tustvold commented on code in PR #5364: URL: https://github.com/apache/arrow-rs/pull/5364#discussion_r1477319172
########## arrow-json/src/writer.rs: ########## @@ -74,7 +74,39 @@ //! [`LineDelimitedWriter`] and [`ArrayWriter`] will omit writing keys with null values. //! In order to explicitly write null values for keys, configure a custom [`Writer`] by //! using a [`WriterBuilder`] to construct a [`Writer`]. - +//! +//! ## Writing to [serde_json] JSON Objects +//! +//! To serialize [`RecordBatch`]es into an array of +//! [JSON](https://docs.serde.rs/serde_json/) objects you can reparse the resulting JSON string. +//! Note that this is less efficient than using the `Writer` API. +//! +//! ``` +//! # use std::sync::Arc; +//! # use arrow_array::{Int32Array, RecordBatch}; +//! # use arrow_schema::{DataType, Field, Schema}; +//! # use serde_json::{Map, Value}; +//! +//! let schema = Schema::new(vec![Field::new("a", DataType::Int32, false)]); +//! let a = Int32Array::from(vec![1, 2, 3]); +//! let batch = RecordBatch::try_new(Arc::new(schema), vec![Arc::new(a)]).unwrap(); +//! +//! // Write the record batch out as a JSON array +//! let json_string = { +//! let buf = Vec::new(); +//! let mut writer = arrow_json::ArrayWriter::new(buf); +//! writer.write_batches(&vec![&batch]).unwrap(); +//! writer.finish().unwrap(); +//! String::from_utf8(writer.into_inner()).unwrap() Review Comment: FWIW you could use from_reader instead of from_str to avoid needing this -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
