title: How data is stored physically in Bigtable
body: <p>Lets assume a table <code>test</code></p>
  
  <pre><code>                  cf:a          cf:b      yy:a      kk:cat
  "com.cnn.news"    zubrava10     sobaka    foobar
  "ch.main.users"   -             -         -         purrpurr
  </code></pre>
  
  <p>And the first cell ("zubrava") has 10 versions (10 timestamps) ("zubrava1", "zubrava2"...)</p>
  
  <p>How data of this table will be stored on disk?</p>
  
  <p>I mean is the primary index always</p>
  
  <pre><code>("row","column_family:column",timestamp) ?
  </code></pre>
  
  <p>So 10 versions of the same row for 10 timestamps will be stored together? How the entire table is stored?</p>
  
  <p>Is scan for all values of given column is as fast as in column-oriented models?</p>
  
  <pre><code>SELECT cf:a from test
  </code></pre>