Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/21405#discussion_r200236723
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/javaCode.scala
---
@@ -22,14 +22,17 @@ import java.lang.{Boolean => JBool}
import scala.collection.mutable.ArrayBuffer
import scala.language.{existentials, implicitConversions}
+import org.apache.spark.sql.catalyst.trees.TreeNode
import org.apache.spark.sql.types.{BooleanType, DataType}
/**
* Trait representing an opaque fragments of java code.
*/
-trait JavaCode {
+trait JavaCode extends TreeNode[JavaCode] {
--- End diff --
I think it is ok. Currently `ExprValue` doesn't have to be `TreeNode`.
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