title: Spark replace \t with a tab
body: <p>I have a dataframe which has "\t" instead of tabs and I would like to replace these characters with actual tabs. Basically I want <code>"DP13037_A1_\tiphone 5S"</code> to become <code>"DP13037_A1_ iphone 5S"</code></p>
  
  <p>It seems it is possible to use <code>regexp_replace</code> for this purpose but maybe I am not using it correctly since it does not replace the "\t"s for me.</p>
  
  <p>Here is my code snippet:</p>
  
  <pre><code>snapshot.filter(snapshot(MERCHANT_ID).isin(BLACKLISTED_MERCHANTS: _*)).show(false)
      var finalSnapshot = snapshot.withColumn(SKU, regexp_replace(snapshot(SKU), "\t"," "))
      finalSnapshot.filter(finalSnapshot(MERCHANT_ID).isin(BLACKLISTED_MERCHANTS: _*)).show(false)
  </code></pre>
  
  <p>Is there an alternate way of doing this? </p>