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* lateral_vars - lateral cross-references of rel, if any (list of
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* Vars and PlaceHolderVars)
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* lateral_relids - required outer rels for LATERAL, as a Relids set
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* lateral_referencers - relids of rels that reference this one laterally
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* indexlist - list of IndexOptInfo nodes for relation's indexes
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* (always NIL if it's not a table)
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* pages - number of disk pages in relation (zero if not a table)