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

["jahnavi (Jira)" <ji...@apache.org>]

jahnavi created SPARK-56654:
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             Summary: 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


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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