Updated to scala 2.13 and spark 3.2.0-SNAPSHOT

build.sbt

@@ -4,14 +4,16 @@ organization := "com.github.mrpowers"
 name := "spark-daria"
 
 version := "1.0.0"
-crossScalaVersions := Seq("2.12.12")
-scalaVersion := "2.12.12"
-val sparkVersion = "3.0.1"
+crossScalaVersions := Seq("2.13.5")
+scalaVersion := crossScalaVersions.value.head
+val sparkVersion = "3.2.0-SNAPSHOT"
+
+resolvers += "Apache Snapshots" at "https://repository.apache.org/snapshots"
 
 libraryDependencies += "org.apache.spark"    %% "spark-sql"        % sparkVersion % "provided"
 libraryDependencies += "org.apache.spark"    %% "spark-mllib"      % sparkVersion % "provided"
 libraryDependencies += "com.github.mrpowers" %% "spark-fast-tests" % "1.0.0"      % "test"
-libraryDependencies += "com.lihaoyi"         %% "utest"            % "0.6.3"      % "test"
+libraryDependencies += "com.lihaoyi"         %% "utest"            % "0.7.9"      % "test"
 libraryDependencies += "com.lihaoyi"         %% "os-lib"           % "0.7.1"      % "test"
 testFrameworks += new TestFramework("com.github.mrpowers.spark.daria.CustomFramework")
 

src/main/scala/com/github/mrpowers/spark/daria/sql/functions.scala

@@ -121,9 +121,9 @@ object functions {
     val d = Option(delimiters).getOrElse(return None)
     val c = Option(colName).getOrElse(return None)
     // initialize the previousLetter to be the null character - the closest representation of the empty character: https://stackoverflow.com/questions/8306060/how-do-i-represent-an-empty-char-in-scala
-    var previousLetter: Char = '\0'
+    var previousLetter: Char = '\u0000'
     Some(c.map { letter: Char =>
-      if (d.contains(previousLetter) || previousLetter.equals('\0')) {
+      if (d.contains(previousLetter) || previousLetter.equals('\u0000')) {
         previousLetter = letter
         letter.toUpper
       } else {