[jira] [Created] (ZEPPELIN-747) Companion object in Scala isn't associating itself with case class

[Abou Haydar Elias (JIRA)]

Abou Haydar Elias created ZEPPELIN-747:
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             Summary: Companion object in Scala isn't associating itself with 
case class
                 Key: ZEPPELIN-747
                 URL: https://issues.apache.org/jira/browse/ZEPPELIN-747
             Project: Zeppelin
          Issue Type: Improvement
            Reporter: Abou Haydar Elias


Companion object in Scala isn't associating itself with case class and :paste 
mode isn't available to remedy to this problem.

The following code will generate the error concerning companion object 
association with it's case class.

{code}
import org.apache.spark.util.StatCounter

class NAStatCounter extends Serializable {
    val stats: StatCounter = new StatCounter()
    var missing: Long = 0
    def add(x: Double): NAStatCounter = {
        if (java.lang.Double.isNaN(x)) {
            missing += 1
        } else {
            stats.merge(x)
        }
        this
    }
    
    def merge(other: NAStatCounter): NAStatCounter = {
        stats.merge(other.stats)
        missing += other.missing
        this
    }
    
    override def toString = {
        "stats: " + stats.toString + " NaN: " + missing
    }
}

object NAStatCounter extends Serializable {
    def apply(x: Double) = new NAStatCounter().add(x)
} 
{code}

To solve this error, the scala/spark repl support the `paste mode` as described 
[here|https://www.safaribooksonline.com/library/view/scala-cookbook/9781449340292/ch14s03.html].

As for now, the only solution is to attach the class and object definition on 
the same line using a semi-colon as followed : 

{code}
import org.apache.spark.util.StatCounter

class NAStatCounter extends Serializable {
    val stats: StatCounter = new StatCounter()
    var missing: Long = 0
    def add(x: Double): NAStatCounter = {
        if (java.lang.Double.isNaN(x)) {
            missing += 1
        } else {
            stats.merge(x)
        }
        this
    }
    
    def merge(other: NAStatCounter): NAStatCounter = {
        stats.merge(other.stats)
        missing += other.missing
        this
    }
    
    override def toString = {
        "stats: " + stats.toString + " NaN: " + missing
    }
}; object NAStatCounter extends Serializable {
    def apply(x: Double) = new NAStatCounter().add(x)
} 
{code}

So what do you think ? Is it possible to support this paste mode ?



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