Github user sarutak commented on a diff in the pull request:
https://github.com/apache/spark/pull/11301#discussion_r55935199
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/trees/TreeNode.scala
---
@@ -418,6 +419,13 @@ abstract class TreeNode[BaseType <:
TreeNode[BaseType]] extends Product {
override def toString: String = treeString
+ def toOriginString: String =
+ if (this.origin.callSite.isDefined &&
!this.isInstanceOf[BoundReference]) {
--- End diff --
`AttributeReference` which is created with expression parsing is
transformed into `BoundReference` so we can't generate comment properly when
the query is like as follows.
```
SELECT col1, col2 FROM TBL WHERE ...
```
In the example above, col1 and col2 is parsed into `BoundReference` finally.
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