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From "Maxim Gekk (JIRA)" <>
Subject [jira] [Created] (SPARK-23741) UTF8String must not return chars disallowed in UTF-8
Date Mon, 19 Mar 2018 21:16:00 GMT
Maxim Gekk created SPARK-23741:

             Summary: UTF8String must not return chars disallowed in UTF-8
                 Key: SPARK-23741
             Project: Spark
          Issue Type: Bug
          Components: Spark Core
    Affects Versions: 2.4.0
            Reporter: Maxim Gekk

Currently UTF8String methods can return chars that are disallowed in UTF-8 by Unicode standard.
In particular, the following first byte values are disallowed in UTF-8: C0–C1, F5–FF.
The full set of well-formed UTF-8 bytes sequences you can find in Table 3-7 of [Unicode 10.0
Standard|]. Example
of output such chars:

Such wrong UTF-8 chars must not be returned to users.

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