Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17293#discussion_r124450617
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/types/StructType.scala ---
@@ -370,8 +370,8 @@ case class StructType(fields: Array[StructField])
extends DataType with Seq[Stru
*
* 1. If A and B have the same name and data type, they are merged to a
field C with the same name
* and data type. C is nullable if and only if either A or B is
nullable.
- * 2. If A doesn't exist in `that`, it's included in the result schema.
- * 3. If B doesn't exist in `this`, it's also included in the result
schema.
+ * 2. If A doesn't exist in `that`, it's included in the result schema
with nullable.
+ * 3. If B doesn't exist in `this`, it's also included in the result
schema with nullable.
--- End diff --
good catch!
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