Consolidate csv_opener.rs and json_opener.rs into a single example (#…

[cj-zhukov]

…13955)

Which issue does this PR close?

Closes #13955.

Rationale for this change

What changes are included in this PR?

Are these changes tested?

Are there any user-facing changes?

[alamb]

thank you @cj-zhukov -- very nice 🙏

This looks like a step forward to me and is much better than what is on main.

I left some comment suggestions, but I don't think they are needed prior to merge -- we could do them as a follow on PR too

[cj-zhukov]

@alamb Andrew, these are good comment suggestions. Let's add them as well.

[cj-zhukov]

@alamb Andrew, I've noticed some checks have failed. Could you help me understand if this is related to my changes or something else? I'd be happy to address the issue.

[alamb]

@alamb Andrew, I've noticed some checks have failed. Could you help me understand if this is related to my changes or something else? I'd be happy to address the issue.

Hi @cj-zhukov

• https://github.com/apache/datafusion/actions/runs/12583047937/job/35070117839?pr=13981 seems to be related to prettier not being run

The output says what to do to fix the issue

Run # if you encounter error, rerun the command below and commit the changes
  # if you encounter error, rerun the command below and commit the changes
  #
  # ignore subproject CHANGELOG.md because they are machine generated
  npx prettier@[2](https://github.com/apache/datafusion/actions/runs/12583047937/job/35070117839?pr=13981#step:4:2).7.1 --write \
    '{datafusion,datafusion-cli,datafusion-examples,dev,docs}/**/*.md' \
    '!datafusion/CHANGELOG.md' \
    README.md \
    CONTRIBUTING.md
  git diff --exit-code
  shell: /usr/bin/bash -e {0}

Likewise the cargo fmt issue is related: https://github.com/apache/datafusion/actions/runs/12583047930/job/35070118199?pr=13981

I think you can fix it by running cargo fmt locally and checking in the result

for https://github.com/apache/arrow-rs/actions/runs/12603098777/job/35127463640?pr=6936 that does not look related to your chages. Perhaps you can merge up from main and see if they are fixed:

git fetch origin
git merge origin/main
git push