HyukjinKwon commented on a change in pull request #24176: [SPARK-27233] [SQL]DF
schema should match with table schema when converted to table
URL: https://github.com/apache/spark/pull/24176#discussion_r268060906
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/types/ArrayType.scala
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@@ -90,7 +90,7 @@ case class ArrayType(elementType: DataType, containsNull:
Boolean) extends DataT
override def sql: String = s"ARRAY<${elementType.sql}>"
override private[spark] def asNullable: ArrayType =
- ArrayType(elementType.asNullable, containsNull = true)
+ ArrayType(elementType.asNullable, containsNull)
Review comment:
Hey, `asNullable` should return it as nullable. This is a general problem
when you read it, it becomes nullable in SparkSQL file formats. We need to
revisit nullability (given the community discussion so far) in general, not
only specifically for this one.
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