orca: implement intra-segment parallel table scan support #1398
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Please add more test cases |
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src/backend/gporca/libgpopt/include/gpopt/base/CRewindabilitySpec.h
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src/backend/gporca/libgpopt/src/operators/CPhysicalParallelTableScan.cpp
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see src/test/regress:installcheck-orca-parallel |
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
revert CDistributionSpecRandom.cpp
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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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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
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
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