Rdatatable / Rdatatable/data.table
[R-Forge #5352] "promote" `roll` to a vector
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feature request
joins
- Dominant language
- R
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Description
Submitted by: Eduard Antonyan; Assigned to: Nobody; R-Forge link
That way one can specify how to join (roll, no roll, etc) for each of the columns being joined.
For reference, current behavior is to do a rolling join on the last column and a strict one on all of the others and this FR is to add the flexibility to the other columns.
Contributor guide
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 tracing data.table's current rolling-join behavior, which rolls only on the last column and uses strict joins on the others. Define how a vector of roll settings should control each joined column, then verify that mixed roll and no-roll combinations behave as requested.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- r
- Domain
- data
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 25/100