gserialized_gist_distance()

Datum gserialized_gist_distance

(

PG_FUNCTION_ARGS

)

Definition at line 1330 of file gserialized_gist_nd.c.

{
        GISTENTRY *entry = (GISTENTRY *)PG_GETARG_POINTER(0);
        StrategyNumber strategy = (StrategyNumber)PG_GETARG_UINT16(2);
        char query_box_mem[GIDX_MAX_SIZE];
        GIDX *query_box = (GIDX *)query_box_mem;
        GIDX *entry_box;
        bool *recheck = (bool *)PG_GETARG_POINTER(4);
 
        double distance;
 
        POSTGIS_DEBUG(4, "[GIST] 'distance' function called");
 
        /* Strategy 13 is <<->> */
        /* Strategy 20 is |=| */
        if (strategy != 13 && strategy != 20)
        {
                elog(ERROR, "unrecognized strategy number: %d", strategy);
                PG_RETURN_FLOAT8(FLT_MAX);
        }
 
        /* Null box should never make this far. */
        if (gserialized_datum_get_gidx_p(PG_GETARG_DATUM(1), query_box) == LW_FAILURE)
        {
                POSTGIS_DEBUG(4, "[GIST] null query_gbox_index!");
                PG_RETURN_FLOAT8(FLT_MAX);
        }
 
        /* Get the entry box */
        entry_box = (GIDX *)PG_DETOAST_DATUM(entry->key);
 
        /* Strategy 20 is |=| */
        distance = gidx_distance(entry_box, query_box, strategy == 20);
 
        /* Treat leaf node tests different from internal nodes */
        if (GIST_LEAF(entry))
                *recheck = true;
 
        PG_RETURN_FLOAT8(distance);
}

References distance(), gidx_distance(), and LW_FAILURE.

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