Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/20647#discussion_r170159543
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/DataSourceV2Relation.scala
---
@@ -107,17 +106,24 @@ case class DataSourceV2Relation(
}
/**
- * A specialization of DataSourceV2Relation with the streaming bit set to
true. Otherwise identical
- * to the non-streaming relation.
+ * A specialization of [[DataSourceV2Relation]] with the streaming bit set
to true.
+ *
+ * Note that, this plan has a mutable reader, so Spark won't apply
operator push-down for this plan,
--- End diff --
are you suggesting we should open a JIRA to fix the internal document? We
usually fix them in related PRs that touch the class...
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