Struct polars_core::chunked_array::builder::Utf8ChunkedBuilder

pub struct Utf8ChunkedBuilder {
    pub builder: MutableUtf8Array<i64>,
    pub capacity: usize,
    /* private fields */
}

Fields

builder: MutableUtf8Array<i64>

capacity: usize

Implementations

impl Utf8ChunkedBuilder

pub fn new(name: &str, capacity: usize, bytes_capacity: usize) -> Self

Create a new UtfChunkedBuilder

Arguments

• capacity - Number of string elements in the final array.
• bytes_capacity - Number of bytes needed to store the string values.

pub fn append_value<S: AsRef<str>>(&mut self, v: S)

Appends a value of type T into the builder

pub fn append_null(&mut self)

Appends a null slot into the builder

pub fn append_option<S: AsRef<str>>(&mut self, opt: Option<S>)

pub fn finish(self) -> Utf8Chunked