_postgis_gserialized_index_extent()

Datum _postgis_gserialized_index_extent

(

PG_FUNCTION_ARGS

)

Definition at line 2375 of file gserialized_estimate.c.

{
        GBOX *gbox = NULL;
        int key_type;
        int16 att_num, idx_att_num = InvalidAttrNumber;
        Oid tbl_oid = PG_GETARG_DATUM(0);
        char *col = text_to_cstring(PG_GETARG_TEXT_P(1));
        Oid idx_oid;
 
        if(!tbl_oid)
                PG_RETURN_NULL();
 
        /* We need to initialize the internal cache to access it later via postgis_oid() */
        postgis_initialize_cache();
 
        att_num = get_attnum(tbl_oid, col);
        if (att_num == InvalidAttrNumber)
                PG_RETURN_NULL();
 
        idx_oid = table_get_spatial_index(tbl_oid, att_num, &key_type, &idx_att_num);
        if (!idx_oid)
                PG_RETURN_NULL();
 
        gbox = spatial_index_read_extent(idx_oid, idx_att_num, key_type);
        if (!gbox)
                PG_RETURN_NULL();
        else
                PG_RETURN_POINTER(gbox);
}

References spatial_index_read_extent(), and table_get_spatial_index().

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