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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