimon_scan into PaimonScanBuilder struct to satisfy
clippy::too_many_arguments
- Add count_pushdown.rs integration tests covering:
- COUNT(*) without filter (pushes down)
- COUNT(*) with data filter (does not push down)
- COUNT(*) with partition filter (pushes down)
- COUNT(*) with mixed partition+data filter (does not push down)
- COUNT(*) on empty/single-row tables (pushes down)
- Run all paimon-datafusion tests in CI instead of just read_tables
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### Brief change log
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they address the issue -->
### Tests
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### API and Format
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### Documentation
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