kumarUjjawal opened a new pull request, #22840:
URL: https://github.com/apache/datafusion/pull/22840
## Which issue does this PR close?
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- Closes #22818.
## Rationale for this change
DataFusion kept SQL dialect metadata in several separate places, which made
it easy for enum variants, canonical names, aliases, display names, docs, and
error messages to drift.
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## What changes are included in this PR?
- Centralize dialect metadata in one macro-driven source.
- Generate the `Dialect` enum, metadata table, canonical names, aliases,
display names, and available-dialect string from that source.
- Replace `Dialect::AVAILABLE` with `Dialect::available()`.
- Add `Dialect::metadata()` for iterating supported dialects.
- Update dialect error messages and generated config docs to use the
centralized metadata.
- Add an upgrade note for the removed public constant.
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## Are these changes tested?
Yes
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## Are there any user-facing changes?
Yes. `Dialect::AVAILABLE` is removed and replaced by `Dialect::available()`.
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