szehon-ho commented on code in PR #9662:
URL: https://github.com/apache/iceberg/pull/9662#discussion_r1505175057
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api/src/main/java/org/apache/iceberg/StructTransform.java:
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@@ -51,11 +53,16 @@ class StructTransform implements StructLike, Serializable {
this.transforms = new SerializableFunction[size];
for (int i = 0; i < size; ++i) {
- int sourceFieldId = fieldTransforms.get(i).sourceFieldId();
+ int[] sourceFieldIds = fieldTransforms.get(i).sourceFieldIds();
Transform<?, ?> transform = fieldTransforms.get(i).transform();
- Accessor<StructLike> accessor = schema.accessorForField(sourceFieldId);
+ Accessor<StructLike> accessor = schema.accessorForFields(sourceFieldIds);
Review Comment:
Early question, can we have an array of accessors here? So this.accessors
becomes an array of array, or array of lists.
My thought is, then we can re-use schema.accessorForField() which has some
advantages like caching, and may be simpler than having to implement
schema.accessorForFields() and a 'structProjectionAccessor'?
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api/src/main/java/org/apache/iceberg/StructTransform.java:
##########
@@ -51,11 +53,16 @@ class StructTransform implements StructLike, Serializable {
this.transforms = new SerializableFunction[size];
for (int i = 0; i < size; ++i) {
- int sourceFieldId = fieldTransforms.get(i).sourceFieldId();
+ int[] sourceFieldIds = fieldTransforms.get(i).sourceFieldIds();
Transform<?, ?> transform = fieldTransforms.get(i).transform();
- Accessor<StructLike> accessor = schema.accessorForField(sourceFieldId);
+ Accessor<StructLike> accessor = schema.accessorForFields(sourceFieldIds);
+ String sourceFieldsDesc =
+ Arrays.stream(sourceFieldIds)
+ .mapToObj(schema::findField)
+ .map(Types.NestedField::name)
Review Comment:
NestedField already has string, is it necessary to map the name?
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