Change a couple of "can't happen" error messages to be a shade more

verbose when they do happen.  The "left link changed unexpectedly"
one in particular has been seen more than once in the field.

diff --git a/src/backend/access/nbtree/nbtpage.c b/src/backend/access/nbtree/nbtpage.c
index f3ce5bd64a9c59373b6a01cb0ac740c8f1ae8245..52d60abaec0beff79b2ada53961d1578e9f927fd 100644 (file)
--- a/src/backend/access/nbtree/nbtpage.c
+++ b/src/backend/access/nbtree/nbtpage.c
@@ -9,7 +9,7 @@
  *
  *
  * IDENTIFICATION
- *   $PostgreSQL: pgsql/src/backend/access/nbtree/nbtpage.c,v 1.86 2005/06/06 20:22:57 tgl Exp $
+ *   $PostgreSQL: pgsql/src/backend/access/nbtree/nbtpage.c,v 1.87 2005/08/12 14:34:14 tgl Exp $
  *
  * NOTES
  *    Postgres btree pages look like ordinary relation pages.  The opaque
@@ -826,7 +826,8 @@ _bt_pagedel(Relation rel, Buffer buf, bool vacuum_full)
            _bt_relbuf(rel, lbuf);
            if (leftsib == P_NONE)
            {
-               elog(LOG, "no left sibling (concurrent deletion?)");
+               elog(LOG, "no left sibling (concurrent deletion?) in \"%s\"",
+                    RelationGetRelationName(rel));
                return 0;
            }
            lbuf = _bt_getbuf(rel, leftsib, BT_WRITE);
@@ -861,7 +862,8 @@ _bt_pagedel(Relation rel, Buffer buf, bool vacuum_full)
        return 0;
    }
    if (opaque->btpo_prev != leftsib)
-       elog(ERROR, "left link changed unexpectedly");
+       elog(ERROR, "left link changed unexpectedly in block %u of \"%s\"",
+            target, RelationGetRelationName(rel));
 
    /*
     * And next write-lock the (current) right sibling.
@@ -984,8 +986,8 @@ _bt_pagedel(Relation rel, Buffer buf, bool vacuum_full)
        itemid = PageGetItemId(page, nextoffset);
        btitem = (BTItem) PageGetItem(page, itemid);
        if (ItemPointerGetBlockNumber(&(btitem->bti_itup.t_tid)) != rightsib)
-           elog(PANIC, "right sibling is not next child");
-
+           elog(PANIC, "right sibling is not next child in \"%s\"",
+                RelationGetRelationName(rel));
        PageIndexTupleDelete(page, nextoffset);
    }