title: Rename whitespace in column name in Parquet file using spark sql
body: <p>I want to show the content of the parquet file using Spark Sql but since the column names in parquet file contains space I am getting error - 
  <em>Attribute name "First Name" contains invalid character(s) among " ,;{}()\n\t=". Please use alias to rename it.;</em></p>
  
  <p>I have written below code - </p>
  
  <pre><code>val r1 = spark.read.parquet("filepath")
  val r2 = r1.toDF()
  r2.select(r2("First Name").alias("FirstName")).show()
  </code></pre>
  
  <p>but still getting same error</p>