_postgis_gserialized_joinsel()

Datum _postgis_gserialized_joinsel

(

PG_FUNCTION_ARGS

)

Definition at line 2137 of file gserialized_estimate.c.

{
        Oid table_oid1 = PG_GETARG_OID(0);
        text *att_text1 = PG_GETARG_TEXT_P(1);
        Oid table_oid2 = PG_GETARG_OID(2);
        text *att_text2 = PG_GETARG_TEXT_P(3);
        ND_STATS *nd_stats1, *nd_stats2;
        float8 selectivity = 0;
        int mode = 2; /* 2D mode by default */
 
 
        /* Retrieve the stats object */
        nd_stats1 = pg_get_nd_stats_by_name(table_oid1, att_text1, mode, false);
        nd_stats2 = pg_get_nd_stats_by_name(table_oid2, att_text2, mode, false);
 
        if ( ! nd_stats1 )
                elog(ERROR, "stats for \"%s.%s\" do not exist", get_rel_name(table_oid1), text_to_cstring(att_text1));
 
        if ( ! nd_stats2 )
                elog(ERROR, "stats for \"%s.%s\" do not exist", get_rel_name(table_oid2), text_to_cstring(att_text2));
 
        /* Check if we've been asked to not use 2d mode */
        if ( ! PG_ARGISNULL(4) )
        {
                text *modetxt = PG_GETARG_TEXT_P(4);
                char *modestr = text_to_cstring(modetxt);
                if ( modestr[0] == 'N' )
                        mode = 0;
        }
 
        /* Do the estimation */
        selectivity = estimate_join_selectivity(nd_stats1, nd_stats2);
 
        pfree(nd_stats1);
        pfree(nd_stats2);
        PG_RETURN_FLOAT8(selectivity);
}

References estimate_join_selectivity(), and pg_get_nd_stats_by_name().

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