ORCA: Support create plan in singlenode mode#1273
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In single node mode, ORCA may produce incorrect results for some insert/update/delete operations, or sublink/subselect operations. I don't have plan to spend a lot of time to support all operators. The current commit supports singlenode-mode in ORCA and disables unsupported operators.
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Fixes #ISSUE_Number
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make installcheckmake -C src/test installcheck-cbdb-parallelImpact
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