text: drop table if exists t1, t2;
  create table t1 ( a int, b int );
  create table t2 UNDER t1 (a int);
  --csql crashed for below:
  create index i1 on t1(a) with online;
  
  show index from t1;
  show index from t2;
  
  drop table t1, t2;
  