sum12 commented on a change in pull request #1451:
URL: https://github.com/apache/arrow-rs/pull/1451#discussion_r838163495



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File path: arrow/src/json/reader.rs
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@@ -589,11 +592,13 @@ impl Decoder {
         schema: SchemaRef,
         batch_size: usize,
         projection: Option<Vec<String>>,
+        format_strings: Option<HashMap<String, String>>,

Review comment:
       I often wondered too. Wouldn't it allow the parser to diverge from 
schema ? We would need a runtime validation of what schema says and formaters 
actually return.




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