github.com/matrixorigin/matrixone@v1.2.0/test/distributed/cases/function/func_string_uuid.test (about)

     1  create table t1(a INT,  b float);
     2  insert into t1 values(12124, -4213.413), (12124, -42413.409);
     3  SELECT length(uuid()) FROM t1;
     4  SELECT uuid(1) FROM t1;
     5  drop table t1;