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[FEA] Support HALF_UP and HALF_EVEN rounding to a set number of decimal places #3790

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revans2 opened this issue Jan 15, 2020 · 2 comments · Fixed by #6685
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[FEA] Support HALF_UP and HALF_EVEN rounding to a set number of decimal places #3790

revans2 opened this issue Jan 15, 2020 · 2 comments · Fixed by #6685
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feature request New feature or request libcudf Affects libcudf (C++/CUDA) code. Spark Functionality that helps Spark RAPIDS

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@revans2
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revans2 commented Jan 15, 2020

Is your feature request related to a problem? Please describe.
This might need to wait for #3556 to work. There is also a lot of overlap with #1270.

We want to implement the spark functions round and bround. Each of them round a number to a set number of decimal places. One uses HALF_EVEN rounding the other uses HALF_UP rounding.

https://en.wikipedia.org/wiki/Rounding#Rounding_to_the_nearest_integer

We would like APIs to support both, for all numeric types (Floating point, Integer, and fixed point decimal when that is ready)

Describe the solution you'd like
I just want something that can do this. Not sure if a Binary op is the right way for this because it does not fit with the rest of the binary ops.

Describe alternatives you've considered
I'm not sure there is a good alternative.
@revans2 revans2 added feature request New feature or request Needs Triage Need team to review and classify labels Jan 15, 2020
@kkraus14 kkraus14 added libcudf Affects libcudf (C++/CUDA) code. Spark Functionality that helps Spark RAPIDS and removed Needs Triage Need team to review and classify labels Jan 21, 2020
@razajafri
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What's the status of this feature?

@harrism
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harrism commented Apr 27, 2020

#3751 (comment)

Like any feature request, needs motivation to prioritize it relative to everything else.

@revans2 revans2 mentioned this issue May 28, 2020
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@nartal1 nartal1 mentioned this issue Oct 16, 2020
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@codereport codereport mentioned this issue Oct 20, 2020
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@codereport codereport self-assigned this Oct 20, 2020
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harrism added a commit that referenced this issue Nov 8, 2020
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Implement cudf::round decimal32 & decimal64 (HALF_UP and `HAL…
3d44ed5 
…F_EVEN`) (#6685)

This PR is the final of 3 PRs and resolves #3790.

    Implement cudf::round floating point and integer types (HALF_UP) #6562
    Implement cudf::round floating point and integer types (HALF_EVEN) #6647
    Implement cudf::round decimal32 & decimal64 (HALF_UP and HALF_EVEN) arrow_backward

The PR to do list is as follows:

Add code for adjusted type of resulting column
Add implementation for half_up positive
Add implementation for half_up zero
Add implementation for half_up negative
Add implementation for half_even positive
Add implementation for half_even zero
Add implementation for half_even negative
Update documentation
Add basic unit tests
Add comprehensive unit tests
Refactor leveraging the factor that EVERY fixed_point function object is identical fire

Co-authored-by: Mark Harris <[email protected]>
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feature request New feature or request libcudf Affects libcudf (C++/CUDA) code. Spark Functionality that helps Spark RAPIDS
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[REVIEW] Implement cudf::round decimal32 & decimal64 (HALF_UP and HALF_EVEN) codereport/cudf
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@harrism @revans2 @kkraus14 @razajafri @codereport