title: Simple ST_WITHIN query returning no results
body: <p>I'm trying to get my head around Cosmos DB's <code>ST_WITHIN</code> function. I started out with something fairly complex but have had to whittle it down to something that I'm <em>certain</em> should work but doesn't.</p>
  
  <p>Consider:</p>
  
  <pre class="lang-sql prettyprint-override"><code>SELECT ST_WITHIN({ 'type': 'Point', 'coordinates': [ 0, 0 ] }, {'type':'Polygon','coordinates':[[[-150, -50], [-150, 50], [150, 50]]]}) FROM c
  </code></pre>
  
  <p>Why does this return an empty object for every record in <code>c</code>? That is, for 3 items in <code>c</code>, the results look like this:</p>
  
  <pre><code>[
      {},
      {},
      {}
  ]
  </code></pre>
  
  <p>At the very <em>least</em>, I would expect it to return <code>false</code> for every object rather than...nothing. But actually in this case I'd expect it to return <code>true</code>, since the point provided is within the polygon.</p>
  
  <p>I expect I'm doing something quite obviously wrong, but I can't figure out what. I've already tried enabling <code>Point</code>, <code>Line</code>, and <code>Polygon</code> indexes on the collection to no avail.</p>
  
  <p>Does anyone have any suggestions?</p>