Enhance parallel foreign scan support #1571
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add a new mock foreign data wrapper (FDW) for testing parallel foreign scans. Key changes include: - Implementation of `parallel_foreign_scan_test_fdw` to generate synthetic rows and support parallel scanning. - Modifications to the optimizer to generate gather paths for foreign tables with parallel capabilities. - Updates to `execMain.c` to enable parallel mode for gather nodes based on the execution context. - Addition of test cases to validate the functionality of the new FDW in both coordinator and all-segments modes.
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support parallel foreign scan support and add a new mock fdw for testing parallel foreign scans.
Key changes include:
parallel_foreign_scan_test_fdwto generate synthetic rows and support parallel scanning.execMain.cto enable parallel mode for gather nodes based on the execution context.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:
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