clouds created SPARK-43770:
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             Summary: request unlimited DecimalType
                 Key: SPARK-43770
                 URL: https://issues.apache.org/jira/browse/SPARK-43770
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.4.0
            Reporter: clouds


In https://issues.apache.org/jira/browse/SPARK-9069 we removed unlimited 
DecimalType, and add a limit of precision could not exceed 38.

While is is insufficient for decoding UInt256 (e.g. from clickhouse).

Shall we increase the limitation or introduce a new Type like 
`UnlimitedDecimalType`



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