[GitHub] [arrow] houqp commented on a change in pull request #8867: ARROW-10842 [Rust] decouple IO from json schema inference code

[GitBox <gi...@apache.org>]

houqp commented on a change in pull request #8867:
URL: https://github.com/apache/arrow/pull/8867#discussion_r538675155



##########
File path: rust/arrow/src/json/reader.rs
##########
@@ -250,19 +326,17 @@ pub fn infer_json_schema<R: Read>(
     reader: &mut BufReader<R>,
     max_read_records: Option<usize>,
 ) -> Result<SchemaRef> {
-    let mut values: HashMap<String, HashSet<DataType>> = HashMap::new();
-
-    let mut line = String::new();
-    for _ in 0..max_read_records.unwrap_or(std::usize::MAX) {
-        reader.read_line(&mut line)?;
-        if line.is_empty() {
-            break;
-        }
-        let record: Value = serde_json::from_str(&line.trim()).expect("Not valid JSON");

Review comment:
       that's right.




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