Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/993#discussion_r15330980
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/BoundAttribute.scala
---
@@ -28,61 +30,27 @@ import org.apache.spark.sql.Logging
* to be retrieved more efficiently. However, since operations like
column pruning can change
* the layout of intermediate tuples, BindReferences should be run after
all such transformations.
*/
-case class BoundReference(ordinal: Int, baseReference: Attribute)
- extends Attribute with trees.LeafNode[Expression] {
+case class BoundReference(ordinal: Int, dataType: DataType, nullable:
Boolean)
+ extends Expression with trees.LeafNode[Expression] {
type EvaluatedType = Any
- override def nullable = baseReference.nullable
- override def dataType = baseReference.dataType
- override def exprId = baseReference.exprId
- override def qualifiers = baseReference.qualifiers
- override def name = baseReference.name
+ def references = Set.empty
--- End diff --
override here
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