itsjunetime commented on code in PR #11958:
URL: https://github.com/apache/datafusion/pull/11958#discussion_r1714422662


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datafusion/functions/src/datetime/common.rs:
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@@ -227,46 +229,34 @@ where
         // if the first argument is a scalar utf8 all arguments are expected 
to be scalar utf8
         ColumnarValue::Scalar(scalar) => match scalar {
             ScalarValue::Utf8(a) | ScalarValue::LargeUtf8(a) => {
-                let mut val: Option<Result<ColumnarValue>> = None;
-                let mut err: Option<DataFusionError> = None;
+                let a = a.as_ref();
+                // ASK: Why do we trust `a` to be non-null at this point?

Review Comment:
   Previously, in this code path, if `a` was None, then the `err` that we 
unwrap later down in that same block would also be None, causing a more 
confusing error. So since we're comfortable unwrapping the err later on, we 
must be confident `a` is `Some(_)`.



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