Anatoly Nikitin
Anatoly Nikitin
@altavir I've added KDocs for major interfaces, please, check if it's clearer now.
Thank you for quick reply. I'm currently writing KDocs and comments for the library. Probably I'll not be able cover the whole codebase, so your requests for clarification of particular...
Our current idea is to use Arrow as a backend for primitive types. See https://github.com/Kotlin/dataframe/issues/78
Arrow should give significant performance increase for JVM due to nullable values types support. Current implementation generates quite a lot of boxing/unboxing. It can be solved without Arrow, but I...
Hi, @hfazai. As far as I understand, you need hierarchical grouping of rows, so that `df.groupBy { a then b }` will return `DataFrame` with a single row for every...
Currently this is the only way to perform something similar to nested rows:
> My actual workaround is to sort Values on the rows and try to span them `df.pivot { smoker then gender }.groupBy { day and time }.sortBy { day and...
Let's discuss implementation. An obvious solution is to add `GroupedDataRow` that will store value for the first grouping key and nested `DataFrame` with other grouping keys. It will be similar...
And we also should add `groupBy { a then b }`.
I think that sorting should be performed explicitly, because in some cases original order of rows must be preserved. We can add `.asc()` and `.desc()` modifiers in column selector, similar...