Crate rudb_csv 

The CSV reader and writer, including dialect sniffing and type inference.

Rank 5 in the layer rule. See xtask/layers.toml and spec/18-package-layout.md.

A CSV file says nothing about itself. The delimiter, the quote, whether the first line names the columns and what type each column holds are all conventions, and a reader that has to be told them is a reader every loader script in the world has to be rewritten for. So this sniffs, the way DuckDB does, and every rule in it was read off duckdb v1.4.1 rather than reasoned about. Where the two differ, the difference is written down next to the code, because a sniffer that quietly disagrees produces a column of the wrong type and that is a wrong answer rather than a slow query.

Three pieces. scan turns bytes into fields, dialect works out the punctuation by running the scanner under each candidate and seeing which one is consistent, and infer walks a ladder of types to find the first one every value in a column fits. Reader is the three of them over a file, handing back chunks.

There is no writer yet. COPY t TO 'out.csv' is the statement that wants one and it is not bound, so a writer here would be a writer nothing calls.

Re-exports

pub use dialect::Dialect;

pub use reader::Reader;

Modules

dialect

What a CSV file’s punctuation is, and working it out from the bytes.

infer

What type a column of text is.

reader

A CSV file as chunks.

scan

Bytes into fields.

Constants

RANK

The crate this rank belongs to, so that the layer check has something to read.