[jira] [Updated] (SPARK-56654) Enforce strict Unicode validation in JSON parsing

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-56654?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated SPARK-56654:
-----------------------------------
    Labels: pull-request-available  (was: )

> Enforce strict Unicode validation in JSON parsing
> -------------------------------------------------
>
>                 Key: SPARK-56654
>                 URL: https://issues.apache.org/jira/browse/SPARK-56654
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>    Affects Versions: 4.0.0
>            Reporter: jahnavi
>            Priority: Major
>              Labels: pull-request-available
>   Original Estimate: 96h
>  Remaining Estimate: 96h
>
> The JVM execution path uses a Jackson-based parser (e.g., ReaderBasedJsonParser), which is permissive. It does not strictly validate Unicode surrogate pairs and will accept invalid sequences such as a lone high surrogate (\uD835). When this happens, it silently replaces the invalid character with a placeholder (?) and returns a parsed result.
>  
> The alternative execution like simdjson uses a stricter JSON parser this is used in photon in Databricks. It explicitly checks for correct surrogate pairing and rejects malformed sequences. As a result, it returns NULL for try_parse_json or throws an error for parse_json.
>  
> Because of this difference:
>  
> The same input JSON can be rejected in one execution path and accepted (with data corruption) in another.



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