title: UseLegacySql=FALSE ignored, BigRQuery
body: <p>I am having some issues with BigRQuery not recognizing the <code>useLegacySql=false</code> argument in my <code>query_exec()</code> function. </p>
  
  <p>My call looks like <code>query_exec(query, project = project, useLegacySql = FALSE, max_pages = Inf)</code></p>
  
  <p>I have a few issues: </p>
  
  <p>1) When attempting a workaround by passing "#standardSQL..." in the query I get the error </p>
  
  <blockquote>
    <p>Error: 1.979 - 1.979: No query found</p>
  </blockquote>
  
  <p>2) When I pass <code>useLegacySql = false</code> I get: </p>
  
  <blockquote>
    <p>Error: 1.1 - 1.966: Unrecognized token UNION. [Try using standard SQL....]</p>
  </blockquote>
  
  <p>3) I have also tried this with <code>use_Legacy_Sql = false</code> with the same error:</p>
  
  <blockquote>
    <p>Error: 1.1 - 1.966: Unrecognized token UNION. [Try using standard SQL....]</p>
  </blockquote>
  
  <p>Is this a bug? </p>