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Datum
get_incidences(PG_FUNCTION_ARGS)
{
        text          *relname = PG_GETARG_TEXT_P(0);
        RangeVar      *relrv;
        Relation      rel;
        Datum         result;
        Buffer        *buf;
        HeapTupleData tuple;
        ItemPointer   itemp;
        Datum         resultDatum;
        bool          x;

        // open relation
        relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
        rel = heap_openrv(relrv, AccessShareLock);

        itemp = (ItemPointer) palloc(sizeof(ItemPointerData));
        ItemPointerSet(itemp, 0, 2); // magic constants - it's will be filled from params
        tuple.t_self = *itemp;

        x = heap_fetch(rel, SnapshotNow, &tuple, &buf, true, NULL);

        resultDatum = datumCopy(HeapTupleGetDatum(&tuple), false, -1);

        PG_RETURN_DATUM(resultDatum);

}