junjunjd commented on code in PR #7901:
URL: https://github.com/apache/arrow-datafusion/pull/7901#discussion_r1379681340
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datafusion/common/src/scalar.rs:
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@@ -579,24 +581,44 @@ fn dict_from_values<K: ArrowDictionaryKeyType>(
macro_rules! typed_cast_tz {
($array:expr, $index:expr, $ARRAYTYPE:ident, $SCALAR:ident, $TZ:expr) => {{
- let array = $array.as_any().downcast_ref::<$ARRAYTYPE>().unwrap();
Review Comment:
typed_cast_tz macro is called by
[try_from_array](https://github.com/apache/arrow-datafusion/blob/main/datafusion/common/src/scalar.rs#L2021-L2022).
try_from_array is a public function. Depending on what array value the user
passes to the function, downcasting the array to a timestamp array can fail.
This error is reachable and recoverable. It makes sense to return an
internal error here. This aligns with how downcast error is handled in the
[downcast_value](https://github.com/apache/arrow-datafusion/blob/main/datafusion/common/src/lib.rs#L73)
macro.
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