It appears that DataFrame::create is a thin layer on top of the R data.frame call. The guarantee correctness, but also means the performance of an Rcpp routine which returns a large data frame is limited by the performance of data.frame -- which is utterly horrible.
In the current version of R, there's a trivial, but borderline evil, work around: build a list of lists meeting the basic requirements of a data frame (they all need to be of the same length, and each component list needs to be named) and set the type of the object to "data.frame". I have two questions: (1) Is it reasonable to anticipate that this hack will continue to work for the near future in R? (2) If so, would a patch to that effect be of interest to the developers?
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