title: Unescape comma when reading CSV with spark
body: <p>I have a CSV file that contains name field with comma (,) escaped with <code>\</code></p>
  
  <pre><code>id,name
  "10","Ashraful\, Islam"
  </code></pre>
  
  <p>I am reading the csv file from pyspark</p>
  
  <pre><code>test = spark.read.format("csv").option("sep", ",").option("escape", "\\").option("inferSchema", "true").option("header", "true").load("test.csv")
  test.show()
  </code></pre>
  
  <p>The name should be <code>Ashraful, Islam</code>, but getting output</p>
  
  <pre><code>+---+----------------+
  | id|            name|
  +---+----------------+
  | 10|Ashraful\, Islam|
  +---+----------------+
  </code></pre>