title: Spark not using spark.sql.parquet.compression.codec
body: <p>I'm comparing spark's parquets file vs apache-drill's.
  Drill's parquet are way more lightweight then spark's. Spark uses GZIP as compression codec as default, for experimenting I tried to change it to
  snappy : same size
  uncompressed: same size
  lzo : exception</p>
  
  <p>I tried both ways:</p>
  
  <pre><code>sqlContext.sql("SET spark.sql.parquet.compression.codec=uncompressed")
  sqlContext.setConf("spark.sql.parquet.compression.codec.", "uncompressed")
  </code></pre>
  
  <p>But seems like it dosen't change his settings</p>