kbendick commented on a change in pull request #3701:
URL: https://github.com/apache/iceberg/pull/3701#discussion_r767080118
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File path:
spark/v3.2/spark/src/main/java/org/apache/iceberg/spark/SparkCatalog.java
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@@ -369,15 +370,53 @@ public void alterNamespace(String[] namespace,
NamespaceChange... changes) throw
}
@Override
+ // Spark assumes that catalogs CASCADE by default. So we have to eagerly
+ // attempt to drop namespaces and tables, but the CASCADE keyword is still
+ // required to actually drop tables and namespaces as Spark will error out
+ // if any of the recursive deletes are non-empty and the user didn't specify
+ // cascades in their query.
public boolean dropNamespace(String[] namespace) throws
NoSuchNamespaceException {
if (asNamespaceCatalog != null) {
+ Namespace asNamespace = Namespace.of(namespace);
+ boolean exists = namespaceExists(namespace);
+
+ // Spark only throws the catalyst version of `NoSuchNamespaceException`
if the namespace
+ // does not exist AND the user did not specify `IF EXISTS` in their
query.
+ //
+ // If the namespace does not exist, but listNamespaces didn't throw an
exception,
+ // we know the user used IF EXISTS and can return false early.
+ List<Namespace> subNamespaces;
try {
- return asNamespaceCatalog.dropNamespace(Namespace.of(namespace));
+ subNamespaces = asNamespaceCatalog.listNamespaces(asNamespace);
} catch (org.apache.iceberg.exceptions.NoSuchNamespaceException e) {
throw new NoSuchNamespaceException(namespace);
}
- }
+ if (!exists && subNamespaces.size() == 0) {
+ return false;
+ }
+
+ // Recursively drop namespaces under the requested `namespace`
+ // so that the base case will delete the tables and then the namespace
of those tables
+ // if the user used CASCADE. If the user did not use CASCADE, Spark will
return false
+ // as soon as it encounters a non-empty namespace.
+ for (Namespace ns : subNamespaces) {
+ try {
+ boolean didDrop = dropNamespace(ns.levels());
+ if (!didDrop) {
+ return false;
Review comment:
Basically, if this returns false, it means that the user called with `IF
EXISTS`. I have a few tests for it.
once it happens once, we know that they'll all be that way (because this is
the only circumstance that it will return false from instead of throwing - when
the user specified `IF EXISTS`).
I can remove the early return and allow it to iterate over all of them if
we'd like.
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