Reuse memory in parsing ndjson with a known (at runtime) schema


Is there a crate or mechanism over which we can parse njson without the allocations associated with serde_json?

Specifically, given

let data = r#"
{"a":"hello", "b": 1}
{"a":null, "b": 3}

we could go about in serde_json and iterate over every row and convert each to Value::object. However, for a large number of lines, there is an optimization over which we pre-allocate something like vec![Value; 10] and read over the ndjson every 10 lines, re-using the pre-allocated vector of values.

Is there something like that available as a crate or API?

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