2010YOUY01 opened a new pull request, #7240:
URL: https://github.com/apache/arrow-datafusion/pull/7240
## Which issue does this PR close?
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## Rationale for this change
I've noticed it's easy to forget to add SQL reference documentation when
adding new functions.
Automate this task seems hard to do and maintain, so I think at least we can
remind contributors to do so somewhere in the src, function ENUM declaration
should be a good place for such README
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## What changes are included in this PR?
1. Update the contributor's guide for adding functions with `sqllogictest`
and SQL reference doc
2. Place the link close to the function ENUM declaration
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## Are these changes tested?
The doc has been built locally and all links have been tested
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## Are there any user-facing changes?
No
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