rdblue commented on code in PR #13039:
URL: https://github.com/apache/iceberg/pull/13039#discussion_r2241262894
##########
core/src/main/java/org/apache/iceberg/MetricsConfig.java:
##########
@@ -107,6 +115,81 @@ public static MetricsConfig forPositionDelete(Table table)
{
return new MetricsConfig(columnModes.build(), defaultMode);
}
+ static Iterable<Integer> breadthFirstFieldPriority(Schema schema) {
+ return TypeUtil.visit(
+ schema,
+ new TypeUtil.CustomOrderSchemaVisitor<>() {
+
+ @Override
+ public Iterable<Integer> schema(Schema schema,
Supplier<Iterable<Integer>> structResult) {
+ return structResult.get();
+ }
+
+ @Override
+ public Iterable<Integer> struct(
+ Types.StructType struct, Iterable<Iterable<Integer>>
fieldResults) {
+
+ List<Integer> orderedFieldIds =
+ Lists.newArrayListWithExpectedSize(struct.fields().size());
+ for (Types.NestedField field : struct.fields()) {
+ if (field.type().isPrimitiveType()) {
+ orderedFieldIds.add(field.fieldId());
+ }
+ }
+ return Iterables.concat(orderedFieldIds,
Iterables.concat(fieldResults));
+ }
+
+ @Override
+ public Iterable<Integer> field(
+ Types.NestedField field, Supplier<Iterable<Integer>> future) {
+ return future.get();
+ }
+
+ @Override
+ public Iterable<Integer> list(Types.ListType list,
Supplier<Iterable<Integer>> future) {
+ List<Integer> returnValue = Lists.newArrayListWithCapacity(1);
+ if (list.elementType().isPrimitiveType()) {
+ returnValue.add(list.elementId());
+ }
+ return Iterables.concat(returnValue, future.get());
+ }
+
+ @Override
+ public Iterable<Integer> map(
+ Types.MapType map,
+ Supplier<Iterable<Integer>> keyFuture,
+ Supplier<Iterable<Integer>> valueFuture) {
+ List<Integer> returnValue = Lists.newArrayListWithCapacity(2);
+ if (map.keyType().isPrimitiveType()) {
+ returnValue.add(map.keyId());
+ }
+ if (map.valueType().isPrimitiveType()) {
+ returnValue.add(map.valueId());
+ }
+
+ return Iterables.concat(returnValue, keyFuture.get(),
valueFuture.get());
+ }
+
+ @Override
+ public Iterable<Integer> variant(Types.VariantType variant) {
+ return Collections.emptyList();
+ }
+
+ @Override
+ public Iterable<Integer> primitive(Type.PrimitiveType primitive) {
+ return Collections.emptyList();
+ }
+ });
+ }
+
+ static Schema boundedBreadthFirstSubSchema(Schema schema, int
maxInferredDefaultColumns) {
Review Comment:
It's good to use breadth-first priority, but I don't think that the policy
needs to be exposed to the caller. How about renaming this something like
`limitFields`?
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