Asynchroneous display of results

Some queries behave like ``` select seq, sleep(1) from seq_1_to_10000

Examples

One class of queries is data comparison:

select * from a where not exists (select 1 from b where b.x = a.x);

Or checking (CHECKSUM_IS_OK() being an expensive stored function):

select * from t where not CHECKSUM_IS_OK(t.x);

The moment the first row appears, you know that the datasets are different. When you have seen 10 rows, you know the structure of the data missing in b and you can kill the query and debug. If no rows appear, of course the comparison has to run to the end.

Look fol SQL LIMIT keywod Heidi has nothing to do with that