CODEWITHSUNDEEP
scalah2o
Gavin Niu
Gavin Niu

Reputation: 1335

Is there a scala method I can use in if() to check if there is a Null value or not?

I tried to write this

package org.apache.spark.h2o.utils

import water.fvec.{NewChunk, Frame, Chunk}
import water._

class Miss extends MRTask{
  override def map(c: Chunk, nc: NewChunk): Unit = {
    for (row <- 0 until c.len()) {
      if(  ){  
       nc.addNum(1)
      }
      else
       nc.addNum(0)
    }
  }
}

What can I put in if (...) to check whether or not there is a null value in that row?

Upvotes: 0

Views: 171

Answers (1)

Michal
Michal

Reputation: 437

H2O provides Chunk API which focuses on efficient data processing and internally uses only primitive Java types. Hence, there is no null check but you can ask for missing value at given row:

if (c.isNA(row)) { ... } else { ... }

or shorter version for your example:

nc.addNum(c.isNA(row) ? 1 : 0)

Upvotes: 1

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