anchor.diff:  
   -include_lib("eunit/include/eunit.hrl").
   
  -setup() -> 
  +setup() ->
       ?imem_test_setup.
   
  -teardown(_) -> 
  +teardown(_) ->
       catch imem_meta:drop_table(idx_index_test),
       catch imem_meta:drop_table(index_test),
       ?imem_test_teardown.
  
positive.code:             , fun test_with_sec/1
          ]}
      }.
      
  test_without_sec(_) -> 
      test_with_or_without_sec(false).
  
  test_with_sec(_) ->
  
negative.code: exec(SKey, {'drop index', {}, TableName}=_ParseTree, _Stmt, _Opts, IsSec) ->
      % ?LogDebug("Drop Index Parse Tree~n~p~n", [_ParseTree]),
      {TableSchema, Tbl} = imem_sql_expr:binstr_to_qname2(TableName),
      Table = if
          TableSchema =:= undefined ->
              {imem_meta:schema(),list_to_existing_atom(binary_to_list(Tbl))};
          true ->
  