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Major planner/optimizer revision: get rid of PathOrder node type,

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store all ordering information in pathkeys lists (which are now lists of
lists of PathKeyItem nodes, not just lists of lists of vars).  This was
a big win --- the code is smaller and IMHO more understandable than it
was, even though it handles more cases.  I believe the node changes will
not force an initdb for anyone; planner nodes don't show up in stored
rules.
This commit is contained in:
Tom Lane
1999-08-16 02:17:58 +00:00
parent 08320bfb22
commit e6381966c1
43 changed files with 1937 additions and 3270 deletions
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28
src/backend/optimizer/path/allpaths.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/allpaths.c,v 1.52 1999/07/30 22:34:17 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/allpaths.c,v 1.53 1999/08/16 02:17:50 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -331,32 +331,14 @@ print_path(Query *root, Path *path, int indent)
int size = path->parent->size;
int relid = lfirsti(path->parent->relids);
printf("%s(%d) size=%d cost=%f",
printf("%s(%d) size=%d cost=%f\n",
ptype, relid, size, path->path_cost);
if (nodeTag(path) == T_IndexPath)
if (IsA(path, IndexPath))
{
List *k,
*l;
printf(" pathkeys=");
foreach(k, path->pathkeys)
{
printf("(");
foreach(l, lfirst(k))
{
Var *var = lfirst(l);
printf("%d.%d", var->varnoold, var->varoattno);
if (lnext(l))
printf(", ");
}
printf(")");
if (lnext(k))
printf(", ");
}
printf(" pathkeys=");
print_pathkeys(path->pathkeys, root->rtable);
}
printf("\n");
}
}