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### What changes were proposed in this pull request? 1, add new foreach-like methods: foreach/foreachNonZero 2, add iterator: iterator/activeIterator/nonZeroIterator ### Why are the changes needed? see the [ticke](https://issues.apache.org/jira/browse/SPARK-30329) for details foreach/foreachNonZero: for both convenience and performace (SparseVector.foreach should be faster than current traversal method) iterator/activeIterator/nonZeroIterator: add the three iterators, so that we can futuremore add/change some impls based on those iterators for both ml and mllib sides, to avoid vector conversions. ### Does this PR introduce any user-facing change? Yes, new methods are added ### How was this patch tested? added testsuites Closes #26982 from zhengruifeng/vector_iter. Authored-by: zhengruifeng <ruifengz@foxmail.com> Signed-off-by: zhengruifeng <ruifengz@foxmail.com> |
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