title: generate_series() function missing PostgreSQL
body: <p>I'm having some trouble with my application. It works in my development environment but not on my customers server..</p>
  
  <p>The generate_series with timestamps does not work. The same function but with integers work.</p>
  
  <p><strong>Error message:</strong></p>
  
  <pre><code> [Request processing failed; nested exception is javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not execute query] with root cause
      org.postgresql.util.PSQLException: ERROR: function generate_series(unknown, unknown, interval) does not exist
        Hint: No function matches the given name and argument types. You might need to add explicit type casts.
  </code></pre>
  
  <p>I can't locate the function in PostgreSQL. Where can I get a copy of these methods so I can install them if possible. </p>