dawidwys commented on issue #9781: [FLINK-14098] Support multiple statements 
for TableEnvironment.
URL: https://github.com/apache/flink/pull/9781#issuecomment-536464957
 
 
   Hi @wuchong, personally I think changing `List<Operation>` to 
`Iterable<Operation>` makes sense.
   
   I do have though bigger concerns regarding the lazy execution of queries and 
I wonder if we should not revisit that as well. The problem I see what happens 
if we have a sequence of statements like this:
   
   ```
   CREATE TABLE test (...) with (path = '/tmp1') ;
   INSERT INTO test SELECT ...
   DROP TABLE test;
   CREATE TABLE test (...) with (path = '/tmp2');
   
   tEnv.execute();
   ```
   
    If we execute the create statements eagerly and the queries lazily we will 
end up with wrong results.

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