jbonofre commented on code in PR #12897:
URL: https://github.com/apache/iceberg/pull/12897#discussion_r2931251311
##########
api/src/main/java/org/apache/iceberg/PartitionField.java:
##########
@@ -19,26 +19,42 @@
package org.apache.iceberg;
import java.io.Serializable;
+import java.util.List;
import org.apache.iceberg.relocated.com.google.common.base.Objects;
+import org.apache.iceberg.relocated.com.google.common.collect.ImmutableList;
import org.apache.iceberg.transforms.Transform;
/** Represents a single field in a {@link PartitionSpec}. */
public class PartitionField implements Serializable {
- private final int sourceId;
+ private final List<Integer> sourceIds;
private final int fieldId;
private final String name;
private final Transform<?, ?> transform;
PartitionField(int sourceId, int fieldId, String name, Transform<?, ?>
transform) {
- this.sourceId = sourceId;
+ this(ImmutableList.of(sourceId), fieldId, name, transform);
+ }
+
+ PartitionField(List<Integer> sourceIds, int fieldId, String name,
Transform<?, ?> transform) {
+ this.sourceIds = ImmutableList.copyOf(sourceIds);
this.fieldId = fieldId;
this.name = name;
this.transform = transform;
}
/** Returns the field id of the source field in the {@link PartitionSpec
spec's} table schema. */
public int sourceId() {
- return sourceId;
+ return sourceIds.get(0);
Review Comment:
I added an accessor where I added a `Preconditions.checkState()`:
```
public int sourceId() {
Preconditions.checkState(
sourceIds.size() == 1,
"Use sourceIds() for multi-argument transforms, found %s source
ids",
sourceIds.size());
return sourceIds.get(0);
}
```
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