--- /dev/null
+use strict;
+use warnings;
+
+our @Initial = (
+ sub {
+ # This upgrade step is identical to the 4.2.7 upgrade, but only
+ # runs on Oracle because 4.2.7 was originally released with
+ # flawed SQL which did not run on Oracle.
+ return unless RT->Config->Get('DatabaseType') eq 'Oracle';
+ RT->DatabaseHandle->dbh->do(<<EOSQL);
+ DELETE FROM Attributes
+ WHERE (Name = 'LinkValueTo' OR Name = 'IncludeContentForValue')
+ AND (LENGTH(Content) = 0 OR Content IS NULL)
+EOSQL
+ },
+);