Features:

qsv has several features:

• jemallocator (default) - use the jemalloc allocator (see Memory Allocator for more info).
• mimalloc - use the mimalloc 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.
• get - enable get command. Gets tabular data from various sources into a content-addressed disk cache, with dc: cache references usable as input to other commands.
• get_cloud - extends get with cloud object-store sources (s3://, gs://, az://).
• foreach - enable foreach command.
• geocode - enable geocode & geoconvert commands.
• clipboard - enable clipboard command.
• color - enable color command. Enables colorized tabular output. When the polars feature is also enabled, supports multiple non-CSV formats.
• 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, pivotp, scoresql and sqlp and enables polars mode in count). It also enables support for reading .parquet, .ipc/.arrow and .json/.jsonl formats as well as .csv.gz, .csv.zst and .csv.zlib compressed files.
  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 3.11 & 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.
• synthesize - enable synthesize command. Generates statistically-faithful synthetic CSVs from a source CSV using stats + frequency plus, optionally, semantic Content Types from a Data Dictionary to pick realistic fake-rs fakers.
• viz - enable viz command. Generates interactive Plotly charts (bar, line, scatter, histogram, box, pie, heatmap, candlestick, ohlc, sankey, radar, and a smart auto-dashboard) as self-contained, browser-openable HTML.
• viz_static - extends viz with static image export (PNG/SVG/PDF/JPEG/WebP) via plotly_static. Requires a headless browser (Chrome or Firefox) and a webdriver at runtime (webdriver is auto-downloaded).
• profile - enable profile command. Extracts and infers DCAT-3/Croissant metadata from a CSV using a scheming spec.
• geoconnex - extends profile with the geoconnex profile for hydrologic/water-data federations (JSON-LD output).
• magika - enable Magika-powered, AI-based file type detection in the sniff command for enhanced MIME type identification. Falls back to the file-format crate in qsvlite/qsvdp variants. Not available on MUSL builds.
• mcp - enable log command and MCP (Model Context Protocol) skill JSON generation for AI agent integration.
• 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 50% of the time when qsv is invoked with no command, 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.
• ui - enables commands that require linking UI libraries - clipboard, color, lens and prompt. Disable this feature if you're building for a headless environment. Note that qsvdp and qsvlite does not enable the ui feature by default.

Special Features for building qsv binary variants:

• feature_capable - enable to build qsv binary variant which is feature-capable. Also used by qsvmcp. (mutually exclusive with lite and datapusher_plus)

  • all_features - shortcut to build qsv binary variant with all features enabled (apply,fetch,foreach,geocode,geoconnex,get,get_cloud,luau,magika,mcp,polars,profile,synthesize,to,viz_static,self_update,ui).

• qsvmcp - enable to build qsvmcp binary variant - optimized for MCP server use with geocode, get, get_cloud, mcp, polars, profile, self_update, synthesize, to, and viz_static features. Shares src/main.rs with qsv. (mutually exclusive with lite and datapusher_plus)

• lite - enable to build qsvlite binary variant with all features disabled. (mutually exclusive with feature_capable and datapusher_plus)

• datapusher_plus - enable to build qsvdp binary variant - the DataPusher+ optimized qsv binary. Pulls in geocode, get, get_cloud, polars, profile, and self_update. (mutually exclusive with feature_capable and lite)

• nightly - enable to turn on nightly-only features when building with Rust nightly/unstable. Specifically: crc32fast/nightly, pyo3/nightly, rand/simd_support, simd-json/hints and foldhash/nightly. Note that Polars has its own separate nightly-polars feature.

• distrib_features - enable to build qsv binary variant with the core distribution features enabled (apply, fetch, foreach, geocode, geoconnex, get, get_cloud, luau, mcp, polars, profile, synthesize, to, viz_static) - i.e. all features except self_update, ui, magika, and python. This should make it easier for distro packagers to build qsv as qsv removes and adds features over time.