/*
* Extract the label datums of the nodes within innerTuple
*
* Returns NULL if label datums are NULLs
*/
Datum *
spgExtractNodeLabels(SpGistState *state, SpGistInnerTuple innerTuple)
{
Datum *nodeLabels;
int nullcount = 0;
int i;
SpGistNodeTuple node;
nodeLabels = (Datum *) palloc(sizeof(Datum) * innerTuple->nNodes);
SGITITERATE(innerTuple, i, node)
{
if (IndexTupleHasNulls(node))
nullcount++;
else
nodeLabels[i] = SGNTDATUM(node, state);
}
if (nullcount == innerTuple->nNodes)
{
/* They're all null, so just return NULL */
pfree(nodeLabels);
return NULL;
}
if (nullcount != 0)
elog(ERROR, "some but not all node labels are null in SPGiST inner tuple");
return nodeLabels;
}
SGITITERATE(innerTuple, i, node)
{
if (IndexTupleHasNulls(node))
elog(ERROR, "some but not all node labels are null in SPGiST inner tuple");
nodeLabels[i] = SGNTDATUM(node, state);
}
