executor: fix show database like case sensitive issue#34766

[e1ijah1]

Signed-off-by: elijah f1renze.142857@gmail.com

What problem does this PR solve?

Issue Number: close #34766

Problem Summary: show database like should not be case sensitive

What is changed and how it works?

add a filter plannercore.ShowDatabaseExtractor in the ShowExec. It will bring the like expression to the place where to get meta and filter them for getting the right result.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

MySQL root@(none):(none)> CREATE DATABASE `TEST_$1`;
Query OK, 1 row affected
Time: 0.002s
MySQL root@(none):(none)> CREATE DATABASE `test_$2`;
Query OK, 1 row affected
Time: 0.001s
MySQL root@(none):(none)> SHOW DATABASES LIKE "TEST_%";
+------------------+
| Database (TEST%) |
+------------------+
| TEST_$1          |
| test_$2          |
+------------------+

2 rows in set
Time: 0.014s
MySQL root@(none):(none)> SHOW DATABASES LIKE "test_%";
+------------------+
| Database (test%) |
+------------------+
| TEST_$1          |
| test_$2          |
+------------------+
2 rows in set
Time: 0.008s

• 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

Please refer to Release Notes Language Style Guide to write a quality release note.

executor: fix show database like case sensitive issue

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• hawkingrei
• xiongjiwei

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[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/79ff0d5a5f2e64de16899b729430a4b1b0fc70c6

[e1ijah1]

/run-mysql-test

[e1ijah1]

/run-check_title

[hawkingrei]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 96441d7

[hawkingrei]

/cherry-pick release-6.1

[hawkingrei]

/run-cherry-picker

[ti-srebot]

cherry pick to release-6.1 in PR #35060

[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/integration-ddl-test	🔴 all 6 tests passed	6 min 13 sec	Existing failure
idc-jenkins-ci/integration-cdc-test	✅ all 36 tests passed	33 min	Fixed
idc-jenkins-ci-tidb/integration-common-test	🟢 all 11 tests passed	13 min	Existing passed
idc-jenkins-ci-tidb/common-test	🟢 all 11 tests passed	7 min 54 sec	Existing passed
idc-jenkins-ci-tidb/sqllogic-test-2	🟢 all 28 tests passed	5 min 53 sec	Existing passed
idc-jenkins-ci-tidb/tics-test	🟢	25 sec	Existing passed
idc-jenkins-ci-tidb/sqllogic-test-1	🟢 all 13 tests passed	4 min 23 sec	Existing passed
idc-jenkins-ci-tidb/integration-compatibility-test	🟢 all 1 tests passed	2 min 45 sec	Existing passed
idc-jenkins-ci-tidb/mybatis-test	🟢 all 1 tests passed	3 min 5 sec	Existing passed
idc-jenkins-ci-tidb/plugin-test	🟢 build success, plugin test success	4min	Existing passed