chenkovsky commented on code in PR #16539:
URL: https://github.com/apache/datafusion/pull/16539#discussion_r2165155973


##########
datafusion/common/src/scalar/mod.rs:
##########
@@ -3069,7 +3069,7 @@ impl ScalarValue {
                 ScalarValue::Decimal128(Some(decimal_value), _, scale),
                 DataType::Timestamp(time_unit, None),
             ) => {
-                let scale_factor = 10_i128.pow(*scale as u32);
+                let scale_factor = 10_i128.pow(*scale as u32 + 3);

Review Comment:
   > I think the underlying arrow kernel may not support casting decimal --> 
timestamp (I bet this is something spark related) 🤔
   @alamb here implements casting decimal --> timestamp
   
https://github.com/apache/arrow-rs/blob/b6240b32e235d4ca330372e3be31f784ba133252/arrow-cast/src/cast/mod.rs#L4032



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