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https://issues.apache.org/jira/browse/SPARK-33136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17213448#comment-17213448
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Jungtaek Lim commented on SPARK-33136:
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will submit a PR soon.
> Handling nullability for complex types is broken during resolution of V2
> write command
> --------------------------------------------------------------------------------------
>
> Key: SPARK-33136
> URL: https://issues.apache.org/jira/browse/SPARK-33136
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0, 3.0.1, 3.1.0
> Reporter: Jungtaek Lim
> Priority: Major
>
> I figured out Spark 3.x cannot write to complex type with nullable if
> matching column type in DataFrame is non-nullable.
> For example,
> {code:java}
> case class StructData(a: String, b: Int)
> case class Data(col_b: Boolean, col_i: Int, col_l: Long, col_f: Float, col_d:
> Double, col_s: String, col_fi: Array[Byte], col_bi: Array[Byte], col_de:
> Double, col_st: StructData, col_li: Seq[String], col_ma: Map[Int,
> String]){code}
> `col_st.b` would be non-nullable in DataFrame, which should not matter when
> we insert from DataFrame to the table which has `col_st.b` as nullable.
> (non-nullable to nullable should be possible)
> This looks to be broken in V2 write command.
>
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