Hi: patch v4 fixed the 2 bugs Zhihong reported.
Any feedback is welcome.
v4-0005-Support-UniqueKey-on-JoinRel.patch
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v4-0002-Just-some-utils-functions.patch
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v4-0004-Support-UniqueKey-on-BaseRel.patch
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v4-0001-Just-refactor-pathkeys_useful_for_merging-split-a.patch
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v4-0003-add-the-not-null-attrs-for-RelOptInfo.-Here-is-ho.patch
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v4-0006-Maintain-the-UniqueKey-on-Subquery-and-UpperRel-l.patch
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