[SPARK-6429] Implement hashCode and equals together

## What changes were proposed in this pull request?

Implement some `hashCode` and `equals` together in order to enable the scalastyle.
This is a first batch, I will continue to implement them but I wanted to know your thoughts.

Author: Joan <joan@goyeau.com>

Closes #12157 from joan38/SPARK-6429-HashCode-Equals.

2 files changed, 6 insertions, 0 deletions

diff --git a/mllib-local/src/main/scala/org/apache/spark/ml/linalg/Matrices.scala b/mllib-local/src/main/scala/org/apache/spark/ml/linalg/Matrices.scala
index baa04fb0fd..8204b5af02 100644
--- a/mllib-local/src/main/scala/org/apache/spark/ml/linalg/Matrices.scala
+++ b/mllib-local/src/main/scala/org/apache/spark/ml/linalg/Matrices.scala
@@ -458,6 +458,8 @@ class SparseMatrix (
       rowIndices: Array[Int],
       values: Array[Double]) = this(numRows, numCols, colPtrs, rowIndices, values, false)
 
+  override def hashCode(): Int = toBreeze.hashCode()
+
   override def equals(o: Any): Boolean = o match {
     case m: Matrix => toBreeze == m.toBreeze
     case _ => false
diff --git a/mllib-local/src/main/scala/org/apache/spark/ml/linalg/Vectors.scala b/mllib-local/src/main/scala/org/apache/spark/ml/linalg/Vectors.scala
index fd4ce9adb8..4275a22ae0 100644
--- a/mllib-local/src/main/scala/org/apache/spark/ml/linalg/Vectors.scala
+++ b/mllib-local/src/main/scala/org/apache/spark/ml/linalg/Vectors.scala
@@ -476,6 +476,8 @@ class DenseVector (val values: Array[Double]) extends Vector {
     }
   }
 
+  override def equals(other: Any): Boolean = super.equals(other)
+
   override def hashCode(): Int = {
     var result: Int = 31 + size
     var i = 0
@@ -602,6 +604,8 @@ class SparseVector (
     }
   }
 
+  override def equals(other: Any): Boolean = super.equals(other)
+
   override def hashCode(): Int = {
     var result: Int = 31 + size
     val end = values.length