[GSoC] Dataframes for D

[Prateeek Nayak]

On Wednesday, 3 July 2019 at 05:04:20 UTC, Prateek Nayak wrote:
> On Saturday, 29 June 2019 at 04:39:39 UTC, Prateek Nayak wrote:
>> [snip]
> [snip]

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Progress Update
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The past couple of weeks went as expected without any Roadblocks

* groupBy can group a DataFrame based on arbitrary number of 
columns
* groupBy returns a Group structure which supports binary 
operations
* Retrieve single/multiple group as DataFrame.
* Merge two/more Group into a single DataFrame.
* Index operations on DataFrame. An entire column/row is returned 
as Axis the same way Index operation on DataFrame is implemented.
* Display Group on Terminal

Works on DataFrame
* Added short hand data operations which I missed before! \(°^°)/
* Added function to convert index to an operable data column and 
vice versa

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What is due this week
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This week was mostly reserved for refactor. Mr. Wilson introduced 
me to the beautiful lockstep in range and I worked it in the 
codebase wherever it's necessary.
This week I as adding ways to retrieve data as a Slice and assign 
Slice to DataFrame. This IMHO is important as ndslice is used 
widely and it opens a lot of doors for data computations. A way 
to easily retrieve data as Slice operate on it and assign the 
data back to DataFrame sees valuable. I hope to get the initial 
PR ready by the beginning of next week.

After this will bring Aggregate - on whole Frame/Group on a 
selected column/row of DataFrame or Group, selective operation on 
selective columns/rows.

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Future Roadblocks
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I can't see any obvious roadblocks but then you never do see them 
coming ¯\_(ツ)_/¯