Struct StringColumn 

pub struct StringColumn { /* private fields */ }

A column of text values (pond-ts kind: 'string'). A gap is an Arrow null; an empty string is a value, not a gap.

Held as an Arrow Utf8 array, or as a dictionary (Dictionary<Int32, Utf8>: each row an index into a list of distinct strings) when it was read that way from Arrow. Reading gives the same values either way; StringColumn::is_dictionary says which, and to_arrow writes it back the same way. Two columns are equal when they hold the same values, however each is held.

Implementations

impl StringColumn

pub fn from_options<S: AsRef<str>>( values: impl IntoIterator<Item = Option<S>>, ) -> Self

Build from optional values; None is a gap.

pub fn len(&self) -> usize

Number of values.

pub fn is_empty(&self) -> bool

true when there are no values.

pub fn get(&self, i: usize) -> Option<&str>

The value at i, or None for a gap. Panics if i is out of range.

pub fn iter(&self) -> impl Iterator<Item = Option<&str>> + '_

Iterate as Option<&str>.

pub fn missing_count(&self) -> usize

Number of gaps.

pub fn is_dictionary(&self) -> bool

True when held as a dictionary (see the type’s notes).

Trait Implementations

impl Clone for StringColumn

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 StringColumn

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

Formats the value using the given formatter.

impl From<StringColumn> for ColumnData

fn from(c: StringColumn) -> Self

Converts to this type from the input type.

impl From<StringColumn> for Labels

fn from(c: StringColumn) -> Self

Converts to this type from the input type.

impl PartialEq for StringColumn

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.