aokolnychyi commented on a change in pull request #2257:
URL: https://github.com/apache/iceberg/pull/2257#discussion_r588765967
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File path: core/src/main/java/org/apache/iceberg/SchemaUpdate.java
##########
@@ -382,27 +378,43 @@ private int assignNewColumnId() {
}
private TableMetadata applyChangesToMapping(TableMetadata metadata) {
- String mappingJson =
metadata.property(TableProperties.DEFAULT_NAME_MAPPING, null);
- if (mappingJson != null) {
+ String existingMappingJson =
metadata.property(TableProperties.DEFAULT_NAME_MAPPING, null);
+ TableMetadata ret = metadata;
+ if (existingMappingJson != null) {
try {
// parse and update the mapping
- NameMapping mapping = NameMappingParser.fromJson(mappingJson);
+ NameMapping mapping = NameMappingParser.fromJson(existingMappingJson);
NameMapping updated = MappingUtil.update(mapping, updates, adds);
// replace the table property
Map<String, String> updatedProperties = Maps.newHashMap();
updatedProperties.putAll(metadata.properties());
updatedProperties.put(TableProperties.DEFAULT_NAME_MAPPING,
NameMappingParser.toJson(updated));
- return metadata.replaceProperties(updatedProperties);
+ ret = metadata.replaceProperties(updatedProperties);
} catch (RuntimeException e) {
// log the error, but do not fail the update
- LOG.warn("Failed to update external schema mapping: {}", mappingJson,
e);
+ LOG.warn("Failed to update external schema mapping: {}",
existingMappingJson, e);
}
}
- return metadata;
+ // Transform the metrics if they exist
+ if (base != null && base.properties() != null) {
+ Schema newSchema = metadata.schema();
+ List<String> deletedColumns = deletes.stream()
+ .map(i -> schema.findColumnName(i))
Review comment:
+1
We can even simplify it further, I guess:
```
deletes.stream()
.map(schema::findColumnName)
.collect(Collectors.toList());
```
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