123|"ABC"|hello
124|"AB|hello all
125|A"B"|hellll

val myDf = session.sqlContext.read.format("csv")
      .option("charset", "UTF8")
      .option("inferSchema", "true")
      .option("quote","u0000")
      .schema(mySchema)
      .option("delimiter", "|")
      .option("nullValue", "")
      .option("treatEmptyValuesAsNulls", "true")
      .load("path to file")

myDf.repartition(1).write
      .format("com.databricks.spark.csv")
      .option("delimiter", "|")
      .save("Path to save file")

123|""ABC""|hello
124|""AB"|hello all
125|"A"B""|hellll

123|"ABC"|hello
124|"AB|hello all
125|A"B"|hellll