GH-47481: [C++][Acero] record_batch_reader_source specify Ordering::Implicit to support select * limit k

[egolearner]

Rationale for this change

record_batch_reader_source does not support select * limit k as described in #47481

What changes are included in this PR?

record_batch_reader_source specify Ordering::Implicit

Are these changes tested?

yes

Are there any user-facing changes?

no

• GitHub Issue: [C++][Acero] record_batch_reader_source does not support select * limit 3 #47481

[github-actions]

Thanks for opening a pull request!

If this is not a minor PR. Could you open an issue for this pull request on GitHub? https://github.com/apache/arrow/issues/new/choose

Opening GitHub issues ahead of time contributes to the Openness of the Apache Arrow project.

Then could you also rename the pull request title in the following format?

GH-${GITHUB_ISSUE_ID}: [${COMPONENT}] ${SUMMARY}

or

MINOR: [${COMPONENT}] ${SUMMARY}

See also:

• Other pull requests
• Contribution Guidelines - Contributing Overview

[github-actions]

⚠️ GitHub issue #47481 has been automatically assigned in GitHub to PR creator.

[egolearner]

Hi @westonpace , please take a look

[egolearner]

Hi @westonpace , please take a look

[egolearner]

ping @westonpace