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( sent_email is NULL OR
  sent_email='0000-00-00');

  sent_email => {'!=', undef },
  sent_email => {'!=', '0000-00-00

my @proc_requests = $schema->resultset( 'TblRequests' )->search({
  -or =>[ status => 'Review' ,  
...
  },
  { join => 'p' }
);