planner: fix order by sub-query couldn't find outer correlated columns

[AilinKid]

Signed-off-by: ailinkid [email protected]

What problem does this PR solve?

Issue Number: close #26945

Problem Summary:

DROP TABLE IF EXISTS t1, t2;
CREATE TABLE t1 (a INT, b INT);
CREATE TABLE t2 (a INT, b INT);
INSERT INTO t1 VALUES (1, 1);
INSERT INTO t2 VALUES (1, 1);
SELECT one.a FROM t1 one ORDER BY (SELECT two.b FROM t2 two WHERE two.a = one.b);

What is changed and how it works?

fetch the correlated column in order-by subquery out to select fields, building it as an Auxiliary one, which will be stored as p.schema() (passing as outer schema when enter subquery) when we try to build order-by clause. Otherwise it couldn't find that correlated column.

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

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• winoros
• xuyifangreeneyes

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[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/7880379c3742230eeefd3e23ef23e514a6684b5e

[winoros]

Than main changes LGTM

[CLAassistant]

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1 out of 2 committers have signed the CLA.

✅ AilinKid
❌ arenatlx

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[AilinKid]

/run-unit-test

[AilinKid]

This PR has come problems with CLA since I migrate to new mbp recently with wrongly-set git configuration.
It's has redirected to #33640 @winoros @xuyifangreeneyes

[ti-chi-bot]

@AilinKid: PR needs rebase.

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