[jira] [Created] (SPARK-28589) Follow the type conversion rules of PostgreSQL

["Gengliang Wang (JIRA)" <ji...@apache.org>]

Gengliang Wang created SPARK-28589:
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             Summary: Follow the type conversion rules of PostgreSQL
                 Key: SPARK-28589
                 URL: https://issues.apache.org/jira/browse/SPARK-28589
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.0.0
            Reporter: Gengliang Wang
         Attachments: type_conversion.txt

The type conversion in current Spark can be improved by learning from PostgreSQL:
1. The table insertion should disallow certain type conversions(string -> int), see https://docs.google.com/document/d/1b9nnWWbKVDRp7lpzhQS1buv1_lDzWIZY2ApFs5rBcGI/edit#heading=h.82w8qxfl2uwl
2. Spark should return null result on cast an out-of-range value to an integral type, instead of returning a value with lower bits.
3. We can have a new optional mode: throw runtime exceptions on casting failures
4. improve the implicit casting




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