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Support window functions a la SQL:2008.

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Hitoshi Harada, with some kibitzing from Heikki and Tom.
This commit is contained in:
Tom Lane
2008-12-28 18:54:01 +00:00
parent 38e9348282
commit 95b07bc7f5
92 changed files with 6720 additions and 321 deletions
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18
src/backend/optimizer/util/tlist.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/util/tlist.c,v 1.83 2008/10/21 20:42:53 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/util/tlist.c,v 1.84 2008/12/28 18:53:57 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -101,28 +101,28 @@ flatten_tlist(List *tlist)
/*
* add_to_flat_tlist
* Add more vars to a flattened tlist (if they're not already in it)
* Add more items to a flattened tlist (if they're not already in it)
*
* 'tlist' is the flattened tlist
* 'vars' is a list of Var and/or PlaceHolderVar nodes
* 'exprs' is a list of expressions (usually, but not necessarily, Vars)
*
* Returns the extended tlist.
*/
List *
add_to_flat_tlist(List *tlist, List *vars)
add_to_flat_tlist(List *tlist, List *exprs)
{
int next_resno = list_length(tlist) + 1;
ListCell *v;
ListCell *lc;
foreach(v, vars)
foreach(lc, exprs)
{
Node *var = (Node *) lfirst(v);
Node *expr = (Node *) lfirst(lc);
if (!tlist_member(var, tlist))
if (!tlist_member(expr, tlist))
{
TargetEntry *tle;
tle = makeTargetEntry(copyObject(var), /* copy needed?? */
tle = makeTargetEntry(copyObject(expr), /* copy needed?? */
next_resno++,
NULL,
false);