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Commite6b9254

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committed
Marginal speedup in RelationIsVisible and TypeIsVisible: avoid a redundant
cache lookup in the success case. This won't help much for cases wherethe given relation is far down the search path, but it does not hurt inany cases either; and it requires only a little new code. Per gripe fromJim Nasby about slowness of \d with many tables.
1 parentf59175d commite6b9254

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1 file changed

+42
-7
lines changed

1 file changed

+42
-7
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‎src/backend/catalog/namespace.c

Lines changed: 42 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -13,7 +13,7 @@
1313
* Portions Copyright (c) 1994, Regents of the University of California
1414
*
1515
* IDENTIFICATION
16-
* $PostgreSQL: pgsql/src/backend/catalog/namespace.c,v 1.77 2005/08/01 04:03:54 tgl Exp $
16+
* $PostgreSQL: pgsql/src/backend/catalog/namespace.c,v 1.78 2005/10/06 22:43:16 tgl Exp $
1717
*
1818
*-------------------------------------------------------------------------
1919
*/
@@ -335,12 +335,28 @@ RelationIsVisible(Oid relid)
335335
/*
336336
* If it is in the path, it might still not be visible; it could
337337
* be hidden by another relation of the same name earlier in the
338-
* path. So we must do a slow check to see if this rel would be
339-
* found by RelnameGetRelid.
338+
* path. So we must do a slow check for conflicting relations.
340339
*/
341340
char*relname=NameStr(relform->relname);
341+
ListCell*l;
342342

343-
visible= (RelnameGetRelid(relname)==relid);
343+
visible= false;
344+
foreach(l,namespaceSearchPath)
345+
{
346+
OidnamespaceId=lfirst_oid(l);
347+
348+
if (namespaceId==relnamespace)
349+
{
350+
/* Found it first in path */
351+
visible= true;
352+
break;
353+
}
354+
if (OidIsValid(get_relname_relid(relname,namespaceId)))
355+
{
356+
/* Found something else first in path */
357+
break;
358+
}
359+
}
344360
}
345361

346362
ReleaseSysCache(reltup);
@@ -417,12 +433,31 @@ TypeIsVisible(Oid typid)
417433
/*
418434
* If it is in the path, it might still not be visible; it could
419435
* be hidden by another type of the same name earlier in the path.
420-
* So we must do a slow check to see if this type would be found
421-
* by TypenameGetTypid.
436+
* So we must do a slow check for conflicting types.
422437
*/
423438
char*typname=NameStr(typform->typname);
439+
ListCell*l;
424440

425-
visible= (TypenameGetTypid(typname)==typid);
441+
visible= false;
442+
foreach(l,namespaceSearchPath)
443+
{
444+
OidnamespaceId=lfirst_oid(l);
445+
446+
if (namespaceId==typnamespace)
447+
{
448+
/* Found it first in path */
449+
visible= true;
450+
break;
451+
}
452+
if (SearchSysCacheExists(TYPENAMENSP,
453+
PointerGetDatum(typname),
454+
ObjectIdGetDatum(namespaceId),
455+
0,0))
456+
{
457+
/* Found something else first in path */
458+
break;
459+
}
460+
}
426461
}
427462

428463
ReleaseSysCache(typtup);

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