Some errors are related to just CORRESPONDING without any columns. So using
> expr doesn't help here. So parse node CORRESPONDING can solve both issues.
 In current implementation pointing to a node means pointing to a node’s
first element so I don’t think we can be able to point to CORRESPONDING
without any columns

I find out that there is already a node prepare for the case called A_Const.
The attached patch use that node


Attachment: corresponding_clause_v5.patch
Description: Binary data

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