https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=43102

--- Comment #14 from Kyle M Hall (khall) <[email protected]> ---
Created attachment 209521
  -->
https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=209521&action=edit
Bug 43102: (QA follow-up) Trim itemnumber subqueries to a single column

The itemnumber subqueries inherit the column list of the resultset they
are built from, so DBIC wraps them in a derived table carrying every
item column instead of a plain itemnumber subquery. They also fail
outright if the resultset carries a LIMIT, as MariaDB doesn't support
LIMIT inside an IN subquery.

This patch moves the subquery construction into a single helper that
selects only the itemnumber column and wraps the result in a derived
table via as_subselect_rs so a LIMIT stays legal.

The inherited ORDER BY is kept. Dropping it would make a limited
resultset select an arbitrary set of items rather than the first ones
in its order. The database ignores an ORDER BY in a derived table that
has no LIMIT, so it costs nothing in the usual case.

Test Plan:
1) Apply this patch
2) prove t/db_dependent/Koha/Items.t
3) Note all tests pass!

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