Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/19813#discussion_r156088645 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala --- @@ -105,6 +105,11 @@ abstract class Expression extends TreeNode[Expression] { val isNull = ctx.freshName("isNull") val value = ctx.freshName("value") val eval = doGenCode(ctx, ExprCode("", isNull, value)) + + // Records current input row and variables of this expression. + eval.inputRow = ctx.INPUT_ROW + eval.inputVars = findInputVars(ctx, eval) --- End diff -- `eval.isNull = if (this.nullable) eval.isNull else "false"` seems ok.
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