Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/19480#discussion_r144281860
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala
---
@@ -78,6 +78,20 @@ case class SubExprEliminationState(isNull: String,
value: String)
case class SubExprCodes(codes: Seq[String], states: Map[Expression,
SubExprEliminationState])
/**
+ * The main information about a new added function.
+ *
+ * @param functionName String representing the name of the function
+ * @param subclassName Optional value which is empty if the function is
added to
+ * the outer class, otherwise it contains the name of
the
+ * inner class in which the function has been added.
+ * @param subclassInstance Optional value which is empty if the function
is added to
+ * the superclass, otherwise it contains the name
of the
--- End diff --
superclass here too.
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