GitHub user zhengruifeng opened a pull request:
https://github.com/apache/spark/pull/19084
[SPARK-20711][ML]MultivariateOnlineSummarizer incorrect min/max for NaN
value
## What changes were proposed in this pull request?
current impl of min/max ignore `NaN`
for a column only containing `NaN`, `Double.MaxValue` will be returned for
`min` and `Double.MinValue` will be returned for `max`
min/max for column containing `NaN` should return `NaN`
## How was this patch tested?
existing tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/zhengruifeng/spark min_max
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19084.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #19084
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commit f6c75b918dd4fd8848fc22989309e317fc101dc6
Author: Zheng RuiFeng <ruife...@foxmail.com>
Date: 2017-08-30T02:01:55Z
create pr
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