Gengliang Wang created SPARK-28018:
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Summary: Allow upcasting decimal to double/float
Key: SPARK-28018
URL: https://issues.apache.org/jira/browse/SPARK-28018
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.0.0
Reporter: Gengliang Wang
Currently, Spark only allows upcasting DecimalType to IntegralType or
DecimalType.
This PR proposes: if the target DecimalType is tighter than DoubleType or
FloatType, we can upcast it as well.
The upcasting matters because it blocks
https://github.com/apache/spark/pull/24806. E.g, if there is a table "t" with
only one column of double type,
```
INSERT INTO TABLE t SELECT 10.0
```
The data type of value 10.0 is DecimalType(3, 1). In the current code, the
upcasting failed.
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