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https://issues.apache.org/jira/browse/SPARK-35289?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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jingpan xiong updated SPARK-35289:
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Attachment: screenshot-1.png
> Make CatalogString contains nullable information
> ------------------------------------------------
>
> Key: SPARK-35289
> URL: https://issues.apache.org/jira/browse/SPARK-35289
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.1.1
> Reporter: hezuojiao
> Assignee: Apache Spark
> Priority: Major
> Attachments: screenshot-1.png
>
>
> When trying to cast ArrayType/MapType/StructType from containing NULL to not
> contain NULL, we will get a confusing failure message.
> Here's a example:
> {code:java}
> // new UT in CastSuite
> test("array casting") {
> val arrayContainsNull = Literal.create(Seq("contains", "null", null),
> ArrayType(StringType, containsNull = true))
> val ret = cast(arrayContainsNull, ArrayType(StringType, containsNull =
> false))
> assert(ret.resolved === false)
> // scalastyle:off println
> println(ret.typeCheckFailureMessage)
> // scalastyle:on println
> }
> {code}
> Failure massage:
> {code:java}
> cannot cast array<string> to array<string>{code}
> From the above error message, it is not clear why the error is reported,
> because the data type before and after is the same.
> Therefore, I think we need to specify nullable info for
> ArrayType/MapType?/StructType in the Catalog String to identify the reason
> for Cast Failures.
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