sri harsha <[email protected]> writes:
> Its not an OpExpr . It is a VAR , got it from "reltargetlist" in base
> relation ( RelOptInfo) .
Read the comment:
* reltargetlist - List of Var and PlaceHolderVar nodes for the values
* we need to output from this relation.
* List is in no particular order, but all rels of an
* appendrel set must use corresponding orders.
* NOTE: in an appendrel child relation, may contain
* arbitrary expressions pulled up from a subquery!
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
In general, it's seldom a good idea to assume that a Node is of a specific
type without having confirmed that with an IsA() check.
regards, tom lane
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