Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/7434#discussion_r34757259
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/generators.scala
---
@@ -40,13 +40,14 @@ import org.apache.spark.sql.types._
* requested. The attributes produced by this function will be
automatically copied anytime rules
* result in changes to the Generator or its children.
*/
-abstract class Generator extends Expression {
- self: Product =>
+trait Generator extends Expression { self: Product =>
--- End diff --
how about:
```scala
trait Generator {
self: Expression =>
}
```
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