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my @vals = split /\|/, $DocumentReference;
for my $V (@vals) {
...
        push @{$where{DocumentRef}{'-in'}}, $V;
    }
}

$SQL .= ' IN (' . join(", ", @{$where{DocumentRef}{'-in'}}), ') ';

$SQL .= join(' OR ', map { "LIKE $_ " } @{$where{DocumentRef}{'-like'}
+});