Gengliang Wang created SPARK-39749:
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Summary: Use plain string representation on casting Decimal to
String
Key: SPARK-39749
URL: https://issues.apache.org/jira/browse/SPARK-39749
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.4.0
Reporter: Gengliang Wang
Assignee: Gengliang Wang
Currently, casting decimal as string type will result in Strings with
exponential notations if the adjusted exponent is less than -6. This is
consistent with BigDecimal.toString
[https://docs.oracle.com/javase/8/docs/api/java/math/BigDecimal.html#toString]
This is different from external databases like PostgreSQL/Oracle/MS SQL server.
It doesn't compliant with the ANSI SQL standard either.
I suggest always using the plain string in the casting.
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