remove useless code and support more spark version

nebula-exchange_spark_3.0/src/main/scala/com/vesoft/nebula/exchange/Exchange.scala

@@ -79,7 +79,7 @@ object Exchange {
 
     val spark = session.getOrCreate()
     // check the spark version
-    SparkValidate.validate(spark.version, "3.0.*", "3.1.*", "3.2.*", "3.3.*")
+    SparkValidate.validate(spark.version, "3.0.*", "3.1.*", "3.2.*", "3.3.*", "3.4.*", "3.5.*")
     val startTime                      = System.currentTimeMillis()
     var totalClientBatchSuccess: Long  = 0L
     var totalClientBatchFailure: Long  = 0L

nebula-exchange_spark_3.0/src/main/scala/com/vesoft/nebula/exchange/reader/FileBaseReader.scala

@@ -86,30 +86,3 @@ class CSVReader(override val session: SparkSession, csvConfig: FileBaseSourceCon
       .csv(path)
   }
 }
-
-/**
-  * The CustomReader extend the FileBaseReader and support read text file from HDFS.
-  * Transformation is a function convert a line into Row.
-  * The structure of the row should be specified.
-  *
-  * @param session
-  * @param customConfig
-  * @param transformation
-  * @param structType
-  */
-abstract class CustomReader(override val session: SparkSession,
-                            customConfig: FileBaseSourceConfigEntry,
-                            transformation: String => Row,
-                            filter: Row => Boolean,
-                            structType: StructType)
-    extends FileBaseReader(session, customConfig.path) {
-
-  override def read(): DataFrame = {
-    val encoder = RowEncoder.apply(structType)
-    session.read
-      .text(path)
-      .filter(!_.getString(0).isEmpty)
-      .map(row => transformation(row.getString(0)))(encoder)
-      .filter(filter)
-  }
-}