[SPARK-16845][SQL][BRANCH-1.6] GeneratedClass$SpecificOrdering grows beyond 64 KB
#17158
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Prior to this patch, we'll generate `compare(...)` for `GeneratedClass$SpecificOrdering` like below, leading to Janino exceptions saying the code grows beyond 64 KB.
``` scala
/* 005 */ class SpecificOrdering extends o.a.s.sql.catalyst.expressions.codegen.BaseOrdering {
/* ..... */ ...
/* 10969 */ private int compare(InternalRow a, InternalRow b) {
/* 10970 */ InternalRow i = null; // Holds current row being evaluated.
/* 10971 */
/* 1.... */ code for comparing field0
/* 1.... */ code for comparing field1
/* 1.... */ ...
/* 1.... */ code for comparing field449
/* 15012 */
/* 15013 */ return 0;
/* 15014 */ }
/* 15015 */ }
```
This patch would break `compare(...)` into smaller `compare_xxx(...)` methods when necessary; then we'll get generated `compare(...)` like:
``` scala
/* 001 */ public SpecificOrdering generate(Object[] references) {
/* 002 */ return new SpecificOrdering(references);
/* 003 */ }
/* 004 */
/* 005 */ class SpecificOrdering extends o.a.s.sql.catalyst.expressions.codegen.BaseOrdering {
/* 006 */
/* 007 */ ...
/* 1.... */
/* 11290 */ private int compare_0(InternalRow a, InternalRow b) {
/* 11291 */ InternalRow i = null; // Holds current row being evaluated.
/* 11292 */
/* 11293 */ i = a;
/* 11294 */ boolean isNullA;
/* 11295 */ UTF8String primitiveA;
/* 11296 */ {
/* 11297 */
/* 11298 */ Object obj = ((Expression) references[0]).eval(null);
/* 11299 */ UTF8String value = (UTF8String) obj;
/* 11300 */ isNullA = false;
/* 11301 */ primitiveA = value;
/* 11302 */ }
/* 11303 */ i = b;
/* 11304 */ boolean isNullB;
/* 11305 */ UTF8String primitiveB;
/* 11306 */ {
/* 11307 */
/* 11308 */ Object obj = ((Expression) references[0]).eval(null);
/* 11309 */ UTF8String value = (UTF8String) obj;
/* 11310 */ isNullB = false;
/* 11311 */ primitiveB = value;
/* 11312 */ }
/* 11313 */ if (isNullA && isNullB) {
/* 11314 */ // Nothing
/* 11315 */ } else if (isNullA) {
/* 11316 */ return -1;
/* 11317 */ } else if (isNullB) {
/* 11318 */ return 1;
/* 11319 */ } else {
/* 11320 */ int comp = primitiveA.compare(primitiveB);
/* 11321 */ if (comp != 0) {
/* 11322 */ return comp;
/* 11323 */ }
/* 11324 */ }
/* 11325 */
/* 11326 */
/* 11327 */ i = a;
/* 11328 */ boolean isNullA1;
/* 11329 */ UTF8String primitiveA1;
/* 11330 */ {
/* 11331 */
/* 11332 */ Object obj1 = ((Expression) references[1]).eval(null);
/* 11333 */ UTF8String value1 = (UTF8String) obj1;
/* 11334 */ isNullA1 = false;
/* 11335 */ primitiveA1 = value1;
/* 11336 */ }
/* 11337 */ i = b;
/* 11338 */ boolean isNullB1;
/* 11339 */ UTF8String primitiveB1;
/* 11340 */ {
/* 11341 */
/* 11342 */ Object obj1 = ((Expression) references[1]).eval(null);
/* 11343 */ UTF8String value1 = (UTF8String) obj1;
/* 11344 */ isNullB1 = false;
/* 11345 */ primitiveB1 = value1;
/* 11346 */ }
/* 11347 */ if (isNullA1 && isNullB1) {
/* 11348 */ // Nothing
/* 11349 */ } else if (isNullA1) {
/* 11350 */ return -1;
/* 11351 */ } else if (isNullB1) {
/* 11352 */ return 1;
/* 11353 */ } else {
/* 11354 */ int comp = primitiveA1.compare(primitiveB1);
/* 11355 */ if (comp != 0) {
/* 11356 */ return comp;
/* 11357 */ }
/* 11358 */ }
/* 1.... */
/* 1.... */ ...
/* 1.... */
/* 12652 */ return 0;
/* 12653 */ }
/* 1.... */
/* 1.... */ ...
/* 15387 */
/* 15388 */ public int compare(InternalRow a, InternalRow b) {
/* 15389 */
/* 15390 */ int comp_0 = compare_0(a, b);
/* 15391 */ if (comp_0 != 0) {
/* 15392 */ return comp_0;
/* 15393 */ }
/* 15394 */
/* 15395 */ int comp_1 = compare_1(a, b);
/* 15396 */ if (comp_1 != 0) {
/* 15397 */ return comp_1;
/* 15398 */ }
/* 1.... */
/* 1.... */ ...
/* 1.... */
/* 15450 */ return 0;
/* 15451 */ }
/* 15452 */ }
```
- a new added test case which
- would fail prior to this patch
- would pass with this patch
- ordering correctness should already be covered by existing tests like those in `OrderingSuite`
A major part of this PR - the refactoring work of `splitExpression()` - has been done by ueshin.
Author: Liwei Lin <lwlin7@gmail.com>
Author: Takuya UESHIN <ueshin@happy-camper.st>
Author: Takuya Ueshin <ueshin@happy-camper.st>
Closes apache#15480 from lw-lin/spec-ordering-64k-.
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Test build #73886 has finished for PR 17158 at commit
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Jenkins, retest this please |
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Test build #73890 has finished for PR 17158 at commit
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thanks, merging to 1.6! |
zzcclp
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Mar 7, 2017
… beyond 64 KB ## What changes were proposed in this pull request? This is a backport pr of apache#15480 into `branch-1.6`. ## How was this patch tested? Existing tests. Author: Liwei Lin <lwlin7@gmail.com> Closes apache#17158 from ueshin/issues/SPARK-16845_1.6. (cherry picked from commit 23f9faa)
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What changes were proposed in this pull request?
This is a backport pr of #15480 into
branch-1.6.How was this patch tested?
Existing tests.