Apache Spark commented on SPARK-23976:

User 'kiszk' has created a pull request for this issue:

> UTF8String.concat() or ByteArray.concat() may allocate shorter structure.
> -------------------------------------------------------------------------
>                 Key: SPARK-23976
>                 URL: https://issues.apache.org/jira/browse/SPARK-23976
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 2.3.0
>            Reporter: Kazuaki Ishizaki
>            Priority: Minor
> When the three inputs has `0x7FFF_FF00`, `0x7FFF_FF00`, and `0xE00`, the 
> current algorithm allocate the result structure with 0x1000 length due to 
> integer sum overflow.
> We should detect overflow.

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