Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/19813#discussion_r156115050 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala --- @@ -105,6 +105,12 @@ abstract class Expression extends TreeNode[Expression] { val isNull = ctx.freshName("isNull") val value = ctx.freshName("value") val eval = doGenCode(ctx, ExprCode("", isNull, value)) + eval.isNull = if (this.nullable) eval.isNull else "false" --- End diff -- any findings for the more aggressive approach? `val isNull = if (this.nullable) ...`
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