[jira] [Assigned] (SPARK-35912) [SQL] JSON read behavior is different depending on the cache setting when nullable is false.

["Hyukjin Kwon (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-35912?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyukjin Kwon reassigned SPARK-35912:
------------------------------------

    Assignee: Fu Chen

> [SQL] JSON read behavior is different depending on the cache setting when nullable is false.
> --------------------------------------------------------------------------------------------
>
>                 Key: SPARK-35912
>                 URL: https://issues.apache.org/jira/browse/SPARK-35912
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 3.1.1
>            Reporter: Heedo Lee
>            Assignee: Fu Chen
>            Priority: Minor
>
> Below is the reproduced code.
>  
> {code:java}
> import org.apache.spark.sql.Encoders
>  
> case class TestSchema(x: Int, y: Int)
> case class BaseSchema(value: TestSchema)
>  
> val schema = Encoders.product[BaseSchema].schema
> val testDS = Seq("""{"value":{"x":1}}""", """{"value":{"x":2}}""").toDS
> val jsonDS = spark.read.schema(schema).json(testDS)
> jsonDS.show
> +---------+
> |    value|
> +---------+
> |{1, null}|
> |{2, null}|
> +---------+
> jsonDS.cache.show
> +------+
> | value|
> +------+
> |{1, 0}|
> |{2, 0}|
> +------+
> {code}
>  
> The above result occurs when a schema is created with a nested StructType and nullable of StructField is false.
>  



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