Github user gengliangwang commented on the issue: https://github.com/apache/spark/pull/18409 Example: ```java codegenStringSeq(sql("select 1").queryExecution.executedPlan) ``` The example will return Seq[(String, String)] of length 1, containing the subtree as string and the corresponding generated code. The subtree as string: > (*Project [1 AS 1#0] > +- Scan OneRowRelation[] The generated code: ```java /* 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 scala.collection.Iterator[] inputs; /* 008 */ private scala.collection.Iterator inputadapter_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.inputs = inputs; /* 020 */ inputadapter_input = inputs[0]; /* 021 */ project_result = new UnsafeRow(1); /* 022 */ project_holder = new org.apache.spark.sql.catalyst.expressions.codegen.BufferHolder(project_result, 0); /* 023 */ project_rowWriter = new org.apache.spark.sql.catalyst.expressions.codegen.UnsafeRowWriter(project_holder, 1); /* 024 */ /* 025 */ } /* 026 */ /* 027 */ protected void processNext() throws java.io.IOException { /* 028 */ while (inputadapter_input.hasNext() && !stopEarly()) { /* 029 */ InternalRow inputadapter_row = (InternalRow) inputadapter_input.next(); /* 030 */ project_rowWriter.write(0, 1); /* 031 */ append(project_result); /* 032 */ if (shouldStop()) return; /* 033 */ } /* 034 */ } /* 035 */ /* 036 */ } ```
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