comphead commented on code in PR #12629:
URL: https://github.com/apache/datafusion/pull/12629#discussion_r1777275215


##########
datafusion/functions/src/string/common.rs:
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@@ -35,19 +35,26 @@ use datafusion_expr::ColumnarValue;
 
 /// Append a new view to the views buffer with the given substr
 ///
-/// raw must be a valid view
-/// substr must be a valid substring of raw
+/// # Safety
+/// original_view must be a valid view

Review Comment:
   what is valid view? 🤔 



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