Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/4373#discussion_r24131086
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/sources/interfaces.scala ---
@@ -158,6 +158,20 @@ trait CatalystScan extends BaseRelation {
}
@DeveloperApi
+/**
+ * ::DeveloperApi::
+ * A BaseRelation that can be used to insert data into it through the
insert method.
+ * If overwrite in insert method is true, the old data in the relation
should be overwritten with
+ * the new data. If overwrite in insert method is false, the new data
should be appended.
+ *
+ * InsertableRelation assumes that the data (Rows in the DataFrame)
provided to the insert method
+ * exactly matches the ordinal of fields in the schema of the BaseRelation.
+ * InsertableRelation assumes that the schema of this relation will not be
changed.
+ * Even if the insert method updates the schema, the new schema cannot be
used.
+ */
trait InsertableRelation extends BaseRelation {
+ /** If this relation treats fields with different nullability as the
same fields */
+ def ignoreNullability: Boolean
--- End diff --
I'd remove this and always assume `true`.
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