mxm commented on code in PR #14728:
URL: https://github.com/apache/iceberg/pull/14728#discussion_r2588746794
##########
flink/v2.1/flink/src/main/java/org/apache/iceberg/flink/sink/dynamic/CompareSchemasVisitor.java:
##########
@@ -97,6 +101,11 @@ public Result struct(Types.StructType struct, Integer
tableSchemaId, List<Result
}
if (struct.fields().size() !=
tableSchemaType.asStructType().fields().size()) {
+ if (dropUnusedColumns
+ && struct.fields().size() <
tableSchemaType.asStructType().fields().size()) {
+ // We need to drop fields
+ return Result.SCHEMA_UPDATE_NEEDED;
Review Comment:
Here both blocks:
```java
for (Types.NestedField tableField :
tableSchemaType.asStructType().fields()) {
if (tableField.isRequired() && struct.field(tableField.name()) ==
null) {
// If a field from the table schema does not exist in the input
schema, then we won't visit
// it and check for required/optional compatibility. The only choice
is to make the table
// field optional.
return Result.SCHEMA_UPDATE_NEEDED;
}
}
if (struct.fields().size() !=
tableSchemaType.asStructType().fields().size()) {
if (dropUnusedColumns
&& struct.fields().size() <
tableSchemaType.asStructType().fields().size()) {
// We need to drop fields
return Result.SCHEMA_UPDATE_NEEDED;
}
return Result.DATA_CONVERSION_NEEDED;
}
```
This can probably be simplified to:
```java
for (Types.NestedField tableField :
tableSchemaType.asStructType().fields()) {
if (struct.field(tableField.name()) == null &&
(tableField.isRequired() || dropUnusedColumns)) {
// If a field from the table schema does not exist in the input
schema, then we won't visit
// it. The only choice is to make the table field optional or drop
it.
return Result.SCHEMA_UPDATE_NEEDED;
}
}
if (struct.fields().size() !=
tableSchemaType.asStructType().fields().size()) {
return Result.DATA_CONVERSION_NEEDED;
}
```
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