Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19901#discussion_r155132337
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/nullExpressions.scala
---
@@ -72,16 +72,16 @@ case class Coalesce(children: Seq[Expression]) extends
Expression {
}
override def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
- ctx.addMutableState(ctx.JAVA_BOOLEAN, ev.isNull)
- ctx.addMutableState(ctx.javaType(dataType), ev.value)
+ val isNull = ctx.freshName("isNull")
--- End diff --
`coalesceTmpIsNull`
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