Struct arrow_json::writer::WriterBuilder

pub struct WriterBuilder(/* private fields */);

JSON writer builder.

Implementations

impl WriterBuilder

pub fn new() -> Self

Create a new builder for configuring JSON writing options.

Example

fn example() -> Writer<File, LineDelimited> {
    let file = File::create("target/out.json").unwrap();

    // create a builder that keeps keys with null values
    let builder = WriterBuilder::new().with_explicit_nulls(true);
    let writer = builder.build::<_, LineDelimited>(file);

    writer
}

pub fn explicit_nulls(&self) -> bool

Returns true if this writer is configured to keep keys with null values.

pub fn with_explicit_nulls(self, explicit_nulls: bool) -> Self

Set whether to keep keys with null values, or to omit writing them.

For example, with LineDelimited format:

Skip nulls (set to false):

{"foo":1}
{"foo":1,"bar":2}
{}

Keep nulls (set to true):

{"foo":1,"bar":null}
{"foo":1,"bar":2}
{"foo":null,"bar":null}

Default is to skip nulls (set to false).

pub fn build<W, F>(self, writer: W) -> Writer<W, F>

where W: Write, F: JsonFormat,

Create a new Writer with specified JsonFormat and builder options.

Trait Implementations

impl Clone for WriterBuilder

fn clone(&self) -> WriterBuilder

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for WriterBuilder

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

Formats the value using the given formatter.

impl Default for WriterBuilder

fn default() -> WriterBuilder

Returns the “default value” for a type.