GitHub user tanejagagan opened a pull request:
https://github.com/apache/spark/pull/16497
[SPARK-19118] [SQL] Percentile support for frequency distribution table
## What changes were proposed in this pull request?
I have a frequency distribution table with following entries
Age, No of person
21, 10
22, 15
23, 18
..
..
30, 14
Moreover it is common to have data in frequency distribution format to
further calculate Percentile, Median. With current implementation
It would be very difficult and complex to find the percentile.
Therefore i am proposing enhancement to current Percentile and Approx
Percentile implementation to take frequency distribution column into
consideration
## How was this patch tested?
1) Enhanced
/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/aggregate/PercentileSuite.scala
to cover the additional functionality
2) Run some performance benchmark test with 20 million row in local
environment and did not see any performance degradation
Please review http://spark.apache.org/contributing.html before opening a
pull request.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/tanejagagan/spark branch-18940
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16497.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 #16497
----
commit c638fbc45047a250f7e41ad589e3f144d911e441
Author: gagan taneja <tanejagagan@gagans-macbook-pro.local>
Date: 2017-01-07T18:03:27Z
[SPARK-18940][SQL] Percentile and approximate percentile support for
frequency distribution table
commit 3740a0c7785e8480b889c8a99f639906d8a0d5a1
Author: gagan taneja <tanejagagan@gagans-macbook-pro.local>
Date: 2017-01-07T18:03:27Z
[SPARK-18940][SQL] Percentile and approximate percentile support for
frequency distribution table
commit 28cdb6652fe5c0953a749b9468548edfc9d42067
Author: gagan taneja <tanejagagan@gagans-macbook-pro.local>
Date: 2017-01-07T18:23:47Z
Merge branch 'branch-18940' of https://github.com/tanejagagan/spark into
branch-18940
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