/*
* Forms union of oldtup and addtup, if union == oldtup then return NULL
*/
IndexTuple
gistgetadjusted(Relation r, IndexTuple oldtup, IndexTuple addtup, GISTSTATE *giststate)
{
bool neednew = false;
GISTENTRY oldentries[INDEX_MAX_KEYS],
addentries[INDEX_MAX_KEYS];
bool oldisnull[INDEX_MAX_KEYS],
addisnull[INDEX_MAX_KEYS];
Datum attr[INDEX_MAX_KEYS];
bool isnull[INDEX_MAX_KEYS];
IndexTuple newtup = NULL;
int i;
gistDeCompressAtt(giststate, r, oldtup, NULL,
(OffsetNumber) 0, oldentries, oldisnull);
gistDeCompressAtt(giststate, r, addtup, NULL,
(OffsetNumber) 0, addentries, addisnull);
for (i = 0; i < r->rd_att->natts; i++)
{
gistMakeUnionKey(giststate, i,
oldentries + i, oldisnull[i],
addentries + i, addisnull[i],
attr + i, isnull + i);
if (neednew)
/* we already need new key, so we can skip check */
continue;
if (isnull[i])
/* union of key may be NULL if and only if both keys are NULL */
continue;
if (!addisnull[i])
{
if (oldisnull[i] ||
!gistKeyIsEQ(giststate, i, oldentries[i].key, attr[i]))
neednew = true;
}
}
if (neednew)
{
/* need to update key */
newtup = gistFormTuple(giststate, r, attr, isnull, false);
newtup->t_tid = oldtup->t_tid;
}
return newtup;
}
/*
* Forms union of oldtup and addtup, if union == oldtup then return NULL
*/
IndexTuple
gistgetadjusted(Relation r, IndexTuple oldtup, IndexTuple addtup, GISTSTATE *giststate)
{
bool neednew = FALSE;
GISTENTRY oldentries[INDEX_MAX_KEYS],
addentries[INDEX_MAX_KEYS];
bool oldisnull[INDEX_MAX_KEYS],
addisnull[INDEX_MAX_KEYS];
IndexTuple newtup = NULL;
int i;
if (GistTupleIsInvalid(oldtup) || GistTupleIsInvalid(addtup))
return gist_form_invalid_tuple(ItemPointerGetBlockNumber(&(oldtup->t_tid)));
gistDeCompressAtt(giststate, r, oldtup, NULL,
(OffsetNumber) 0, oldentries, oldisnull);
gistDeCompressAtt(giststate, r, addtup, NULL,
(OffsetNumber) 0, addentries, addisnull);
for (i = 0; i < r->rd_att->natts; i++)
{
gistMakeUnionKey(giststate, i,
oldentries + i, oldisnull[i],
addentries + i, addisnull[i],
attrS + i, isnullS + i);
if (neednew)
/* we already need new key, so we can skip check */
continue;
if (isnullS[i])
/* union of key may be NULL if and only if both keys are NULL */
continue;
if (!addisnull[i])
{
if (oldisnull[i] || gistKeyIsEQ(giststate, i, oldentries[i].key, attrS[i]) == false)
neednew = true;
}
}
if (neednew)
{
/* need to update key */
newtup = gistFormTuple(giststate, r, attrS, isnullS, false);
newtup->t_tid = oldtup->t_tid;
}
return newtup;
}
static void
supportSecondarySplit(Relation r, GISTSTATE *giststate, int attno, GIST_SPLITVEC *sv, Datum oldL, Datum oldR)
{
bool leaveOnLeft = true,
tmpBool;
GISTENTRY entryL,
entryR,
entrySL,
entrySR;
gistentryinit(entryL, oldL, r, NULL, 0, FALSE);
gistentryinit(entryR, oldR, r, NULL, 0, FALSE);
gistentryinit(entrySL, sv->spl_ldatum, r, NULL, 0, FALSE);
gistentryinit(entrySR, sv->spl_rdatum, r, NULL, 0, FALSE);
if (sv->spl_ldatum_exists && sv->spl_rdatum_exists)
{
float penalty1,
penalty2;
penalty1 = gistpenalty(giststate, attno, &entryL, false, &entrySL, false) +
gistpenalty(giststate, attno, &entryR, false, &entrySR, false);
penalty2 = gistpenalty(giststate, attno, &entryL, false, &entrySR, false) +
gistpenalty(giststate, attno, &entryR, false, &entrySL, false);
if (penalty1 > penalty2)
leaveOnLeft = false;
}
else
{
GISTENTRY *entry1 = (sv->spl_ldatum_exists) ? &entryL : &entryR;
float penalty1,
penalty2;
/*
* there is only one previously defined union, so we just choose swap
* or not by lowest penalty
*/
penalty1 = gistpenalty(giststate, attno, entry1, false, &entrySL, false);
penalty2 = gistpenalty(giststate, attno, entry1, false, &entrySR, false);
if (penalty1 < penalty2)
leaveOnLeft = (sv->spl_ldatum_exists) ? true : false;
else
leaveOnLeft = (sv->spl_rdatum_exists) ? true : false;
}
if (leaveOnLeft == false)
{
/*
* swap left and right
*/
OffsetNumber *off,
noff;
Datum datum;
SWAPVAR(sv->spl_left, sv->spl_right, off);
SWAPVAR(sv->spl_nleft, sv->spl_nright, noff);
SWAPVAR(sv->spl_ldatum, sv->spl_rdatum, datum);
gistentryinit(entrySL, sv->spl_ldatum, r, NULL, 0, FALSE);
gistentryinit(entrySR, sv->spl_rdatum, r, NULL, 0, FALSE);
}
if (sv->spl_ldatum_exists)
gistMakeUnionKey(giststate, attno, &entryL, false, &entrySL, false,
&sv->spl_ldatum, &tmpBool);
if (sv->spl_rdatum_exists)
gistMakeUnionKey(giststate, attno, &entryR, false, &entrySR, false,
&sv->spl_rdatum, &tmpBool);
sv->spl_ldatum_exists = sv->spl_rdatum_exists = false;
}
