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The logic in systable_beginscan to translate heap attribute numbers to

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index column numbers needs to handle the case where you have more than
one scankey on the same index column. toast_fetch_datum_slice() needs it.
This commit is contained in:
Heikki Linnakangas 2008-11-06 13:07:08 +00:00
parent 53b4e469ca
commit 5ae29525d1
1 changed files with 27 additions and 17 deletions
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44
src/backend/access/index/genam.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/index/genam.c,v 1.71 2008/06/19 00:46:03 alvherre Exp $
* $PostgreSQL: pgsql/src/backend/access/index/genam.c,v 1.72 2008/11/06 13:07:08 heikki Exp $
*
* NOTES
* many of the old access method routines have been turned into
@ -194,16 +194,21 @@ systable_beginscan(Relation heapRelation,
{
int i;
/*
* Change attribute numbers to be index column numbers.
*
* This code could be generalized to search for the index key numbers
* to substitute, but for now there's no need.
*/
/* Change attribute numbers to be index column numbers. */
for (i = 0; i < nkeys; i++)
{
Assert(key[i].sk_attno == irel->rd_index->indkey.values[i]);
key[i].sk_attno = i + 1;
int j;
for (j = 0; j < irel->rd_index->indnatts; j++)
{
if (key[i].sk_attno == irel->rd_index->indkey.values[j])
{
key[i].sk_attno = j + 1;
break;
}
}
if (j == irel->rd_index->indnatts)
elog(ERROR, "column is not in index");
}
sysscan->iscan = index_beginscan(heapRelation, irel,
@ -352,16 +357,21 @@ systable_beginscan_ordered(Relation heapRelation,
sysscan->heap_rel = heapRelation;
sysscan->irel = indexRelation;
/*
* Change attribute numbers to be index column numbers.
*
* This code could be generalized to search for the index key numbers
* to substitute, but for now there's no need.
*/
/* Change attribute numbers to be index column numbers. */
for (i = 0; i < nkeys; i++)
{
Assert(key[i].sk_attno == indexRelation->rd_index->indkey.values[i]);
key[i].sk_attno = i + 1;
int j;
for (j = 0; j < indexRelation->rd_index->indnatts; j++)
{
if (key[i].sk_attno == indexRelation->rd_index->indkey.values[j])
{
key[i].sk_attno = j + 1;
break;
}
}
if (j == indexRelation->rd_index->indnatts)
elog(ERROR, "column is not in index");
}
sysscan->iscan = index_beginscan(heapRelation, indexRelation,