pvary commented on code in PR #15776:
URL: https://github.com/apache/iceberg/pull/15776#discussion_r3195650450
##########
orc/src/main/java/org/apache/iceberg/orc/OrcValueReaders.java:
##########
@@ -163,6 +177,122 @@ protected StructReader(
}
}
+ protected StructReader(
+ TypeDescription orcType,
+ List<OrcValueReader<?>> readers,
+ Types.StructType struct,
+ Map<Integer, ?> idToConstant) {
+ List<Types.NestedField> fields = struct.fields();
+ this.readers = new OrcValueReader[fields.size()];
+ this.isConstantOrMetadataField = new boolean[fields.size()];
+ this.fieldVectorIndex = new int[fields.size()];
+
+ Map<Integer, OrcValueReader<?>> readersById = readersByFieldId(orcType,
readers);
+ Map<Integer, Integer> fieldIdToDataIndex =
buildFieldIdToVectorIndex(orcType);
+
+ for (int pos = 0; pos < fields.size(); pos += 1) {
+ Types.NestedField field = fields.get(pos);
+ OrcValueReader<?> fileReader = readersById.get(field.fieldId());
+ int dataIndex = fieldIdToDataIndex.getOrDefault(field.fieldId(), -1);
+
+ if (field.equals(MetadataColumns.ROW_ID)) {
+ handleRowIdField(pos, field, fileReader, idToConstant, dataIndex);
+ } else if (field.equals(MetadataColumns.LAST_UPDATED_SEQUENCE_NUMBER))
{
+ handleLastUpdatedSeqField(pos, field, fileReader, idToConstant,
dataIndex);
+ } else if (idToConstant.containsKey(field.fieldId())) {
+ this.isConstantOrMetadataField[pos] = true;
+ this.readers[pos] = constants(idToConstant.get(field.fieldId()));
+ } else if (field.equals(MetadataColumns.ROW_POSITION)) {
+ this.isConstantOrMetadataField[pos] = true;
+ this.readers[pos] = new RowPositionReader();
+ } else if (field.equals(MetadataColumns.IS_DELETED)) {
+ this.isConstantOrMetadataField[pos] = true;
+ this.readers[pos] = constants(false);
+ } else if (fileReader != null) {
+ this.isConstantOrMetadataField[pos] = false;
+ this.fieldVectorIndex[pos] =
fieldIdToDataIndex.getOrDefault(field.fieldId(), -1);
+ this.readers[pos] = fileReader;
+ } else if (MetadataColumns.isMetadataColumn(field.name())
+ || field.type().typeId() == Type.TypeID.UNKNOWN) {
+ this.isConstantOrMetadataField[pos] = true;
+ this.readers[pos] = constants(null);
+ } else {
+ throw new IllegalArgumentException(
+ String.format("Missing ORC reader for field %s (%s)",
field.name(), field.fieldId()));
+ }
+ }
+ }
+
+ private Map<Integer, Integer> buildFieldIdToVectorIndex(TypeDescription
orcType) {
+ List<TypeDescription> children = orcType.getChildren();
+ Map<Integer, Integer> mapping = Maps.newHashMap();
+ for (int i = 0; i < children.size(); i++) {
+ mapping.put(ORCSchemaUtil.fieldId(children.get(i)), i);
+ }
+
+ return mapping;
+ }
+
+ private Map<Integer, OrcValueReader<?>> readersByFieldId(
+ TypeDescription orcType, List<OrcValueReader<?>> readerList) {
+ List<TypeDescription> children = orcType.getChildren();
+ Preconditions.checkState(
+ children.size() == readerList.size(),
+ "Invalid ORC reader binding: children=%s readers=%s",
+ children.size(),
+ readerList.size());
+
+ Map<Integer, OrcValueReader<?>> readersById = Maps.newHashMap();
+ for (int i = 0; i < children.size(); i += 1) {
+ readersById.put(ORCSchemaUtil.fieldId(children.get(i)),
readerList.get(i));
+ }
+
+ return readersById;
+ }
+
+ @SuppressWarnings("unchecked")
+ private void handleRowIdField(
+ int pos,
+ Types.NestedField field,
+ OrcValueReader<?> fileReader,
+ Map<Integer, ?> idToConstant,
+ int dataIndex) {
Review Comment:
Maybe orcIndex?
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