planner: select distinct should bypass batchget (#25477)

[ti-srebot]

cherry-pick #25477 to release-5.0
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/25533

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---

What problem does this PR solve?

Issue Number: close #25320

Problem Summary:

• Query with distinct gets wrong result

What is changed and how it works?

What's Changed:

• func tryWhereIn2BatchPointGet

How it Works:

• do not generate batchget plan if distinct is in the statement.

Check List

Tests

• Unit test

Side effects

• N/A

Release note

• planner: select distinct should bypass batchget

[ti-srebot]

/run-all-tests

[ti-srebot]

@qw4990 you're already a collaborator in bot's repo.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• winoros
• wjhuang2016

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[xiongjiwei]

/merge

[ti-chi-bot]

@xiongjiwei: /merge is only allowed for the committers, you can assign this pull request to the committer in list by filling /assign @committer in the comment to help merge this pull request.

In response to this:

/merge

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[zhuo-zhi]

/merge

[ti-chi-bot]

@zhuo-zhi: /merge is only allowed for the committers, you can assign this pull request to the committer in list by filling /assign @committer in the comment to help merge this pull request.

In response to this:

/merge

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[qw4990]

/merge

[ti-chi-bot]

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

Commit hash: 1265b35