_postgis_gserialized_sel()

Datum _postgis_gserialized_sel

(

PG_FUNCTION_ARGS

)

Definition at line 2096 of file gserialized_estimate.c.

{
        Oid table_oid = PG_GETARG_OID(0);
        text *att_text = PG_GETARG_TEXT_P(1);
        Datum geom_datum = PG_GETARG_DATUM(2);
        GBOX gbox; /* search box read from gserialized datum */
        float8 selectivity = 0;
        ND_STATS *nd_stats;
        int mode = 2; /* 2D mode by default */
 
        /* Check if we've been asked to not use 2d mode */
        if ( ! PG_ARGISNULL(3) )
                mode = text_p_get_mode(PG_GETARG_TEXT_P(3));
 
        /* Retrieve the stats object */
        nd_stats = pg_get_nd_stats_by_name(table_oid, att_text, mode, false);
 
        if ( ! nd_stats )
                elog(ERROR, "stats for \"%s.%s\" do not exist", get_rel_name(table_oid), text_to_cstring(att_text));
 
        /* Calculate the gbox */
        if ( ! gserialized_datum_get_gbox_p(geom_datum, &gbox) )
                elog(ERROR, "unable to calculate bounding box from geometry");
 
        POSTGIS_DEBUGF(3, " %s", gbox_to_string(&gbox));
 
        /* Do the estimation */
        selectivity = estimate_selectivity(&gbox, nd_stats, mode);
 
        pfree(nd_stats);
        PG_RETURN_FLOAT8(selectivity);
}

References estimate_selectivity(), gbox_to_string(), gserialized_datum_get_gbox_p(), pg_get_nd_stats_by_name(), and text_p_get_mode().

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