danielcweeks commented on code in PR #15283:
URL: https://github.com/apache/iceberg/pull/15283#discussion_r3074244549
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kafka-connect/kafka-connect/src/main/java/org/apache/iceberg/connect/data/RecordConverter.java:
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@@ -464,6 +479,222 @@ protected Temporal convertTimestampValue(Object value,
TimestampType type) {
return convertLocalDateTime(value);
}
+ protected Variant convertVariantValue(Object value) {
+ if (value instanceof ByteBuffer) {
+ return Variant.from((ByteBuffer) value);
+ }
+
+ Set<String> fieldNames = Sets.newHashSet();
+ collectFieldNames(value, fieldNames);
+ List<String> allFieldNames =
fieldNames.stream().sorted().collect(Collectors.toList());
+ VariantMetadata metadata = Variants.metadata(allFieldNames);
+ VariantValue variantValue = objectToVariantValue(value, metadata, null);
+ return Variant.of(metadata, variantValue);
+ }
+
+ /**
+ * Collects all field names (map keys) from the entire object tree into the
given set. Used to
+ * build a single VariantMetadata for the whole Variant (required for nested
maps).
+ */
+ private static void collectFieldNames(Object value, Set<String> names) {
+ if (value == null) {
+ return;
+ }
+ if (value instanceof Collection) {
+ for (Object element : (Collection<?>) value) {
+ collectFieldNames(element, names);
+ }
+ return;
+ }
+ if (value instanceof Map) {
+ Map<?, ?> map = (Map<?, ?>) value;
+ for (Map.Entry<?, ?> entry : map.entrySet()) {
+ Object key = entry.getKey();
+ if (key != null && key instanceof String) {
+ names.add((String) key);
+ collectFieldNames(entry.getValue(), names);
+ } else {
+ throw new IllegalArgumentException(
+ "Cannot convert map to variant: keys must be non-null strings,
was: "
+ + (key == null ? "null" : key.getClass().getName()));
+ }
+ }
+ return;
+ }
+ if (value instanceof Struct) {
+ Struct struct = (Struct) value;
+ for (Field field : struct.schema().fields()) {
+ names.add(field.name());
+ collectFieldNames(struct.get(field), names);
+ }
+ }
+ }
+
+ /**
+ * Recursively converts a Java object to a VariantValue using the given
shared metadata for all
+ * nested maps. Handles primitives, List (array), and Map (object); map keys
become field names.
+ */
+ private static VariantValue objectToVariantValue(
+ Object value, VariantMetadata metadata,
org.apache.kafka.connect.data.Schema schema) {
+ if (value == null) {
+ return Variants.ofNull();
+ }
+ VariantValue primitive = primitiveToVariantValue(value, schema);
+ if (primitive != null) {
+ return primitive;
+ }
+ if (value instanceof Collection) {
+ ValueArray array = Variants.array();
+ org.apache.kafka.connect.data.Schema elementSchema =
+ schema != null ? schema.valueSchema() : null;
+ for (Object element : (Collection<?>) value) {
+ array.add(objectToVariantValue(element, metadata, elementSchema));
+ }
+ return array;
+ }
+ if (value instanceof Map) {
+ return mapToVariantValue(value, metadata, schema);
+ }
+ if (value instanceof Struct) {
+ Struct struct = (Struct) value;
+ ShreddedObject object = Variants.object(metadata);
+ for (Field field : struct.schema().fields()) {
+ object.put(field.name(), objectToVariantValue(struct.get(field),
metadata, field.schema()));
+ }
+ return object;
+ }
+ throw new IllegalArgumentException("Cannot convert to variant: " +
value.getClass().getName());
+ }
+
+ private static VariantValue mapToVariantValue(
+ Object value, VariantMetadata metadata,
org.apache.kafka.connect.data.Schema schema) {
+ Map<?, ?> map = (Map<?, ?>) value;
+ ShreddedObject object = Variants.object(metadata);
+ org.apache.kafka.connect.data.Schema mapValueSchema =
+ schema != null ? schema.valueSchema() : null;
+ map.forEach(
+ (key, val) -> {
+ if (key != null && key instanceof String) {
Review Comment:
`key != null && ` redundant here as well
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