Update ResultType to Date

Author: artbcf

partitions.go

@@ -499,15 +499,6 @@ func (ps *PartitionSpec) PartitionType(schema *Schema) *StructType {
 			continue
 		}
 		resultType := field.Transform.ResultType(sourceType)
-		// DayTransform.ResultType returns Int32 (days since epoch), but the
-		// Avro encoding of a day-partition column must carry the "date" logical
-		// type so that Trino, Spark, and other engines can read manifests.
-		// Override to DateType here so downstream schema conversion picks it up
-		// automatically via the existing DateType branch, without coupling the
-		// Avro layer to transform internals.
-		if _, ok := field.Transform.(DayTransform); ok {
-			resultType = PrimitiveTypes.Date
-		}
 		nestedFields = append(nestedFields, NestedField{
 			ID:       field.FieldID,
 			Name:     field.Name,

transforms.go

@@ -789,7 +789,7 @@ func (t DayTransform) MarshalText() ([]byte, error) {
 func (DayTransform) String() string { return "day" }
 
 func (t DayTransform) CanTransform(sourceType Type) bool { return canTransformTime(t, sourceType) }
-func (DayTransform) ResultType(Type) Type                { return PrimitiveTypes.Int32 }
+func (DayTransform) ResultType(Type) Type                { return PrimitiveTypes.Date }
 func (DayTransform) PreservesOrder() bool                { return true }
 
 func (DayTransform) Equals(other Transform) bool {