[Firebird-devel] [FB-Tracker] Created: (CORE-4144) Error "context already in use (BLR error)" when preparing a query with UNION

[Vlad K. (JIRA) <tr...@fi...>]

Error "context already in use (BLR error)" when preparing a query with UNION 
-----------------------------------------------------------------------------

                 Key: CORE-4144
                 URL: http://tracker.firebirdsql.org/browse/CORE-4144
             Project: Firebird Core
          Issue Type: Bug
          Components: Engine
    Affects Versions: 2.5.2 Update 1
            Reporter: Vlad Khorsun


It was discovered when researching bug CORE-4005, but it is not depends on recursive queries.

Simplified example:

select n
  from
  (
     select d.rdb$relation_id  as n from rdb$database d
     union all
     select d.rdb$relation_id  as n from rdb$database d
  )

union all

select cast(1 as bigint) from rdb$database d


At prepare time error is raised:

Invalid token.
invalid request BLR at offset 24.
context already in use (BLR error).


The bug happens when :
- first member of UNION is derived table, and
- data type of first field of that derived table is impliciltly CAST'ed to the type of whole UNION (int -> bigint in example above)


-- 
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators: http://tracker.firebirdsql.org/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira