jackye1995 commented on a change in pull request #2556:
URL: https://github.com/apache/iceberg/pull/2556#discussion_r627885078
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File path: api/src/main/java/org/apache/iceberg/types/TypeUtil.java
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@@ -181,10 +183,24 @@ public static Schema assignFreshIds(int schemaId, Schema
schema, NextID nextId)
* @return a structurally identical schema with new ids assigned by the
nextId function
*/
public static Schema assignFreshIds(Schema schema, Schema baseSchema, NextID
nextId) {
- return new Schema(TypeUtil
- .visit(schema.asStruct(), new AssignFreshIds(schema, baseSchema,
nextId))
- .asNestedType()
- .fields());
+ Types.StructType freshSchemaStruct = TypeUtil
+ .visit(schema.asStruct(), new AssignFreshIds(schema, baseSchema,
nextId))
+ .asStructType();
+ return new Schema(freshSchemaStruct.fields(),
refreshIdentifierFields(freshSchemaStruct, schema));
+ }
+
+ /**
+ * Get the identifier fields in the fresh schema based on the identifier
fields in the base schema.
+ * @param freshSchema fresh schema
+ * @param baseSchema base schema
+ * @return idnetifier fields in the fresh schema
+ */
+ public static Set<Integer> refreshIdentifierFields(Types.StructType
freshSchema, Schema baseSchema) {
+ Map<String, Integer> nameToId = TypeUtil.indexByName(freshSchema);
+ return baseSchema.identifierFieldNames().stream()
+ .map(nameToId::get)
+ .filter(Objects::nonNull)
Review comment:
I chose that approach for use case like select, but later realized we
should not support that, so throwing exception does make more sense, will
update.
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