Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/6660#discussion_r31858190
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
---
@@ -52,6 +53,45 @@ abstract class Expression extends TreeNode[Expression] {
def eval(input: Row = null): Any
/**
+ * Returns an [[GeneratedExpressionCode]], which contains Java source
code that
+ * can be used to generate the result of evaluating the expression on an
input row.
+ *
+ * @param ctx a [[CodeGenContext]]
+ * @return [[GeneratedExpressionCode]]
+ */
+ def gen(ctx: CodeGenContext): GeneratedExpressionCode = {
--- End diff --
I think that this can be `final`.
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