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Document usage of JSONEachrow reader #2890
Description
Summary
Document briefly what is the idea and where to find examples
Define responsibilities
Note that feature is in beta
Also look into this comment:
JacksonJsonParserFactory builds a default ObjectMapper with no special number policy, while GsonJsonParserFactory uses ToNumberPolicy.BIG_DECIMAL so UInt64 and decimal JSON values are not materialized as Double. With JSON_DISABLE_NUMBER_QUOTING, Jackson-backed readers can lose precision or infer the wrong types for large integers and decimals.
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