***************   Case 1   ***************
flashback table t1 to before drop;
{
  "stmt_type":131,
  "flashback_table_arg": {
    "tenant_id":1,
    "origin_table_name":"t1",
    "new_db_name":"",
    "new_table_name":""
  }
}
***************   Case 2   ***************
flashback table t1 to before drop rename to t2;
{
  "stmt_type":131,
  "flashback_table_arg": {
    "tenant_id":1,
    "origin_table_name":"t1",
    "new_db_name":"rongxuan",
    "new_table_name":"t2"
  }
}
***************   Case 3   ***************
flashback database db1 to before drop;
{
  "stmt_type":130,
  "flashback_db_arg": {
    "tenant_id":1,
    "origin_db_name":"db1",
    "new_db_name":""
  }
}
***************   Case 4   ***************
flashback database db1 to before drop rename to db2;
{
  "stmt_type":130,
  "flashback_db_arg": {
    "tenant_id":1,
    "origin_db_name":"db1",
    "new_db_name":"db2"
  }
}
***************   Case 5   ***************
flashback schema db1 to before drop;
{
  "stmt_type":130,
  "flashback_db_arg": {
    "tenant_id":1,
    "origin_db_name":"db1",
    "new_db_name":""
  }
}
***************   Case 6   ***************
flashback schema db1 to before drop rename to db2;
{
  "stmt_type":130,
  "flashback_db_arg": {
    "tenant_id":1,
    "origin_db_name":"db1",
    "new_db_name":"db2"
  }
}
***************   Case 7   ***************
flashback tenant tenant1 to before drop;
{
  "stmt_type":129,
  "flashback_tenant_arg": {
    "tenant_id":1,
    "origin_tenant_name":"tenant1",
    "new_tenant_name":""
  }
}
***************   Case 8   ***************
flashback tenant tenant1 to before drop rename to tenant2;
{
  "stmt_type":129,
  "flashback_tenant_arg": {
    "tenant_id":1,
    "origin_tenant_name":"tenant1",
    "new_tenant_name":"tenant2"
  }
}
***************   Case 9   ***************
purge table t1;
{
  "stmt_type":136,
  "purge_table_arg": {
    "tenant_id":1,
    "table_name":"t1"
  }
}
***************   Case 10   ***************
purge database db1;
{
  "stmt_type":135,
  "purge_db_arg": {
    "tenant_id":1,
    "db_name":"db1"
  }
}
***************   Case 11   ***************
purge schema db1;
{
  "stmt_type":135,
  "purge_db_arg": {
    "tenant_id":1,
    "db_name":"db1"
  }
}
***************   Case 12   ***************
purge tenant tenant1;
{
  "stmt_type":134,
  "purge_tenant_arg": {
    "tenant_id":1,
    "tenant_name":"tenant1"
  }
}