nastra commented on code in PR #7913:
URL: https://github.com/apache/iceberg/pull/7913#discussion_r1358250961
##########
core/src/main/java/org/apache/iceberg/rest/CatalogHandlers.java:
##########
@@ -374,4 +385,107 @@ static TableMetadata commit(TableOperations ops,
UpdateTableRequest request) {
return ops.current();
}
+
+ public static BaseView baseView(View view) {
+ Preconditions.checkArgument(view instanceof BaseView, "View must be a
BaseView");
+ return (BaseView) view;
+ }
+
+ public static ListTablesResponse listViews(ViewCatalog catalog, Namespace
namespace) {
+ return
ListTablesResponse.builder().addAll(catalog.listViews(namespace)).build();
+ }
+
+ public static LoadViewResponse createView(
+ ViewCatalog catalog, Namespace namespace, CreateViewRequest request) {
+ request.validate();
+
+ ViewMetadata viewMetadata = request.metadata();
+ ViewBuilder viewBuilder =
+ catalog
+ .buildView(TableIdentifier.of(namespace, request.name()))
+ .withSchema(viewMetadata.schema())
+ .withProperties(viewMetadata.properties())
+
.withDefaultNamespace(viewMetadata.currentVersion().defaultNamespace())
+
.withDefaultCatalog(viewMetadata.currentVersion().defaultCatalog());
+ viewMetadata.currentVersion().representations().stream()
+ .filter(r -> r instanceof SQLViewRepresentation)
+ .map(r -> (SQLViewRepresentation) r)
+ .forEach(r -> viewBuilder.withQuery(r.dialect(), r.sql()));
+ View view = viewBuilder.create();
+
+ return viewResponse(view);
+ }
+
+ private static LoadViewResponse viewResponse(View view) {
+ ViewMetadata metadata = baseView(view).operations().current();
+ return ImmutableLoadViewResponse.builder()
+ .metadata(metadata)
+ .metadataLocation(metadata.metadataFileLocation())
+ .build();
+ }
+
+ public static LoadViewResponse loadView(ViewCatalog catalog, TableIdentifier
viewIdentifier) {
+ View view = catalog.loadView(viewIdentifier);
+ return viewResponse(view);
+ }
+
+ public static LoadViewResponse updateView(
+ ViewCatalog catalog, TableIdentifier ident, UpdateTableRequest request) {
+ View view = catalog.loadView(ident);
+ ViewMetadata metadata = commit(baseView(view).operations(), request);
+
+ return ImmutableLoadViewResponse.builder()
+ .metadata(metadata)
+ .metadataLocation(metadata.metadataFileLocation())
+ .build();
+ }
+
+ public static void renameView(ViewCatalog catalog, RenameTableRequest
request) {
+ catalog.renameView(request.source(), request.destination());
+ }
+
+ public static void dropView(ViewCatalog catalog, TableIdentifier
viewIdentifier) {
+ boolean dropped = catalog.dropView(viewIdentifier);
+ if (!dropped) {
+ throw new NoSuchViewException("View does not exist: %s", viewIdentifier);
+ }
+ }
+
+ static ViewMetadata commit(ViewOperations ops, UpdateTableRequest request) {
+ AtomicBoolean isRetry = new AtomicBoolean(false);
+ try {
+ Tasks.foreach(ops)
+ .retry(COMMIT_NUM_RETRIES_DEFAULT)
+ .exponentialBackoff(
+ COMMIT_MIN_RETRY_WAIT_MS_DEFAULT,
+ COMMIT_MAX_RETRY_WAIT_MS_DEFAULT,
+ COMMIT_TOTAL_RETRY_TIME_MS_DEFAULT,
+ 2.0 /* exponential */)
+ .onlyRetryOn(CommitFailedException.class)
+ .run(
+ taskOps -> {
+ ViewMetadata base = isRetry.get() ? taskOps.refresh() :
taskOps.current();
+ isRetry.set(true);
+
+ // apply changes
+ ViewMetadata.Builder metadataBuilder =
ViewMetadata.buildFrom(base);
+ request.updates().forEach(update ->
update.applyTo(metadataBuilder));
Review Comment:
> 1.) For creating a view, there probably needs to be a requirement similar
to table's AssertTableDoesNotExist but for views, AssertViewDoesNotExist.
Similar principle for ReplaceView and verifying the UUID as expected.
For tables I believe `UpdateRequirement.AssertTableDoesNotExist` is mainly
used for transactional cases, whereas for views we don't have transaction
support. I think what would make sense is to have an assertion on the UUID of
the view.
> 2.) I don't see a metadata update for AddViewRepresentation but I'd
imagine that should validate that the SQL dialect does not already exist for
the specified version. I forgot where we landed on that discussion, We do want
to prevent that right?
We do have `MetadataUpdate.AddViewVersion` for this and we do validate now
that there's no duplicate dialect (which was fixed as part of #7880), so we
should be good here.
> 3.) A requirement for the schema ID to make sure that is unchanged from
the base metadata?
Typically this would be done via `UpdateRequirement.AssertCurrentSchemaID`
when there's a `MetadataUpdate.SetCurrentSchema` update, but for Views we don't
send a `MetadataUpdate.SetCurrentSchema`
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