CSV data merged into hash:
{
  App1 => { cores => 2, cpu => 1.5, lang => "Perl", mem => 4 },
  App2 => { cores => 4, cpu => 2.5, lang => "Java", mem => 8 },
  App3 => { cores => 4, cpu => 2.8, lang => "Java", mem => 8 },
  App4 => { cores => 2, cpu => 2.8, lang => "PHP", mem => 4 },
  App5 => { cores => 2, cpu => 2.8, lang => "C#", mem => 8 },
}

Query data: apps with 2 cores:
App1
App4
App5