Kimahriman edited a comment on pull request #34294:
URL: https://github.com/apache/spark/pull/34294#issuecomment-949585166
Codegen example for `df.selectExpr("transform(i, (x, i) -> x + i)")`:
```
/* 038 */ if (!localtablescan_isNull_0) {
/* 039 */ final int project_numElements_0 =
localtablescan_value_0.numElements();
/* 040 */
/* 041 */ ArrayData project_arrayData_0 =
ArrayData.allocateArrayData(
/* 042 */ 4, project_numElements_0, " transform failed.");
/* 043 */
/* 044 */ for (int project_i_0 = 0; project_i_0 <
project_numElements_0; project_i_0++) {
/* 045 */ int lambda_x_6 =
localtablescan_value_0.getInt(project_i_0);
/* 046 */ boolean lambda_x_6_isNull =
localtablescan_value_0.isNullAt(project_i_0);
/* 047 */ ((java.util.concurrent.atomic.AtomicReference)
references[1] /* x_6 */).set(lambda_x_6);
/* 048 */
/* 049 */ int lambda_i_7 = project_i_0;
/* 050 */ ((java.util.concurrent.atomic.AtomicReference)
references[2] /* i_7 */).set(lambda_i_7);
/* 051 */
/* 052 */ boolean project_isNull_3 = true;
/* 053 */ int project_value_3 = -1;
/* 054 */
/* 055 */ if (!lambda_x_6_isNull) {
/* 056 */ project_isNull_3 = false; // resultCode could change
nullability.
/* 057 */
/* 058 */ project_value_3 = lambda_x_6 + lambda_i_7;
/* 059 */
/* 060 */ }
/* 061 */ boolean project_isNull_2 = project_isNull_3;
/* 062 */ int project_value_2 = project_value_3;
/* 063 */
/* 064 */ if (project_isNull_2) {
/* 065 */ project_arrayData_0.setNullAt(project_i_0);
/* 066 */ } else {
/* 067 */ project_arrayData_0.setInt(project_i_0,
project_value_2);
/* 068 */ }
/* 069 */
/* 070 */ }
/* 071 */ project_value_0 = project_arrayData_0;
/* 072 */
/* 073 */ }
```
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