Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/8889#discussion_r40342337
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/LogicalRelation.scala
---
@@ -17,23 +17,44 @@
package org.apache.spark.sql.execution.datasources
import org.apache.spark.sql.catalyst.analysis.MultiInstanceRelation
-import org.apache.spark.sql.catalyst.expressions.{AttributeMap,
AttributeReference}
+import org.apache.spark.sql.catalyst.expressions.{Attribute, AttributeMap,
AttributeReference}
import org.apache.spark.sql.catalyst.plans.logical.{LeafNode, LogicalPlan,
Statistics}
import org.apache.spark.sql.sources.BaseRelation
/**
* Used to link a [[BaseRelation]] in to a logical query plan.
+ *
+ * Note that sometimes we need to use `LogicalRelation` to replace an
existing leaf node without
+ * changing the output attributes' IDs. The `expectedOutputAttributes`
parameter is used for
+ * this purpose.
--- End diff --
Probably it is better to have a link to the jira at here.
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