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https://issues.apache.org/jira/browse/SPARK-47528?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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L. C. Hsieh reassigned SPARK-47528:
-----------------------------------
Assignee: L. C. Hsieh
> Add UserDefinedType support to DataTypeUtils.canWrite
> -----------------------------------------------------
>
> Key: SPARK-47528
> URL: https://issues.apache.org/jira/browse/SPARK-47528
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 4.0.0
> Reporter: L. C. Hsieh
> Assignee: L. C. Hsieh
> Priority: Major
>
> Our customer hits an issue recently when they tries to save a DataFrame
> containing some UDTs as table (`saveAsTable`). The error looks like:
> ```
> - Cannot write 'xxx': struct<...> is incompatible with struct<...>
> ```
> The catalog strings between two sides are actually same which makes the
> customer confused.
> It is because `DataTypeUtils.canWrite` doesn't handle `UserDefinedType`. If
> the `UserDefinedType`'s underlying sql type is same as read side, `canWrite`
> should return true for two sides.
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