Github user davies commented on the pull request:
https://github.com/apache/spark/pull/11248#issuecomment-185885503
Here is part of the code generated from Q72
```
/* 160 */ private boolean findNextInnerJoinRows(
/* 161 */ scala.collection.Iterator leftIter,
/* 162 */ scala.collection.Iterator rightIter) {
/* 163 */ smj_leftRow = null;
/* 164 */ int comp = 0;
/* 165 */ while (smj_leftRow == null) {
/* 166 */ if (!leftIter.hasNext()) return false;
/* 167 */ smj_leftRow = (InternalRow) leftIter.next();
/* 168 */ /* input[7, int] */
/* 169 */ boolean smj_isNull = smj_leftRow.isNullAt(7);
/* 170 */ int smj_value = smj_isNull ? -1 : (smj_leftRow.getInt(7));
/* 171 */ if (smj_isNull) {
/* 172 */ smj_leftRow = null;
/* 173 */ continue;
/* 174 */ }
/* 175 */ if (!smj_matches.isEmpty()) {
/* 176 */ comp = 0;
/* 177 */ if (comp == 0) {
/* 178 */ comp = (smj_value > smj_value3 ? 1 : smj_value <
smj_value3 ? -1 : 0);
/* 179 */ }
/* 180 */
/* 181 */ if (comp == 0) {
/* 182 */ return true;
/* 183 */ }
/* 184 */ smj_matches.clear();
/* 185 */ }
/* 186 */
/* 187 */ do {
/* 188 */ if (smj_rightRow == null) {
/* 189 */ if (!rightIter.hasNext()) {
/* 190 */ smj_value3 = smj_value;
/* 191 */
/* 192 */ return !smj_matches.isEmpty();
/* 193 */ }
/* 194 */ smj_rightRow = (InternalRow) rightIter.next();
/* 195 */ /* input[1, int] */
/* 196 */ boolean smj_isNull1 = smj_rightRow.isNullAt(1);
/* 197 */ int smj_value1 = smj_isNull1 ? -1 :
(smj_rightRow.getInt(1));
/* 198 */ if (smj_isNull1) {
/* 199 */ smj_rightRow = null;
/* 200 */ continue;
/* 201 */ }
/* 202 */
/* 203 */ smj_value2 = smj_value1;
/* 204 */
/* 205 */ }
/* 206 */
/* 207 */ comp = 0;
/* 208 */ if (comp == 0) {
/* 209 */ comp = (smj_value > smj_value2 ? 1 : smj_value <
smj_value2 ? -1 : 0);
/* 210 */ }
/* 211 */
/* 212 */ if (comp > 0) {
/* 213 */ smj_rightRow = null;
/* 214 */ } else if (comp < 0) {
/* 215 */ if (!smj_matches.isEmpty()) {
/* 216 */ smj_value3 = smj_value;
/* 217 */
/* 218 */ return true;
/* 219 */ }
/* 220 */ smj_leftRow = null;
/* 221 */ } else {
/* 222 */ smj_matches.add(smj_rightRow.copy());
/* 223 */ smj_rightRow = null;;
/* 224 */ }
/* 225 */ } while (smj_leftRow != null);
/* 226 */ }
/* 227 */ return false; // unreachable
/* 228 */ }
/* 229 */
/* 230 */ protected void processNext() throws java.io.IOException {
/* 231 */ while (findNextInnerJoinRows(smj_leftInput, smj_rightInput)) {
/* 232 */ int smj_size = smj_matches.size();
/* 233 */ boolean smj_loaded = false;
/* 234 */
/* 235 */ smj_isNull7 = smj_leftRow.isNullAt(5);
/* 236 */ smj_value9 = smj_isNull7 ? -1 : (smj_leftRow.getInt(5));
/* 237 */
/* 238 */ for (int smj_i = 0; smj_i < smj_size; smj_i ++) {
/* 239 */ InternalRow smj_rightRow1 = (InternalRow)
smj_matches.get(smj_i);
/* 240 */ /* input[3, int] */
/* 241 */ boolean smj_isNull13 = smj_rightRow1.isNullAt(3);
/* 242 */ int smj_value15 = smj_isNull13 ? -1 :
(smj_rightRow1.getInt(3));
/* 243 */ /* (input[11, int] < input[5, int]) */
/* 244 */ boolean smj_isNull14 = true;
/* 245 */ boolean smj_value16 = false;
/* 246 */
/* 247 */ if (!smj_isNull13) {
/* 248 */ if (!smj_isNull7) {
/* 249 */ smj_isNull14 = false; // resultCode could change
nullability.
/* 250 */ smj_value16 = smj_value15 < smj_value9;
/* 251 */
/* 252 */ }
/* 253 */
/* 254 */ }
/* 255 */ if (smj_isNull14 || !smj_value16) continue;
/* 256 */ if (!smj_loaded) {
/* 257 */ smj_loaded = true;
/* 258 */
/* 259 */ smj_isNull2 = smj_leftRow.isNullAt(0);
/* 260 */ smj_value4 = smj_isNull2 ? -1 : (smj_leftRow.getInt(0));
/* 261 */
/* 262 */ smj_isNull3 = smj_leftRow.isNullAt(1);
/* 263 */ smj_value5 = smj_isNull3 ? -1 : (smj_leftRow.getInt(1));
/* 264 */
/* 265 */ smj_isNull4 = smj_leftRow.isNullAt(2);
/* 266 */ smj_value6 = smj_isNull4 ? -1 : (smj_leftRow.getInt(2));
/* 267 */
/* 268 */ smj_isNull5 = smj_leftRow.isNullAt(3);
/* 269 */ smj_value7 = smj_isNull5 ? -1 : (smj_leftRow.getInt(3));
/* 270 */
/* 271 */ smj_isNull6 = smj_leftRow.isNullAt(4);
/* 272 */ smj_value8 = smj_isNull6 ? -1 : (smj_leftRow.getInt(4));
/* 273 */
/* 274 */ smj_isNull8 = smj_leftRow.isNullAt(6);
/* 275 */ smj_value10 = smj_isNull8 ? -1 :
(smj_leftRow.getInt(6));
/* 276 */
/* 277 */ smj_isNull9 = smj_leftRow.isNullAt(7);
/* 278 */ smj_value11 = smj_isNull9 ? -1 :
(smj_leftRow.getInt(7));
/* 279 */
/* 280 */ }
/* 281 */ /* input[0, int] */
/* 282 */ boolean smj_isNull10 = smj_rightRow1.isNullAt(0);
/* 283 */ int smj_value12 = smj_isNull10 ? -1 :
(smj_rightRow1.getInt(0));
/* 284 */ /* input[1, int] */
/* 285 */ boolean smj_isNull11 = smj_rightRow1.isNullAt(1);
/* 286 */ int smj_value13 = smj_isNull11 ? -1 :
(smj_rightRow1.getInt(1));
/* 287 */ /* input[2, int] */
/* 288 */ boolean smj_isNull12 = smj_rightRow1.isNullAt(2);
/* 289 */ int smj_value14 = smj_isNull12 ? -1 :
(smj_rightRow1.getInt(2));
/* 290 */ smj_metricValue.add(1);
```
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