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https://issues.apache.org/jira/browse/SPARK-17130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15426490#comment-15426490
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Sean Owen commented on SPARK-17130:
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Yeah, didn't you just comment on https://github.com/apache/spark/pull/14555 ?
that's already being fixed there. This is a duplicate of SPARK-16965
> SparseVectors.apply and SparseVectors.toArray have different returns when
> creating with a illegal indices
> ---------------------------------------------------------------------------------------------------------
>
> Key: SPARK-17130
> URL: https://issues.apache.org/jira/browse/SPARK-17130
> Project: Spark
> Issue Type: Bug
> Components: ML, MLlib
> Affects Versions: 1.6.2, 2.0.0
> Environment: spark 1.6.1 + scala
> Reporter: Jon Zhong
> Priority: Minor
>
> One of my colleagues ran into a bug of SparseVectors. He called the
> Vectors.sparse(size: Int, indices: Array[Int], values: Array[Double]) without
> noticing that the indices are assumed to be ordered.
> The vector he created has all value of 0.0 (without any warning), if we try
> to get value via apply method. However, SparseVector.toArray will generates a
> array using a method that is order insensitive. Hence, you will get a 0.0
> when you call apply method, while you can get correct result using toArray or
> toDense method. The result of SparseVector.toArray is actually misleading.
> It could be safer if there is a validation of indices in the constructor or
> at least make the returns of apply method and toArray method the same.
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