GitHub user WeichenXu123 opened a pull request:
https://github.com/apache/spark/pull/18798
[SPARK-19634][ML] Multivariate summarizer - dataframes API
## What changes were proposed in this pull request?
This patch adds the DataFrames API to the multivariate summarizer (mean,
variance, etc.). In addition to all the features of
MultivariateOnlineSummarizer, it also allows the user to select a subset of the
metrics.
## How was this patch tested?
Testcases added.
## Performance
Resolve several performance issues in #17419, further optimization pending
on SQL team's work. One of the SQL layer performance has been resolved in
#18712, thanks @liancheng and @cloud-fan
I will paste test result later.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/WeichenXu123/spark
SPARK-19634-dataframe-summarizer
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18798.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 #18798
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commit 281d54681558692b0c799271fe8935234981222e
Author: WeichenXu <[email protected]>
Date: 2017-07-30T01:13:28Z
init pr
commit 28603901cab2295040af3077e58521f5efc69478
Author: WeichenXu <[email protected]>
Date: 2017-07-30T06:25:18Z
optimize summarizer buffer
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