On Thu, Jul 26, 2012 at 11:39 PM, <Chaoyong.Wang@emc.com> wrote:
> Here is my task situation:
>
> I have a TupleTableSlot, with its own TupleDesc. Now I want to extract
> several attributes to form a new TupleTableSlot, how can I define my own
> TupleDesc and the ProjectionInfo?
You might get more helpful advice if you describe more specifically
what you're trying to do. I mean, here's one way to create a
TupleDesc (from contrib/adminpack) but it may or may not be suitable
for your purposes:
tupdesc = CreateTemplateTupleDesc(2, false); TupleDescInitEntry(tupdesc, (AttrNumber) 1,
"starttime", TIMESTAMPOID, -1, 0);
TupleDescInitEntry(tupdesc,(AttrNumber) 2, "filename", TEXTOID, -1,
0);
As ProjectInfo, maybe ExecBuildProjectionInfo?
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
