[GitHub] [arrow-rs] alamb commented on a diff in pull request #1738: Support casting `Utf8` to `Boolean`

[GitBox <gi...@apache.org>]

alamb commented on code in PR #1738:
URL: https://github.com/apache/arrow-rs/pull/1738#discussion_r882041930


##########
arrow/src/compute/kernels/cast.rs:
##########
@@ -1661,6 +1660,34 @@ fn cast_string_to_timestamp_ns<Offset: OffsetSizeTrait>(
     Ok(Arc::new(array) as ArrayRef)
 }
 
+/// Casts Utf8 to Boolean
+fn cast_utf8_to_boolean(from: &ArrayRef, cast_options: &CastOptions) -> Result<ArrayRef> {
+    let array = from.as_any().downcast_ref::<StringArray>().unwrap();

Review Comment:
   You can also use `as_string_array()` function if you want to save some typing



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