types: fix incompatible implementation of jsonpath extraction (#35320)

[ti-srebot]

cherry-pick #35320 to release-5.1
You can switch your code base to this Pull Request by using git-extras:

# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/35792

After apply modifications, you can push your change to this PR via:

git push [email protected]:ti-srebot/tidb.git pr/35792:release-5.1-ed5e63a7a0a2

---

What problem does this PR solve?

fix incompatible implementation of jsonpath extraction

Issue Number: close #30352

Problem Summary:

/* t */ drop table if exists t;
-- t >> 0 rows affected
/* t */ create table t (a varchar(100));
-- t >> 0 rows affected
/* t */ insert into t values ('{"labels":[{"name":"foo"}]}'),('{"labels":[{"name":"foo"},{"name":"bar"}]}');
-- t >> 2 rows affected
/* t */ select a->'$.labels[*].name' from t;

except:
-- t >> +-----------------------+
-- t    | a->'$.labels[*].name' |
-- t    +-----------------------+
-- t    | ["foo"]               |
-- t    | ["foo", "bar"]        |
-- t    +-----------------------+

actual:
-- t >> +-----------------------+
-- t    | a->'$.labels[*].name' |
-- t    +-----------------------+
-- t    | "foo"                 | <- not an array
-- t    | ["foo", "bar"]        |
-- t    +-----------------------+

What is changed and how it works?

Check List

Tests

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

None

[ti-chi-bot]

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[ti-srebot]

/run-all-tests

[ti-chi-bot]

@ti-srebot: This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick, it must first be approved by the collaborators.

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[ti-srebot]

@mengxin9014 you're already a collaborator in bot's repo.

[mengxin9014]

/close

[ti-chi-bot]

@mengxin9014: Closed this PR.

In response to this:

/close

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.