Chunked fread
Nobody has claimed this yet.
Assessment
- Difficulty
- 5/5
- Estimated time
- Over a week
- Newbie friendliness
- 30/100
Research direction
Start with the existing fread entry point and the proposed fread.apply interface, then review the linked StackOverflow discussion for the chunking use case. Done should mean applying fun to successive data table chunks no larger than chunk.size, with the interface and behavior agreed upon.
Written by the indexing model from the issue text.
Description
Consider a case when there's a large csv file, but it can be processed by chunks. It would be nice if fread could read the file in chunks. See also Reading in chunks at a time using fread in package data.table on StackOverflow.
The interface would be something like fread.apply(input, fun, chunk.size = 1000, ...), where fun would be applied (similar to lapply) to subsequent data table chunks read from input of the size at most chunk.size.
If there's a consensus, I could work on a PR.
- Dominant language
- R
- Stars
- 3.9k
- Forks
- 1.1k
- Avg merge
- 14h 4m
- Merged PRs (30d)
- 4
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.
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