stevenzwu commented on code in PR #11775:
URL: https://github.com/apache/iceberg/pull/11775#discussion_r2155141450


##########
api/src/main/java/org/apache/iceberg/expressions/Literals.java:
##########
@@ -300,8 +300,7 @@ public <T> Literal<T> to(Type type) {
         case TIMESTAMP:
           return (Literal<T>) new TimestampLiteral(value());
         case TIMESTAMP_NANO:
-          // assume micros and convert to nanos to match the behavior in the 
timestamp case above
-          return new TimestampLiteral(value()).to(type);
+          return (Literal<T>) new TimestampNanoLiteral(value());

Review Comment:
   I like Russel's suggestion of converting overflow error to an exception with 
clear error message. For nano timestamp, users just have to use string literal 
for now.
   
   Maybe in a separate effort, we can think about how to expose 
`TimestampLiteral` and `TimestampNanoLiteral` to clients/engines. that is when 
these use cases can be supported.
   ```
   ts < timestamp_micros(1230219000123123)
   ts < timestamp_millis(1230219000123123)
   ```



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