title: What does the `width` field mean in PostgreSQL's EXPLAIN?
body: <p>For example, from <a href="http://www.postgresql.org/docs/current/using-explain.html" rel="noreferrer">the EXPLAIN documentation</a>:</p>
  <pre>
  EXPLAIN SELECT * FROM tenk1;
  
                           QUERY PLAN
  -------------------------------------------------------------
   Seq Scan on tenk1  (cost=0.00..458.00 rows=10000 width=244)
  </pre>
  <p>What does <code>width=244</code> mean?</p>