justinmclean opened a new issue, #9078:
URL: https://github.com/apache/gravitino/issues/9078
### What would you like to be improved?
Block non-cascading schema deletions when topics still exist by checking for
topic metadata and raising an NonEmptyEntityException.
Here is a unit test to help:
```
@Test
public void testDeleteSchemaFailsWhenTopicExists() throws IOException {
String metalakeName = "metalake";
AuditInfo auditInfo =
AuditInfo.builder().withCreator("creator").withCreateTime(Instant.now()).build();
BaseMetalake metalake =
createBaseMakeLake(RandomIdGenerator.INSTANCE.nextId(),
metalakeName, auditInfo);
backend.insert(metalake, false);
CatalogEntity catalog =
createCatalog(
RandomIdGenerator.INSTANCE.nextId(), Namespace.of(metalakeName),
"catalog", auditInfo);
backend.insert(catalog, false);
SchemaEntity schema =
createSchemaEntity(
RandomIdGenerator.INSTANCE.nextId(),
Namespace.of(metalakeName, "catalog"),
"schema",
auditInfo);
backend.insert(schema, false);
TopicEntity topic =
createTopicEntity(
RandomIdGenerator.INSTANCE.nextId(),
Namespace.of(metalakeName, "catalog", "schema"),
"topic",
auditInfo);
backend.insert(topic, false);
Assertions.assertThrows(
NonEmptyEntityException.class,
() ->
SchemaMetaService.getInstance().deleteSchema(schema.nameIdentifier(), false));
}
```
### How should we improve?
_No response_
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