On Sat, Sep 23, 2017 at 6:29 AM, Julien Rouhaud <rjuju...@gmail.com> wrote:
> That's true, but numCols, sortColdIdx etc are also used to display the
> sort key in an explain.  If an append can return sorted data, it
> should also display the sort information, so I think these fields are
> still required in an Append node.

I don't think so.  An index scan doesn't output that information, nor
does a nested loop which inherits a sort order from its outer path.  I
think the rule is that a plan node which takes steps to get the data
into a certain order might want to output something about that, but a
plan node which somehow gets that ordering without taking any explicit
action doesn't print anything.

Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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