orca: implement intra-segment parallel table scan support#1398
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Please add more test cases |
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see src/test/regress:installcheck-orca-parallel |
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Add some cases to test the plan? |
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maybe after impl parallel hash join . |
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LGTM. |
zhangwenchao-123
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Add comprehensive parallel table scan capability to GPORCA optimizer, enabling worker-level parallelism within segments for improved query performance on large table scans. Key components: - New CPhysicalParallelTableScan operator and CDistributionSpecWorkerRandom distribution specification for worker-level data distribution - CXformGet2ParallelTableScan transformation with parallel safety checks (excludes CTEs, dynamic scans, foreign tables, replicated tables, etc.) - Cost model integration with parallel_setup_cost and efficiency degradation scaling (logarithmic based on worker count) - DXL serialization/deserialization for CDXLPhysicalParallelTableScan - Plan translation to PostgreSQL SeqScan nodes with parallel_aware=true - Rewindability constraints (parallel scans are non-rewindable) - GUC integration: max_parallel_workers_per_gather controls worker count
In Cloudberry's MPP architecture, segment stats are delivered asynchronously to the coordinator. The seq_scan counter can be registered before seq_tup_read arrives from segments, causing wait_for_stats() to exit prematurely and the subsequent assertion to fail intermittently in the pax-ic-good-opt-off CI job. Add an explicit wait condition (updated6) for seq_tup_read reaching the expected value, and update the comment to reflect Cloudberry's segment-level async stats delivery rather than parallel workers.
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Add comprehensive parallel table scan capability to GPORCA optimizer, enabling worker-level parallelism within segments for improved query performance on large table scans.
Key components:
Impl #1316
TPCH improved 15%.
What does this PR do?
Type of Change
Breaking Changes
Test Plan
make installcheckmake -C src/test installcheck-cbdb-parallelImpact
Performance:
User-facing changes:
Dependencies:
Checklist
Additional Context
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