[Koha-bugs] [Bug 12082] New: hold statistics wizard can produce misleading results

[bugzilla-daemon at bugs.koha-community.org]

http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=12082

            Bug ID: 12082
           Summary: hold statistics wizard can produce misleading results
 Change sponsored?: ---
           Product: Koha
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P5 - low
         Component: Reports
          Assignee: gmcharlt at gmail.com
          Reporter: gmcharlt at gmail.com
        QA Contact: testopia at bugs.koha-community.org

The hold statistics wizards can produce or misleading incorrect results.  Here
are at least two circumstances:

Case 1:

- hold status = active column
- hold date = active row, with date range 3/1/2014-3/2/2014
- holding library: not blank
- home library: not blank

Because the filters get applied even if they're not selected as the row or
column, in this case the report doesn't count any bib-level requests that are
not yet filled or which were cancelled.  This is because the home/holding
library comes into play only if there is an item number set, which doesn't
happen for bib-level requests until the hold is captured.

This can result in a hard-to-explain situation where running a report on the
number of holds in the previous month can change over time as holds placed
towards the end of the month get filled.

Case 2:

- hold status = active column
- hold date = active row, with date range 3/1/2014-3/2/2014
- holding library blank
- home library blank

If there happens to be a case where, for a given date, the number of requests
of a given status is the same in both reserves and old_reserves, the fact that
a "UNION" is used rather than a "UNION ALL" means that only one set is counted.

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