Output is empty - dataframe

Question

I am new to scala. I have written a sample code which reads from csv after taking reference from websites. I am executing the code in Databricks. Here is the sample one
import org.apache.spark.sql.SparkSession
import org.apache.spark.SparkConf
import java.io.FileNotFoundException
import java.io.IOException
import spark.implicits._
import org.apache.spark.sql.types._
import org.apache.spark.sql.functions._
object Sample{
def main(args:Array[String]){
val conf = new SparkConf().setAppName("Read_Events").setMaster("yarn-cluster")
val spark = SparkSession.builder().config(conf).enableHiveSupport().getOrCreate()
val schema = StructType(List(
StructField("id", LongType, nullable = true),
StructField("name", StringType, nullable = true),
StructField("value", StringType, nullable = true),
StructField("timestamp", LongType, nullable = true)))//Creating the schema
try{
val myDF = spark.read.schema(schema).option("header", "true").option("delimiter", ",").csv("dbfs/FileStore/shared_uploads/tru.csv")
myDF.show()
}
catch {
case ex: FileNotFoundException =>{
println("Input file not available in path")
}
case ex: IOException => {
println("IO Exception")
}}
}
}
Seems the df.show() is not outputting
Seems I am doing something wrong. Any guidance would be Great!

Answer 1

In this code, you have created an object called Sample inside which you have code for reading the csv.
When I implemented the same code, it gave the following output. But myDf.show() does not give any output as well.
Here, we defined only the Sample object. We need to run the main() function in this Sample object to get the output. You can use the following code:
%scala
Sample.main(Array())
NOTE: Instead of this, you can directly write the contents of main() function in a scala cell to get the output directly.