Github user kiszk commented on a diff in the pull request: https://github.com/apache/spark/pull/20035#discussion_r158082275 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/generators.scala --- @@ -214,11 +213,12 @@ case class Stack(children: Seq[Expression]) extends Generator { // Create the collection. val wrapperClass = classOf[mutable.WrappedArray[_]].getName - ctx.addMutableState( - s"$wrapperClass<InternalRow>", - ev.value, - v => s"$v = $wrapperClass$$.MODULE$$.make($rowData);", useFreshName = false) - ev.copy(code = code, isNull = "false") + ev.copy(code = + s""" + |InternalRow[] $rowData = new InternalRow[$numRows]; --- End diff -- I see. I did not imagine that `numRows` is large. I will revert the code for `rowData`.
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