jackye1995 commented on a change in pull request #2465:
URL: https://github.com/apache/iceberg/pull/2465#discussion_r616244656
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File path: core/src/main/java/org/apache/iceberg/SchemaUpdate.java
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@@ -317,6 +333,38 @@ public UpdateSchema unionByNameWith(Schema newSchema) {
return this;
}
+ @Override
+ public UpdateSchema addIdentifierField(String name) {
+ Types.NestedField field = schema.findField(name);
+ if (field == null) {
+ field = adds.get(TABLE_ROOT_ID).stream()
+ .filter(f -> f.name().equals(name))
+ .findAny().orElse(null);
+ }
+
+ Preconditions.checkArgument(field != null,
+ "Cannot find column of the given name in existing or newly added
columns: %s", name);
+ Preconditions.checkArgument(field.isRequired(),
+ "Cannot add column %s as an identifier field because it is not a
required field", name);
Review comment:
Sounds good, I was trying to match the primary key spec in relational
SQL, but I agree that in our case of upsert null still makes sense. I will
update the logic.
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