*: fix copr push down test (tidb#36415)

[solotzg]

Wait for tidb#36415
Verified in https://ci.pingcap.net/blue/organizations/jenkins/tidb_ghpr_integration_copr_test/detail/tidb_ghpr_integration_copr_test/9781/pipeline/88

Minimal reproduce step

drop table if exists cop_test;

create table cop_test (
    `col_year` year(4),
    `col_varbinary_32` varbinary(32)
) DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;

insert into cop_test values(NULL, '0'), (0000, NULL), (2004, NULL), (NULL, 'cbuxpgpjkkrzbrmcqhkctuhuzdvqqirt'), 
(2004, 'kcjvgqaoeycfzskxnknyyqdjlcbuxpgp'), (2014, '0'), (2008, '-1331298304'), (2007, '707461120'), (0000, '59506688');

SELECT ( 0 >> `col_year` ) * `col_varbinary_32` as f1 FROM cop_test order by f1 limit 7;

What did you expect to see?

MySQL

mysql> SELECT ( 0 >> `col_year` ) * `col_varbinary_32` as f1 FROM cop_test order by f1;
+------+
| f1   |
+------+
| NULL |
| NULL |
| NULL |
| NULL |
|    0 |
|    0 |
|   -0 |
|    0 |
|    0 |
+------+

mysql> SELECT ( 0 >> `col_year` ) * `col_varbinary_32` as f1 FROM cop_test order by f1 limit 7;
+------+
| f1   |
+------+
| NULL |
| NULL |
| NULL |
| NULL |
|    0 |
|    0 |
|   -0 |
+------+

What did you see instead

TiKV return unstable sort result when using LIMIT()

MySQL [test]> SELECT ( 0 >> `col_year` ) * `col_varbinary_32` as f1 FROM cop_test order by f1;
+------+
| f1   |
+------+
| NULL |
| NULL |
| NULL |
| NULL |
|    0 |
|    0 |
|   -0 |
|    0 |
|    0 |
+------+

MySQL [test]> explain SELECT ( 0 >> `col_year` ) * `col_varbinary_32` as f1 FROM cop_test order by f1 limit 7;
+----------------------------------+---------+-----------+----------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| id                               | estRows | task      | access object  | operator info                                                                                                                                                                                   |
+----------------------------------+---------+-----------+----------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Projection_6                     | 7.00    | root      |                | mul(cast(rightshift(0, test.cop_test.col_year), double UNSIGNED BINARY), cast(test.cop_test.col_varbinary_32, double BINARY))->Column#4                                                         |
| └─Projection_13                  | 7.00    | root      |                | test.cop_test.col_year, test.cop_test.col_varbinary_32                                                                                                                                          |
|   └─TopN_7                       | 7.00    | root      |                | Column#5, offset:0, count:7                                                                                                                                                                     |
|     └─Projection_14              | 7.00    | root      |                | test.cop_test.col_year, test.cop_test.col_varbinary_32, mul(cast(rightshift(0, test.cop_test.col_year), double UNSIGNED BINARY), cast(test.cop_test.col_varbinary_32, double BINARY))->Column#5 |
|       └─TableReader_12           | 7.00    | root      |                | data:TopN_11                                                                                                                                                                                    |
|         └─TopN_11                | 7.00    | cop[tikv] |                | mul(cast(rightshift(0, test.cop_test.col_year), double UNSIGNED BINARY), cast(test.cop_test.col_varbinary_32, double BINARY)), offset:0, count:7                                                |
|           └─TableFullScan_10     | 9.00    | cop[tikv] | table:cop_test | keep order:false, stats:pseudo                                                                                                                                                                  |
+----------------------------------+---------+-----------+----------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

MySQL [test]> SELECT ( 0 >> `col_year` ) * `col_varbinary_32` as f1 FROM cop_test order by f1 limit 7;
+------+
| f1   |
+------+
| NULL |
| NULL |
| NULL |
| NULL |
|    0 |
|   -0 |
|    0 |
+------+

MySQL [test]> explain analyze SELECT ( 0 >> `col_year` ) * `col_varbinary_32` as f1 FROM cop_test order by f1 limit 7;
+----------------------------------+---------+---------+-----------+----------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------+------+
| id                               | estRows | actRows | task      | access object  | execution info                                                                                                                                                                           | operator info                                                                                                                                                                                   | memory     | disk |
+----------------------------------+---------+---------+-----------+----------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------+------+
| Projection_6                     | 7.00    | 7       | root      |                | time:1.05ms, loops:2, Concurrency:OFF                                                                                                                                                    | mul(cast(rightshift(0, test.cop_test.col_year), double UNSIGNED BINARY), cast(test.cop_test.col_varbinary_32, double BINARY))->Column#4                                                         | 1016 Bytes | N/A  |
| └─Projection_13                  | 7.00    | 7       | root      |                | time:1.01ms, loops:2, Concurrency:OFF                                                                                                                                                    | test.cop_test.col_year, test.cop_test.col_varbinary_32                                                                                                                                          | 1.36 KB    | N/A  |
|   └─TopN_7                       | 7.00    | 7       | root      |                | time:1ms, loops:2                                                                                                                                                                        | Column#5, offset:0, count:7                                                                                                                                                                     | 867 Bytes  | N/A  |
|     └─Projection_14              | 7.00    | 7       | root      |                | time:986.5µs, loops:2, Concurrency:OFF                                                                                                                                                   | test.cop_test.col_year, test.cop_test.col_varbinary_32, mul(cast(rightshift(0, test.cop_test.col_year), double UNSIGNED BINARY), cast(test.cop_test.col_varbinary_32, double BINARY))->Column#5 | 1016 Bytes | N/A  |
|       └─TableReader_12           | 7.00    | 7       | root      |                | time:906.3µs, loops:2, cop_task: {num: 1, max: 821.7µs, proc_keys: 9, rpc_num: 1, rpc_time: 784.1µs, copr_cache_hit_ratio: 0.00, distsql_concurrency: 15}                                | data:TopN_11                                                                                                                                                                                    | 670 Bytes  | N/A  |
|         └─TopN_11                | 7.00    | 7       | cop[tikv] |                | tikv_task:{time:0s, loops:1}, scan_detail: {total_process_keys: 9, total_process_keys_size: 445, total_keys: 10, get_snapshot_time: 38.9µs, rocksdb: {key_skipped_count: 9, block: {}}}  | mul(cast(rightshift(0, test.cop_test.col_year), double UNSIGNED BINARY), cast(test.cop_test.col_varbinary_32, double BINARY)), offset:0, count:7                                                | N/A        | N/A  |
|           └─TableFullScan_10     | 9.00    | 9       | cop[tikv] | table:cop_test | tikv_task:{time:0s, loops:1}                                                                                                                                                             | keep order:false, stats:pseudo                                                                                                                                                                  | N/A        | N/A  |
+----------------------------------+---------+---------+-----------+----------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------+------+

Use unistore

use unistore and get current result

MySQL [test]> SELECT ( 0 >> `col_year` ) * `col_varbinary_32` as f1 FROM cop_test order by f1 limit 7;
+------+
| f1   |
+------+
| NULL |
| NULL |
| NULL |
| NULL |
|    0 |
|    0 |
|   -0 |
+------+

[solotzg]

/run-all-tests

[zanmato1984]

Need to cherry-pick to release-6.2, which doesn't exist yet. @solotzg