Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/19813#discussion_r156238152
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/BoundAttribute.scala
---
@@ -61,7 +61,11 @@ case class BoundReference(ordinal: Int, dataType:
DataType, nullable: Boolean)
override def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
if (ctx.currentVars != null && ctx.currentVars(ordinal) != null) {
val oev = ctx.currentVars(ordinal)
- ev.isNull = oev.isNull
+ if (nullable) {
--- End diff --
oh, right.
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