[GitHub] [spark] cloud-fan commented on a diff in pull request #43152: [SPARK-45361][SQL][DOCS] Describe characters unescaping in string literals

["cloud-fan (via GitHub)" <gi...@apache.org>]

cloud-fan commented on code in PR #43152:
URL: https://github.com/apache/spark/pull/43152#discussion_r1339486747


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docs/sql-ref-literals.md:
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@@ -51,6 +51,20 @@ A string literal is used to specify a character string value.
 
     Case insensitive, indicates `RAW`. If a string literal starts with `r` prefix, neither special characters nor unicode characters are escaped by `\`.
 
+The following escape sequences are recognized in regular string literals (without the `r` prefix), and replaced according to the following rules:
+- `\0` -> `\u0000`, unicode character with the code 0;
+- `\'` -> `'`, skip the slash before `'`;
+- `\"` -> `"`, skip the slash before `"`;

Review Comment:
   How is this different from ``` `\<other char>` -> `<other char>` ```? I think the key difference is, here the escaping happens, while `\<other char>` is kind of a fallback for invalid escaping. Shall we make this clearer?



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