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[SPARK-34051][DOCS][FOLLOWUP] Document about unicode literals

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### What changes were proposed in this pull request?

This PR documents about unicode literals added in SPARK-34051 (#31096) and a past PR in `sql-ref-literals.md`.

### Why are the changes needed?

Notice users about the literals.

### Does this PR introduce _any_ user-facing change?

Yes, but just add a sentence.

### How was this patch tested?

Built the document and confirmed the result.
```
SKIP_API=1 bundle exec jekyll build
```
![unicode-literals](https://user-images.githubusercontent.com/4736016/126283923-944dc162-1817-47bc-a7e8-c3145225586b.png)

Closes #33434 from sarutak/unicode-literal-doc.

Authored-by: Kousuke Saruta <sarutak@oss.nttdata.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
This commit is contained in:
Kousuke Saruta 2021-07-20 16:58:12 +08:00 committed by Wenchen Fan
parent c77acf0bbc
commit ba1294ea5a
1 changed files with 2 additions and 0 deletions
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docs/sql-ref-literals.md
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@ -44,6 +44,8 @@ A string literal is used to specify a character string value.
* **char**
One character from the character set. Use `\` to escape special characters (e.g., `'` or `\`).
To represent unicode characters, use 16-bit or 32-bit unicode escape of the form `\uxxxx` or `\Uxxxxxxxx`,
where xxxx and xxxxxxxx are 16-bit and 32-bit code points in hexadecimal respectively (e.g., `\u3042` for `あ` and `\U0001F44D` for `👍`).
#### Examples