Struct Sampled 

pub struct Sampled {
    pub columns: Vec<String>,
    pub nests: Option<bool>,
    pub columns_differ: bool,
    pub types_differ: bool,
    pub read: usize,
    pub headerless: bool,
}

What a spread of a directory’s files says about whether they are one table.

One sampling, read once, answering both questions asked of it: whether the files nest, which decides what Enter does, and whether they agree, which decides what the dataset says about itself. Taking them separately meant reading the same three files twice and, worse, letting the two answers disagree.

Fields

columns: Vec<String>

Every column name any sampled file has, first seen first. Empty when nothing could be read.

nests: Option<bool>

Whether every sampled file’s columns are within the widest one’s. None where fewer than two files could be read, which decides nothing.

columns_differ: bool

Whether a column one file has is missing from another. The table is then their union, and a row from a file without the column reads null.

types_differ: bool

Whether a shared column has two types (amount Int64 in one file, String where a row said N/A): the read silently widens it for the whole directory otherwise.

read: usize

How many files were read, so a count over them is known exact or a floor.

headerless: bool

Whether the files seem headerless, so the “names” are each file’s first data row. Such a directory needs --no-header to read as one table; this replaces any nesting verdict or column note.

Implementations

impl Sampled

pub fn disagreement(&self) -> Disagreement

How the files differ, for the note that says so.

Trait Implementations

impl Clone for Sampled

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Sampled

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Sampled

fn default() -> Self

Returns the “default value” for a type.