chore: cleanup exceptions thrown for timestamp unit

api/src/main/java/org/apache/iceberg/transforms/TransformUtil.java

@@ -63,7 +63,7 @@ public static String humanTimestamp(Types.TimestampType tsType, Long value) {
         case NANOS:
           return ChronoUnit.NANOS.addTo(EPOCH, value).toString();
         default:
-          throw new IllegalArgumentException("Invalid timestamp unit: " + tsType.unit());
+          throw new UnsupportedOperationException("Unsupported timestamp unit: " + tsType.unit());
       }
     } else {
       switch (tsType.unit()) {
@@ -72,7 +72,7 @@ public static String humanTimestamp(Types.TimestampType tsType, Long value) {
         case NANOS:
           return ChronoUnit.NANOS.addTo(EPOCH, value).toLocalDateTime().toString();
         default:
-          throw new IllegalArgumentException("Invalid timestamp unit: " + tsType.unit());
+          throw new UnsupportedOperationException("Unsupported timestamp unit: " + tsType.unit());
       }
     }
   }

orc/src/main/java/org/apache/iceberg/data/orc/GenericOrcWriter.java

@@ -104,7 +104,8 @@ public OrcValueWriter<?> primitive(Type.PrimitiveType iPrimitive, TypeDescriptio
                   ? GenericOrcWriters.timestampnsTz()
                   : GenericOrcWriters.timestampns();
             default:
-              throw new IllegalArgumentException("Invalid timestamp unit: " + timestampType.unit());
+              throw new UnsupportedOperationException(
+                  "Unsupported timestamp unit: " + timestampType.unit());
           }
         case STRING:
           return GenericOrcWriters.strings();

orc/src/main/java/org/apache/iceberg/orc/OrcToIcebergVisitor.java

@@ -186,7 +186,7 @@ public Optional<Types.NestedField> primitive(TypeDescription primitive) {
                     icebergID, isOptional, name, Types.TimestampType.nanosWithoutZone());
             break;
           default:
-            throw new IllegalStateException("Invalid Timestamp unit found in ORC type attribute");
+            throw new UnsupportedOperationException("Unsupported timestamp unit: " + unit);
         }
         break;
       case TIMESTAMP_INSTANT:

parquet/src/main/java/org/apache/iceberg/data/parquet/BaseParquetWriter.java

@@ -216,8 +216,8 @@ public Optional<ParquetValueWriters.PrimitiveWriter<?>> visit(
                   ? new TimestamptznsWriter(desc)
                   : new TimestampnsWriter(desc));
         default:
-          throw new IllegalArgumentException(
-              "Timestamp unit %s not supported" + timestampType.getUnit());
+          throw new UnsupportedOperationException(
+              "Unsupported timestamp unit" + timestampType.getUnit());
       }
     }
 

parquet/src/main/java/org/apache/iceberg/parquet/MessageTypeToType.java

@@ -228,7 +228,7 @@ public Optional<Type> visit(
                   : TimestampType.nanosWithoutZone());
         default:
           throw new UnsupportedOperationException(
-              "Cannot convert unsupported timestamp unit: " + timestampType.getUnit());
+              "Unsupported timestamp unit: " + timestampType.getUnit());
       }
     }