session, table: fix listColumnPartition data race

[zimulala]

What problem does this PR solve?

Issue Number: close #33030

Problem Summary:
ForListColumnPruning has a lot of fields, if we use the lock to fix data race, it will make the code dirty.
So I change the way to fix #32416.

#32416 :
In step 1

In the bootstrap phase, new collation is true
After bootstrap ends, new collation is false.

In step 2

a. In the bootstrap phase, new collation is true. ForListColumnPruning builds the hashMap(generate the partition hash key, by calling EncodeKey) in TableFromMeta

b. After bootstrap ends, new collation is false. The generated partition hash key(by calling EncodeKey) could not be found in the hashMap.

What is changed and how it works?

This way I will rebuild hashMap with new collation is false after step 2.a. Then we can find the key in step 2.b.

Check List

Tests

• Unit test
  Tests already exist: TestLocatePartition

• Integration test

• Manual test (add detailed scripts or steps below)

1. Set the new_collations_enabled_on_first_bootstrap item to false and run the SQL statements as follows:

set @@session.tidb_enable_list_partition = ON;
set @@tidb_partition_prune_mode = 'dynamic';
drop table if exists github_events;
CREATE TABLE `github_events` (
`id` bigint(20) DEFAULT NULL,
`type` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci
PARTITION BY LIST COLUMNS(`type`)
(PARTITION `push_event` VALUES IN ("PushEvent"),
PARTITION `watch_event` VALUES IN ("WatchEvent")
);

2. Restart TiDB with new_collations_enabled_on_first_bootstrap = false and execute the following statements:

tidb> set @@session.tidb_enable_list_partition = ON;
Query OK, 0 rows affected (0.00 sec)

tidb> set @@tidb_partition_prune_mode = 'dynamic';
Query OK, 0 rows affected (0.00 sec)

tidb> desc select id,type from github_events  where  type = 'WatchEvent';
+-------------------------+----------+-----------+-----------------------+-------------------------------------------+
| id                      | estRows  | task      | access object         | operator info                             |
+-------------------------+----------+-----------+-----------------------+-------------------------------------------+
| TableReader_7           | 10.00    | root      | partition:watch_event | data:Selection_6                          |
| └─Selection_6           | 10.00    | cop[tikv] |                       | eq(test.github_events.type, "WatchEvent") |
|   └─TableFullScan_5     | 10000.00 | cop[tikv] | table:github_events   | keep order:false, stats:pseudo            |
+-------------------------+----------+-----------+-----------------------+-------------------------------------------+
3 rows in set (0.00 sec)

• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Fix the data race when using the list column partition.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• crazycs520
• wjhuang2016

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[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/42f067fb0572e433c18214768986639400fbc2d0

[zimulala]

/run-unit-test

[zimulala]

/run-unit-test

[zimulala]

/run-unit-test

[zimulala]

PTAL @wjhuang2016 @tiancaiamao @crazycs520

[tiancaiamao]

PTAL @wjhuang2016

[Defined2014]

/hold

[Defined2014]

@morgo @bb7133 @cfzjywxk
PTAL

[hawkingrei]

/unhold

[wjhuang2016]

/hold

[bb7133]

I don't think it's a good style, IMO a better way to do it is something like:

pt := t.(table.PartitionedTable); err != nil {
    panic(...)
}
pe, err := t.PartitionExpr()

Which is more clear. However, some extra changes are required and it might not be a good idea to make it in this PR.

[zimulala]

However, it is already confirmed that it is a partitioned table, so theoretically this(t.(partitionExpr)) should not report an error.

[zimulala]

PTAL @bb7133

[bb7133]

LGTM

[bb7133]

/merge

[zimulala]

/merge

[ti-srebot]

cherry pick to release-6.0 in PR #34285

[sre-bot]

TiDB MergeCI notify

✅ Well Done! New fixed [1] after this pr merged.

CI Name	Result	Duration	Compare with Parent commit
idc-jenkins-ci-tidb/common-test	🔴 failed 2, success 10, total 12	6 min 33 sec	Existing failure
idc-jenkins-ci-tidb/integration-compatibility-test	✅ all 1 tests passed	4 min 3 sec	Fixed
idc-jenkins-ci-tidb/integration-common-test	🟢 all 11 tests passed	18 min	Existing passed
idc-jenkins-ci-tidb/integration-ddl-test	🟢 all 6 tests passed	8 min 44 sec	Existing passed
idc-jenkins-ci-tidb/sqllogic-test-1	🟢 all 26 tests passed	6 min 46 sec	Existing passed
idc-jenkins-ci-tidb/sqllogic-test-2	🟢 all 28 tests passed	6 min 25 sec	Existing passed
idc-jenkins-ci-tidb/tics-test	🟢 all 1 tests passed	6 min 3 sec	Existing passed
idc-jenkins-ci-tidb/mybatis-test	🟢 all 1 tests passed	3 min 54 sec	Existing passed
idc-jenkins-ci-tidb/plugin-test	🟢 build success, plugin test success	4min	Existing passed