[fix](regression): stabilize push_down_filter_through_set_operation_with_unique_function plan shape#64516
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…h_unique_function shape Set parallel_pipeline_task_num=2 to avoid single-instance optimization (b1112e5) that skips two-phase aggregation on low-core BE clusters. When parallel=1 on a single-BE cluster, isSingleExecutionInstance returns true and hashAgg[LOCAL] is not generated, causing the plan shape to diverge from the expected output. Related PR: apache#62742 Co-Authored-By: Claude <noreply@anthropic.com>
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Problem
The regression test
push_down_filter_through_set_operation_with_unique_functioninnereids_rules_p0/unique_function/is unstable across different pipeline environments.When the cluster has only one pipeline executor (
parallel=1),SplitAggWithoutDistinctskips two-phase aggregation (introduced in #63732), andhashAgg[LOCAL]is not generated. This causes the plan shape to diverge from the expected output:Fix
Add
SET parallel_pipeline_task_num=2to the test suite to lock non-single-instance mode, ensuringhashAgg[LOCAL]is always generated regardless of BE hardware.Related PR
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