/*
* Compare two keys of possibly different index columns
*/
int
ginCompareAttEntries(GinState *ginstate,
OffsetNumber attnuma, Datum a, GinNullCategory categorya,
OffsetNumber attnumb, Datum b, GinNullCategory categoryb)
{
/* attribute number is the first sort key */
if (attnuma != attnumb)
return (attnuma < attnumb) ? -1 : 1;
return ginCompareEntries(ginstate, attnuma, a, categorya, b, categoryb);
}
/*
* Create a new GinScanEntry, unless an equivalent one already exists,
* in which case just return it
*/
static GinScanEntry
ginFillScanEntry(GinScanOpaque so, OffsetNumber attnum,
StrategyNumber strategy, int32 searchMode,
Datum queryKey, GinNullCategory queryCategory,
bool isPartialMatch, Pointer extra_data)
{
GinState *ginstate = &so->ginstate;
GinScanEntry scanEntry;
uint32 i;
/*
* Look for an existing equivalent entry.
*
* Entries with non-null extra_data are never considered identical, since
* we can't know exactly what the opclass might be doing with that.
*/
if (extra_data == NULL)
{
for (i = 0; i < so->totalentries; i++)
{
GinScanEntry prevEntry = so->entries[i];
if (prevEntry->extra_data == NULL &&
prevEntry->isPartialMatch == isPartialMatch &&
prevEntry->strategy == strategy &&
prevEntry->searchMode == searchMode &&
prevEntry->attnum == attnum &&
ginCompareEntries(ginstate, attnum,
prevEntry->queryKey,
prevEntry->queryCategory,
queryKey,
queryCategory) == 0)
{
/* Successful match */
return prevEntry;
}
}
}
/* Nope, create a new entry */
scanEntry = (GinScanEntry) palloc(sizeof(GinScanEntryData));
scanEntry->queryKey = queryKey;
scanEntry->queryCategory = queryCategory;
scanEntry->isPartialMatch = isPartialMatch;
scanEntry->extra_data = extra_data;
scanEntry->strategy = strategy;
scanEntry->searchMode = searchMode;
scanEntry->attnum = attnum;
scanEntry->buffer = InvalidBuffer;
ItemPointerSetMin(&scanEntry->curItem);
scanEntry->matchBitmap = NULL;
scanEntry->matchIterator = NULL;
scanEntry->matchResult = NULL;
scanEntry->list = NULL;
scanEntry->nlist = 0;
scanEntry->offset = InvalidOffsetNumber;
scanEntry->isFinished = false;
scanEntry->reduceResult = false;
/* Add it to so's array */
if (so->totalentries >= so->allocentries)
{
so->allocentries *= 2;
so->entries = (GinScanEntry *)
repalloc(so->entries, so->allocentries * sizeof(GinScanEntry));
}
so->entries[so->totalentries++] = scanEntry;
return scanEntry;
}
