Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/14322
**After the PR changes**, the whole-stage codegen output is like:
```JAVA
== Subtree 1 / 1 ==
*Scan json [value#37L] Format: JSON, InputPaths:
file:/private/var/folders/4b/sgmfldk15js406vk7lw5llzw0000gn/T/spark-8ac18be7-053f-4498-bf59-5ed87...,
PushedFilters: [], ReadSchema: struct<value:bigint>
Generated code:
/* 001 */ public Object generate(Object[] references) {
/* 002 */ return new GeneratedIterator(references);
/* 003 */ }
/* 004 */
/* 005 */ final class GeneratedIterator extends
org.apache.spark.sql.execution.BufferedRowIterator {
/* 006 */ private Object[] references;
/* 007 */ private org.apache.spark.sql.execution.metric.SQLMetric
scan_numOutputRows;
/* 008 */ private scala.collection.Iterator scan_input;
/* 009 */
/* 010 */ public GeneratedIterator(Object[] references) {
/* 011 */ this.references = references;
/* 012 */ }
/* 013 */
/* 014 */ public void init(int index, scala.collection.Iterator inputs[])
{
/* 015 */ partitionIndex = index;
/* 016 */ this.scan_numOutputRows =
(org.apache.spark.sql.execution.metric.SQLMetric) references[0];
/* 017 */ scan_input = inputs[0];
/* 018 */ }
/* 019 */
/* 020 */ protected void processNext() throws java.io.IOException {
/* 021 */ while (scan_input.hasNext()) {
/* 022 */ InternalRow scan_row = (InternalRow) scan_input.next();
/* 023 */ scan_numOutputRows.add(1);
/* 024 */ append(scan_row);
/* 025 */ if (shouldStop()) return;
/* 026 */ }
/* 027 */ }
/* 028 */ }
```
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