title: In is(object, Cl) : error while fetching rows R
body: <p>I have a MySQL table I am attempting to access with R using RMySQL.</p>
  
  <p>There are 1690004 rows that should be returned from </p>
  
  <pre><code>dbGetQuery(con, "SELECT * FROM tablename WHERE export_date ='2015-01-29'")
  </code></pre>
  
  <p>Unfortunately, I receive the following warning messages:</p>
  
  <pre><code>In is(object, Cl) : error while fetching row
  In dbGetQuery(con, "SELECT * FROM tablename WHERE export_date ='2015-01-29'",  : pending rows
  </code></pre>
  
  <p>And only receive ~400K rows.</p>
  
  <p>If I break the query into several "fetches" using dbSendQuery, the warning messages start appearing after ~400K rows are received.</p>
  
  <p>Any help would be appreciated.</p>