Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/19811#discussion_r156923234 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/GenerateMutableProjection.scala --- @@ -57,41 +57,35 @@ object GenerateMutableProjection extends CodeGenerator[Seq[Expression], MutableP case _ => true }.unzip val exprVals = ctx.generateExpressions(validExpr, useSubexprElimination) - val projectionCodes = exprVals.zip(index).map { + val projectionCodes: Seq[(String, String, String, Int)] = exprVals.zip(index).map { --- End diff -- add a comment to explain this tuple-4
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