Trait arrow::compute::kernels::cast_utils::Parser

source · 
pub trait Parser: ArrowPrimitiveType {
    // Required method
    fn parse(string: &str) -> Option<Self::Native>;

    // Provided method
    fn parse_formatted(string: &str, _format: &str) -> Option<Self::Native> { ... }
}
Expand description

Specialized parsing implementations to convert strings to Arrow types.

This is used by csv and json reader and can be used directly as well.

§Example

To parse a string to a Date32Type:

use arrow_cast::parse::Parser;
use arrow_array::types::Date32Type;
let date = Date32Type::parse("2021-01-01").unwrap();
assert_eq!(date, 18628);

To parse a string to a TimestampNanosecondType:

use arrow_cast::parse::Parser;
use arrow_array::types::TimestampNanosecondType;
let ts = TimestampNanosecondType::parse("2021-01-01T00:00:00.123456789Z").unwrap();
assert_eq!(ts, 1609459200123456789);

Required Methods§

source

fn parse(string: &str) -> Option<Self::Native>

Parse a string to the native type

Provided Methods§

source

fn parse_formatted(string: &str, _format: &str) -> Option<Self::Native>

Parse a string to the native type with a format string

When not implemented, the format string is unused, and this method is equivalent to parse

Object Safety§

This trait is not object safe.

Implementors§