[jira] [Assigned] (SPARK-28018) Allow upcasting decimal to double/float

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-28018?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-28018:
------------------------------------

    Assignee:     (was: Apache Spark)

> 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
>            Priority: Major
>
> 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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