What is the correct way to extract values from an int8 array in SPI?

Hi,

I am using this code on 8.4/8.5, which works on 64-bit,
but segfaults on 32-bit Linux:

oids[0] = TEXTOID;
values[0] = lex;
nulls[0] = false;
ret = SPI_execute_with_args(
(just_title ?
"SELECT ids FROM product.t_product_inv_titleonly WHERE word
= $1"
: "SELECT ids FROM product.t_product_inv WHERE word = $1"),
1, oids, values, nulls, true, 1);
if (ret != SPI_OK_SELECT)
elog(ERROR, "SPI_execute_with_args(SELECT FROM
product.t_product_inv[_titleonly]) error (%d)", ret);
prod_inv = SPI_tuptable;

/* If no such record, quit */
if (SPI_processed == 0)
break;

// ids =
PointerGetDatum(PG_DETOAST_DATUM(SPI_getbinval(prod_inv->vals[0],
prod_inv->tupdesc, 1, &isnull)));
ids = SPI_getbinval(prod_inv->vals[0], prod_inv->tupdesc, 1, &isnull);
n_ids = DatumGetInt32(DirectFunctionCall2(array_length, ids,
Int32GetDatum(1)));
ids_arr = DatumGetArrayTypeP(ids);
ids_data = (Datum *) ARR_DATA_PTR(ids_arr);

/* Set up the initial indexes for binary search */
idx_min = 0;
idx_max = n_ids - 1;
idx_mid = (idx_max + idx_min) / 2;

elog(NOTICE, "n_ids %d idx_min %d idx_max %d idx_mid %d", n_ids,
idx_min, idx_max, idx_mid);

elog(NOTICE, "getting display_price of last element %" PRId64,
DatumGetInt64(ids_data[idx_max]));

Field "ids" in the above query is an int8[] array
with SET STORAGE EXTERNAL.
Executing DatumGetInt64(ids_data[idx_max]) in
the last elog() call segfaults in 32-bit. It doesn't matter
if the SPI_getbinval() call above is detoasted or not.
How can I extract individual elements from the int8[]
Datum correctly?

Thanks in advance,
Zoltán Böszörményi

--
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----------------------------------
Zoltán Böszörményi
Cybertec Schönig & Schönig GmbH
http://www.postgresql.at/