ropensci/drake: Big data formats

Version 7.6.0 New features

• Support specialized data storage via a decorated cache and format argument of target() (#971). This allows users to leverage faster ways to save and load targets, such as write_fst() for data frames and save_model_hdf5() for Keras models. It also improves memory because it prevents storr from making a serialized in-memory copy of large data objects.
• Add tidyselect functionality for ... in progress(), analogous to loadd(), build_times(), and clean().
• Support S3 for user-defined generics (#959). If the generic do_stuff() and the method stuff.your_class() are defined in envir, and if do_stuff() has a call to UseMethod("stuff"), then drake's code analysis will detect stuff.your_class() as a dependency of do_stuff().
• Add authentication support for file_in() URLs. Requires the new curl_handles argument of make() and drake_config() (#981).

• Make drake_plan(transform = slice()) understand .id and grouping variables (#963).
• Repair clean(garbage_collection = TRUE, destroy = TRUE). Previously it destroyed the cache before trying to collect garbage.
• Ensure that r_make() passes informative error messages back to the calling process (#969).
• Avoid downloading full contents of URLs when rehashing (#982)
• Retain upstream grouping variables of map() and cross() on topologically side-by-side targets (#983).
• Manually enforce the correct ordering in dsl_left_outer_join() so cross() selects the right combinations of existing targets (#986). This bug was probably introduced in the solution to #983.
• Make the output of progress() more consistent, less dependent on whether tidyselect is installed.

• Document DSL keywords as if they were true functions: target(), map(), split(), cross(), and combine() (#979).
• Do garbage collection between the unloading and loading phases of memory management.
• Keep file_out() files in clean() unless garbage_collection is TRUE. That way, make(recover = TRUE) is a true "undo button" for clean(). clean(garbage_collection = TRUE) still removes data in the cache, as well as any file_out() files from targets currently being cleaned.
• The menu in clean() only appears if garbage_collection is TRUE. Also, this menu is added to rescue_cache(garbage_collection = TRUE).
• Reorganize the internal code files and functions to make development easier.
• Move the history inside the cache folder .drake/. The old .drake_history/ folder was awkward. Old histories are migrated during drake_config(), and drake_history().
• Add lifecycle badges to exported functions.