5107ad3157
### What changes were proposed in this pull request?
Refine the SQL reference doc:
- remove useless subitems in the sidebar
- remove useless sub-menu-pages (e.g. `sql-ref-syntax-aux.md`)
- avoid using `#####` in `sql-ref-literals.md`
### Why are the changes needed?
The subitems in the sidebar are quite useless, as the menu page serves the same functionalities:
<img width="1040" alt="WX20210817-2358402x" src="https://user-images.githubusercontent.com/3182036/129765924-d7e69bc1-e351-4581-a6de-f2468022f372.png">
It's also extra work to keep the manu page and sidebar subitems in sync (The ANSI compliance page is already out of sync).
The sub-menu-pages are only referenced by the sidebar, and duplicates the content of the menu page. As a result, the `sql-ref-syntax-aux.md` is already outdated compared to the menu page. It's easier to just look at the menu page.
The `#####` is not rendered properly:
<img width="776" alt="WX20210818-0001192x" src="https://user-images.githubusercontent.com/3182036/129766760-6f385443-e597-44aa-888d-14d128d45f84.png">
It's better to avoid using it.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
N/A
Closes #33767 from cloud-fan/doc.
Authored-by: Wenchen Fan <wenchen@databricks.com>
Signed-off-by: Dongjoon Hyun <dhyun@apple.com>
(cherry picked from commit
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| menu-migration.yaml | ||
| menu-ml.yaml | ||
| menu-mllib.yaml | ||
| menu-sql.yaml | ||
