Function variant_to_json_string

pub fn variant_to_json_string(
    variant: &Variant<'_, '_>,
) -> Result<String, ArrowError>

Convert [Variant] to JSON String

This is a convenience function that converts a Variant to a JSON string. This is the same as calling variant_to_json with a Vec. It’s the simplest way to get a JSON representation when you just need a String result.

Arguments

• variant - The Variant value to convert

Returns

• Ok(String) containing the JSON representation
• Err with error details if conversion fails

Examples

let variant = Variant::Int32(42);
let json = variant_to_json_string(&variant)?;
assert_eq!(json, "42");

Example: Create a [Variant::Object] and convert to JSON

This example shows how to create an object with two fields and convert it to JSON:

{
  "first_name": "Jiaying",
  "last_name": "Li"
}

let mut builder = VariantBuilder::new();
// Create an object builder that will write fields to the object
let mut object_builder = builder.new_object();
object_builder.insert("first_name", "Jiaying");
object_builder.insert("last_name", "Li");
object_builder.finish();
// Finish the builder to get the metadata and value
let (metadata, value) = builder.finish();
// Create the Variant and convert to JSON
let variant = Variant::try_new(&metadata, &value)?;
let json = variant_to_json_string(&variant)?;
assert_eq!(r#"{"first_name":"Jiaying","last_name":"Li"}"#, json);