pvary commented on code in PR #15776:
URL: https://github.com/apache/iceberg/pull/15776#discussion_r3195663443
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orc/src/main/java/org/apache/iceberg/orc/OrcValueReaders.java:
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@@ -135,12 +138,24 @@ public byte[] nonNullRead(ColumnVector vector, int row) {
public abstract static class StructReader<T> implements OrcValueReader<T> {
private final OrcValueReader<?>[] readers;
private final boolean[] isConstantOrMetadataField;
-
+ private final int[] fieldVectorIndex;
+
+ /**
+ * @param readers readers for each field
+ * @param struct struct type
+ * @param idToConstant constant values by field id
+ * @deprecated Use {@link #StructReader(TypeDescription, List,
Types.StructType, Map)} instead.
+ * This constructor uses position-based binding which may cause field
misalignment in MOR
+ * scenarios. This doesn't work lineage scenarios.
+ */
+ @Deprecated
protected StructReader(
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 = null;
Review Comment:
Maybe add a short comment to describe what is stored here
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