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Revert "nbtree: Remove useless row compare arg."

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This reverts commit 54c6ea8c81db718508eeea50991d3c1c5dff54a5.

Further analysis has shown that the forcenonrequired row compare
behavior is in fact necessary, despite the new restrictions on
RowCompares imposed by _bt_set_startikey following commit 5f4d98d4.

Discussion: https://postgr.es/m/CAH2-Wzm3bKcz3TbHGem3_+SinEyG=VZVPbApQghp7YiZj+MM3g@mail.gmail.com
This commit is contained in:
Peter Geoghegan 2025-06-11 18:16:15 -04:00
parent e1458f2f1b
commit dd2ce37927
1 changed files with 16 additions and 9 deletions
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25
src/backend/access/nbtree/nbtutils.c
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@ -63,7 +63,7 @@ static bool _bt_check_compare(IndexScanDesc scan, ScanDirection dir,
bool *continuescan, int *ikey);
static bool _bt_check_rowcompare(ScanKey skey,
IndexTuple tuple, int tupnatts, TupleDesc tupdesc,
ScanDirection dir, bool *continuescan);
ScanDirection dir, bool forcenonrequired, bool *continuescan);
static void _bt_checkkeys_look_ahead(IndexScanDesc scan, BTReadPageState *pstate,
int tupnatts, TupleDesc tupdesc);
static int _bt_keep_natts(Relation rel, IndexTuple lastleft,
@ -2902,10 +2902,8 @@ _bt_check_compare(IndexScanDesc scan, ScanDirection dir,
/* row-comparison keys need special processing */
if (key->sk_flags & SK_ROW_HEADER)
{
Assert(!forcenonrequired); /* forbidden by _bt_set_startikey */
if (_bt_check_rowcompare(key, tuple, tupnatts, tupdesc, dir,
continuescan))
forcenonrequired, continuescan))
continue;
return false;
}
@ -3062,7 +3060,8 @@ _bt_check_compare(IndexScanDesc scan, ScanDirection dir,
*/
static bool
_bt_check_rowcompare(ScanKey skey, IndexTuple tuple, int tupnatts,
TupleDesc tupdesc, ScanDirection dir, bool *continuescan)
TupleDesc tupdesc, ScanDirection dir,
bool forcenonrequired, bool *continuescan)
{
ScanKey subkey = (ScanKey) DatumGetPointer(skey->sk_argument);
int32 cmpresult = 0;
@ -3102,7 +3101,11 @@ _bt_check_rowcompare(ScanKey skey, IndexTuple tuple, int tupnatts,
if (isNull)
{
if (subkey->sk_flags & SK_BT_NULLS_FIRST)
if (forcenonrequired)
{
/* treating scan's keys as non-required */
}
else if (subkey->sk_flags & SK_BT_NULLS_FIRST)
{
/*
* Since NULLs are sorted before non-NULLs, we know we have
@ -3156,8 +3159,12 @@ _bt_check_rowcompare(ScanKey skey, IndexTuple tuple, int tupnatts,
*/
Assert(subkey != (ScanKey) DatumGetPointer(skey->sk_argument));
subkey--;
if ((subkey->sk_flags & SK_BT_REQFWD) &&
ScanDirectionIsForward(dir))
if (forcenonrequired)
{
/* treating scan's keys as non-required */
}
else if ((subkey->sk_flags & SK_BT_REQFWD) &&
ScanDirectionIsForward(dir))
*continuescan = false;
else if ((subkey->sk_flags & SK_BT_REQBKWD) &&
ScanDirectionIsBackward(dir))
@ -3209,7 +3216,7 @@ _bt_check_rowcompare(ScanKey skey, IndexTuple tuple, int tupnatts,
break;
}
if (!result)
if (!result && !forcenonrequired)
{
/*
* Tuple fails this qual. If it's a required qual for the current