| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | sri harsha <sriharsha9992(at)gmail(dot)com> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: UNION ALL - Var attno |
| Date: | 2016-04-29 13:35:23 |
| Message-ID: | 12413.1461936923@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
sri harsha <sriharsha9992(at)gmail(dot)com> 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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