title: Issues with JSON_EXTRACT in Presto for keys containing ' ' character
body: <p>I'm using Presto(0.163) to query data and am trying to extract fields from a json.</p>
  
  <p>I have a json like the one given below, which is present in the column 'style_attributes':</p>
  
  <pre><code>"attributes": {
      "Brand Fit Name": "Regular Fit",
      "Fabric": "Cotton",
      "Fit": "Regular",
      "Neck or Collar": "Round Neck",
      "Occasion": "Casual",
      "Pattern": "Striped",
      "Sleeve Length": "Short Sleeves",
      "Tshirt Type": "T-shirt"
  }
  </code></pre>
  
  <p>I'm unable to extract field 'Short Sleeves'.
  Below is the query i'm using:</p>
  
  <p>Select JSON_EXTRACT(style_attributes,'$.attributes.Sleeve Length') as length from table;</p>
  
  <p>The query fails with the following error- Invalid JSON path: '$.attributes.Sleeve Length'</p>
  
  <p>For fields without ' '(space), query is running fine.</p>
  
  <p>I tried to find the resolution in the Presto documentation, but with no success.</p>