Today, a bug in a development version of Hibernate 6.0 reminded me of
problem that Firebird has with query expressions, specifically with
parentheses around selects.
Specifically, SQL:2016 specifies the following:
```
::=
[ ]
[ ] [ ] [ ]
::=
| UNION [ ALL | DISTINCT ]
ISQL is adding an unnecessary COMMIT WORK statement to the extracted metadata
script before starting the Stored functions headers/bodies statements
---
Freeing the statement with DSQL_close, DSQL_drop or DSQL_unprepare is
deferred (since the v11 protocol). As a result, the free is only sent
when something else is subsequently sent over the connection.
I wonder if this makes sense for DSQL_drop and DSQL_unprepare, because
the end result is tha
