[GitHub] [arrow-rs] alamb commented on a change in pull request #1084: support cast decimal to decimal

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

alamb commented on a change in pull request #1084:
URL: https://github.com/apache/arrow-rs/pull/1084#discussion_r774073239



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File path: arrow/src/compute/kernels/cast.rs
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@@ -1908,6 +1945,14 @@ mod tests {
     use crate::{buffer::Buffer, util::display::array_value_to_string};
     use num::traits::Pow;
 
+    #[test]
+    fn test_cast_decimal_to_decimal() {
+        let input_type = DataType::Decimal(20, 3);
+        let output_type = DataType::Decimal(20, 4);
+        assert!(can_cast_types(&input_type, &output_type));
+        // let array = vec![Some(1123456), Some(2123456), Some(3123456), None];

Review comment:
       looks like we just need some tests here, and we'll be all set 👍 




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