Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/14322
**Before the PR changes**, the whole-stage codegen output is like:
```JAVA
== Subtree 1 / 1 ==
*Project [value#37L]
+- *Scan json [value#37L,p1#39,p2#40,p3#41] Format: JSON, InputPaths:
file:/private/var/folders/4b/sgmfldk15js406vk7lw5llzw0000gn/T/spark-f7a4294a-2e1b-4f44-9ebb-1a5eb...,
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 */ private UnsafeRow project_result;
/* 010 */ private
org.apache.spark.sql.catalyst.expressions.codegen.BufferHolder project_holder;
/* 011 */ private
org.apache.spark.sql.catalyst.expressions.codegen.UnsafeRowWriter
project_rowWriter;
/* 012 */
/* 013 */ public GeneratedIterator(Object[] references) {
/* 014 */ this.references = references;
/* 015 */ }
/* 016 */
/* 017 */ public void init(int index, scala.collection.Iterator inputs[])
{
/* 018 */ partitionIndex = index;
/* 019 */ this.scan_numOutputRows =
(org.apache.spark.sql.execution.metric.SQLMetric) references[0];
/* 020 */ scan_input = inputs[0];
/* 021 */ project_result = new UnsafeRow(1);
/* 022 */ this.project_holder = new
org.apache.spark.sql.catalyst.expressions.codegen.BufferHolder(project_result,
0);
/* 023 */ this.project_rowWriter = new
org.apache.spark.sql.catalyst.expressions.codegen.UnsafeRowWriter(project_holder,
1);
/* 024 */ }
/* 025 */
/* 026 */ protected void processNext() throws java.io.IOException {
/* 027 */ while (scan_input.hasNext()) {
/* 028 */ InternalRow scan_row = (InternalRow) scan_input.next();
/* 029 */ scan_numOutputRows.add(1);
/* 030 */ boolean scan_isNull4 = scan_row.isNullAt(0);
/* 031 */ long scan_value4 = scan_isNull4 ? -1L :
(scan_row.getLong(0));
/* 032 */ project_rowWriter.zeroOutNullBytes();
/* 033 */
/* 034 */ if (scan_isNull4) {
/* 035 */ project_rowWriter.setNullAt(0);
/* 036 */ } else {
/* 037 */ project_rowWriter.write(0, scan_value4);
/* 038 */ }
/* 039 */ append(project_result);
/* 040 */ if (shouldStop()) return;
/* 041 */ }
/* 042 */ }
/* 043 */ }
```
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