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Commit9b69c4b

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committed
fix backward scanPage
1 parent096fa86 commit9b69c4b

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1 file changed

+45
-11
lines changed

1 file changed

+45
-11
lines changed

‎rumget.c

Lines changed: 45 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -1596,7 +1596,8 @@ scanPage(RumState * rumstate, RumScanEntry entry, RumKey *item, Page page,
15961596
OffsetNumberfirst=FirstOffsetNumber,
15971597
i,
15981598
maxoff;
1599-
boolfound;
1599+
int16bound=-1;
1600+
boolfound_eq= false;
16001601
intcmp;
16011602

16021603
ItemPointerSetMin(&iter_item.iptr);
@@ -1611,6 +1612,7 @@ scanPage(RumState * rumstate, RumScanEntry entry, RumKey *item, Page page,
16111612

16121613
ptr=RumDataPageGetData(page);
16131614
maxoff=RumPageGetOpaque(page)->maxoff;
1615+
16141616
for (j=0;j<RumDataLeafIndexCount;j++)
16151617
{
16161618
RumDataLeafItemIndex*index=&RumPageGetIndexes(page)[j];
@@ -1629,39 +1631,71 @@ scanPage(RumState * rumstate, RumScanEntry entry, RumKey *item, Page page,
16291631
else
16301632
cmp=rumCompareItemPointers(&index->iptr,&item->iptr);
16311633

1632-
if (cmp<0|| (cmp <=0&&!equalOk))
1634+
if (cmp<0|| (cmp <=0&&equalOk))
16331635
{
16341636
ptr=RumDataPageGetData(page)+index->pageOffset;
16351637
first=index->offsetNumer;
16361638
iter_item.iptr=index->iptr;
16371639
}
16381640
else
16391641
{
1640-
maxoff=index->offsetNumer-1;
1642+
if (ScanDirectionIsBackward(entry->scanDirection))
1643+
{
1644+
if (j+1<RumDataLeafIndexCount)
1645+
maxoff=RumPageGetIndexes(page)[j+1].offsetNumer;
1646+
}
1647+
else
1648+
maxoff=index->offsetNumer-1;
16411649
break;
16421650
}
16431651
}
16441652

1653+
if (ScanDirectionIsBackward(entry->scanDirection))
1654+
{
1655+
first=FirstOffsetNumber;
1656+
ItemPointerSetMin(&iter_item.iptr);
1657+
ptr=RumDataPageGetData(page);
1658+
}
1659+
16451660
entry->nlist=maxoff-first+1;
1646-
entry->offset=InvalidOffsetNumber;
1647-
found= false;
1661+
bound=-1;
16481662
for (i=first;i <=maxoff;i++)
16491663
{
16501664
ptr=rumDataPageLeafRead(ptr,entry->attnum,&iter_item,rumstate);
16511665
entry->list[i-first]=iter_item;
16521666

1667+
if (bound!=-1)
1668+
continue;
1669+
16531670
cmp=compareRumKey(rumstate,entry->attnumOrig,
16541671
item,&iter_item);
1655-
if ((cmp<0|| (cmp <=0&&equalOk))&&entry->offset==InvalidOffsetNumber)
1672+
1673+
if (cmp <=0)
16561674
{
1657-
found= true;
1658-
entry->offset=i-first+1;
1675+
bound=i-first;
1676+
if (cmp==0)
1677+
found_eq= true;
16591678
}
16601679
}
1661-
if (!found)
1680+
1681+
if (bound==-1)
16621682
return false;
16631683

1664-
entry->curRumKey=entry->list[entry->offset-1];
1684+
if (found_eq)
1685+
{
1686+
entry->offset=bound;
1687+
if (!equalOk)
1688+
entry->offset+=entry->scanDirection;
1689+
}
1690+
elseif (ScanDirectionIsBackward(entry->scanDirection))
1691+
entry->offset=bound-1;
1692+
else
1693+
entry->offset=bound;
1694+
1695+
if (entry->offset<0||entry->offset >=entry->nlist)
1696+
return false;
1697+
1698+
entry->curRumKey=entry->list[entry->offset];
16651699
return true;
16661700
}
16671701

@@ -1692,7 +1726,7 @@ entryFindItem(RumState * rumstate, RumScanEntry entry, RumKey * item)
16921726
entry->scanDirection,
16931727
&entry->curRumKey,item) >=0)
16941728
return;
1695-
while (entry->offset<entry->nlist)
1729+
while (entry->offset>=0&&entry->offset<entry->nlist)
16961730
{
16971731
if (compareRumKeyScanDirection(rumstate,entry->attnumOrig,
16981732
entry->scanDirection,

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