reslove the correlated agg func's correlated col when it in the sub-query

[AilinKid]

Signed-off-by: ailinkid [email protected]

What problem does this PR solve?

fix pingcap#30024: reslove the correlated agg func's correlated col when it in the sub-query

Reason: kind of name resolver problem, the agg inside sub-query is actually correlated with the outside group, so does the col name inside the agg func. this two expr should be built/kept in the outer schema, otherwise, when we are building having clause, the sub-query couldn't find the reference anywhere.

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation
• Need to update the tidb-ansible repository
• Need to be included in the release note