[spark] branch branch-3.2 updated: [SPARK-34051][DOCS][FOLLOWUP] Document about unicode literals

[wenchen]

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The following commit(s) were added to refs/heads/branch-3.2 by this push:
     new 3bc9346  [SPARK-34051][DOCS][FOLLOWUP] Document about unicode literals
3bc9346 is described below

commit 3bc9346a3ade89ee3a8c584ee5ef679abd6d0898
Author: Kousuke Saruta <saru...@oss.nttdata.com>
AuthorDate: Tue Jul 20 16:58:12 2021 +0800

    [SPARK-34051][DOCS][FOLLOWUP] Document about unicode literals
    
    ### 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 <saru...@oss.nttdata.com>
    Signed-off-by: Wenchen Fan <wenc...@databricks.com>
    (cherry picked from commit ba1294ea5a25e908c19e3d4e73c6b7a420bb006e)
    Signed-off-by: Wenchen Fan <wenc...@databricks.com>
---
 docs/sql-ref-literals.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/docs/sql-ref-literals.md b/docs/sql-ref-literals.md
index 3dbed84..b23c63a 100644
--- a/docs/sql-ref-literals.md
+++ b/docs/sql-ref-literals.md
@@ -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
 

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