Modify the orca optimizer's processing of unionall distribution strat… #399
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Change logs
When there are many nodes, the first plan will cause performance bottlenecks and need to be modified. Fortunately, the gpdb community has also modified th is. Commit is 0cd056a0a3d3c30a1d6d4479e67802b6673118c7.
Why are the changes needed?
1.Affect performance
2.Plan is unreasonable
Does this PR introduce any user-facing change?
yes, tpcds 167 query.
How was this patch tested?
yes.
Contributor's Checklist
Here are some reminders and checklists before/when submitting your pull request, please check them:
make installcheck
make -C src/test installcheck-cbdb-parallel