JuliaData / JuliaData/DataFramesMeta.jl
`groupby` derived columns
Open
Nobody has claimed this yet.
- Dominant language
- Julia
- Stars
- 496
- Forks
- 56
- PR merge metrics
- No merged PRs in 30d
Description
Related to #383 it would be nice to be able to group by the result of functions applied to columns. The most common case for me is:
df.year = year.(df.date)
groupby(df, :year)
It would be nice to just do
@groupby df :date => year
(Syntax TBD of course)
Contributor guide
No contributing guide indexed for this repository
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reading related issue #383 and the existing @groupby/groupby behavior. The issue names no implementation file or test; done means agreeing on syntax and behavior for grouping by a function applied to a column, then covering that behavior with tests.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- julia
- Domain
- data
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100