gserialized_spgist_compress_nd()

PGDLLEXPORT Datum gserialized_spgist_compress_nd

(

PG_FUNCTION_ARGS

)

Definition at line 597 of file gserialized_spgist_nd.c.

{
        char gidxmem[GIDX_MAX_SIZE];
        GIDX *result = (GIDX *)gidxmem;
        long unsigned int i;
 
        POSTGIS_DEBUG(4, "[SPGIST] 'compress' function called");
 
        /* Input entry is null? Return NULL. */
        if (PG_ARGISNULL(0))
        {
                POSTGIS_DEBUG(4, "[SPGIST] null entry (!?!)");
                PG_RETURN_NULL();
        }
 
        /* Is the bounding box valid (non-empty, non-infinite) ?
         * If not, return NULL. */
        if (gserialized_datum_get_gidx_p(PG_GETARG_DATUM(0), result) == LW_FAILURE)
        {
                POSTGIS_DEBUG(4, "[SPGIST] empty geometry!");
                PG_RETURN_NULL();
        }
 
        POSTGIS_DEBUGF(4, "[SPGIST] got GIDX: %s", gidx_to_string(result));
 
        /* Check all the dimensions for finite values.
         * If not, use the "unknown" GIDX as a key */
        for (i = 0; i < GIDX_NDIMS(result); i++)
        {
                if (!isfinite(GIDX_GET_MAX(result, i)) || !isfinite(GIDX_GET_MIN(result, i)))
                {
                        gidx_set_unknown(result);
                        PG_RETURN_POINTER(result);
                }
        }
 
        /* Ensure bounding box has minimums below maximums. */
        gidx_validate(result);
 
        /* Return GIDX. */
        PG_RETURN_POINTER(gidx_copy(result));
}

References gidx_copy(), gidx_set_unknown(), gidx_validate(), and LW_FAILURE.

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