Bug 18173: Remove DB field issues.return

The DB field issues.return has never really been used apparently.
I found the first occurrence of this field in
commit eac3a7b19a
CommitDate: Mon Mar 12 22:43:47 2001 +0000
    Database definition file, checked into cvs to make keeping database
    current easier

Since I did not find any use of this field.
I guess it can be removed safely.

There is no proper test plan here. Just make sure this field has never
been used.

Signed-off-by: Magnus Enger <magnus@libriotech.no>
I have not found any use of issues.return or old_issues.return. In
all my live instances the column is always NULL. Issuing and returning
seems to work as expected after the columns have been removed.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>

installer/data/mysql/atomicupdate/bug_18173.perl

@@ -0,0 +1,13 @@
+$DBversion = 'XXX';
+if( CheckVersion( $DBversion ) ) {
+    if ( column_exists( 'issues', 'return' ) ) {
+        $dbh->do(q|ALTER TABLE issues DROP column `return`|);
+    }
+
+    if ( column_exists( 'old_issues', 'return' ) ) {
+        $dbh->do(q|ALTER TABLE old_issues DROP column `return`|);
+    }
+
+    SetVersion( $DBversion );
+    print "Upgrade to $DBversion done (Bug 18173 - Remove issues.return DB field)\n";
+}

installer/data/mysql/kohastructure.sql

@@ -1743,7 +1743,6 @@ CREATE TABLE `issues` ( -- information related to check outs or issues
   `branchcode` varchar(10) default NULL, -- foreign key, linking to the branches table for the location the item was checked out
   `returndate` datetime default NULL, -- date the item was returned, will be NULL until moved to old_issues
   `lastreneweddate` datetime default NULL, -- date the item was last renewed
-  `return` varchar(4) default NULL,
   `renewals` tinyint(4) default NULL, -- lists the number of times the item was renewed
   `auto_renew` BOOLEAN default FALSE, -- automatic renewal
   `timestamp` timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP, -- the date and time this record was last touched
@@ -1772,7 +1771,6 @@ CREATE TABLE `old_issues` ( -- lists items that were checked out and have been r
   `branchcode` varchar(10) default NULL, -- foreign key, linking to the branches table for the location the item was checked out
   `returndate` datetime default NULL, -- date the item was returned
   `lastreneweddate` datetime default NULL, -- date the item was last renewed
-  `return` varchar(4) default NULL,
   `renewals` tinyint(4) default NULL, -- lists the number of times the item was renewed
   `auto_renew` BOOLEAN default FALSE, -- automatic renewal
   `timestamp` timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP, -- the date and time this record was last touched