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view0

 full outer join
...
 view2.size = view3.size
 and
 view2.buffersize = view3.buffersize

use strict

my $last = 'view0';
...
    $last = $view;
    return @equality_clauses;
}

use strict;

my @views = ( 'view0', 'view1', 'view2', 'view3' );
...
    $last = $view;
    return @equality_clauses;
}