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FEATURES.md

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Features:

qsv has several features:

  • mimalloc (default) - use the mimalloc allocator (see Memory Allocator for more info).

  • jemallocator - use the jemalloc allocator (see Memory Allocator for more info).

  • apply - enable apply command. This swiss-army knife of CSV transformations is very powerful, but it has a lot of dependencies that increases both compile time and binary size.

  • fetch - enables the fetch & fetchpost commands.

  • foreach - enable foreach command.

  • geocode - enable geocode command.

  • lens - enable lens command.

  • luau - enable luau command. Embeds a Luau interpreter into qsv. Luau has type-checking, sandboxing, additional language operators, increased performance & other improvements over Lua. Luau is the DSL of qsv - as its statically linked, has a MUCH smaller footprint (in both file size and memory without having to deal with Python's infamous Global Interpreter Lock) & is faster (in both startup & execution time) than Python.

  • polars - enables all Polars-powered commands (currently, joinp and sqlp. Also enables polars mode in count). Note that Polars is a very powerful library, but it has a lot of dependencies that drastically increases both compile time and binary size.

  • prompt - enable prompt command.

  • python - enable py command. Note that qsv will look for the shared library for the Python version (Python 3.7 & above supported) it was compiled against & will abort on startup if the library is not found, even if you're NOT using the py command. Check Python section for more info. Though Luau is the preferred DSL for qsv for all the reasons stated above, Python is still the lingua franca of data wrangling.

  • to - enables the to command.

  • self_update - enable self-update engine, checking GitHub for the latest release. Note that if you manually built qsv, self-update will only alert you about new releases (it checks GitHub for the latest release 10% of the time upon startup unless the QSV_NO_UPDATE environment variable is set). It will NOT offer the choice to update itself to the prebuilt binaries published on GitHub.
    You need not worry that your manually built qsv will be overwritten by a self-update.
    To check if your qsv build will have the option to self-update, run qsv --version. If you see self_update in the enabled features, and QSV_KIND is prebuilt* at the end, then you have the option to self-update.

  • feature_capable - enable to build qsv binary variant which is feature-capable.

  • all_features - enable to build qsv binary variant with all features enabled (apply,fetch,foreach,geocode,lens,luau,polars,prompt,python,to,self_update).

  • lite - enable to build qsvlite binary variant with all features disabled.

  • datapusher_plus - enable to build qsvdp binary variant - the DataPusher+ optimized qsv binary.

  • nightly - enable to turn on nightly/unstable features in the crc32fast, hashbrown, polars, pyo3 & rand crates when building with Rust nightly/unstable.

  • distrib_features - enable to build qsv binary variant with all features enabled except self_update. This should make it easier for distro packagers to build qsv with all features enabled except self_update as qsv removes and adds features over time.

ℹ️ NOTE: qsvlite, as the name implies, always has non-default features disabled. qsv can be built with any combination of the above features using the cargo --features & --no-default-features flags. The prebuilt qsv binaries has all applicable features valid for the target platform.