mchades commented on code in PR #12626:
URL: https://github.com/apache/gravitino/pull/12626#discussion_r4123049811


##########
server/src/main/java/org/apache/gravitino/server/web/rest/SemanticModelOperations.java:
##########
@@ -63,6 +72,44 @@ public SemanticModelOperations(SemanticModelDispatcher 
dispatcher) {
     this.dispatcher = dispatcher;
   }
 
+  /**
+   * Lists Semantic Models in a schema.
+   *
+   * @param metalake The metalake name.
+   * @param catalog The catalog name.
+   * @param schema The schema name.
+   * @return A response containing Semantic Model identifiers.
+   */
+  @GET
+  @Produces("application/vnd.gravitino.v1+json")
+  @Timed(name = "list-semantic-model." + MetricNames.HTTP_PROCESS_DURATION, 
absolute = true)
+  @ResponseMetered(name = "list-semantic-model", absolute = true)
+  public Response listSemanticModels(
+      @PathParam("metalake") String metalake,
+      @PathParam("catalog") String catalog,
+      @PathParam("schema") String schema) {
+    LOG.info(
+        "Received list Semantic Models request for schema: {}.{}.{}", 
metalake, catalog, schema);
+    try {
+      return Utils.doAs(
+          httpRequest,
+          () -> {
+            Namespace namespace = NamespaceUtil.ofSemanticModel(metalake, 
catalog, schema);
+            NameIdentifier[] identifiers = 
dispatcher.listSemanticModels(namespace);
+            identifiers = identifiers == null ? new NameIdentifier[0] : 
identifiers;

Review Comment:
   Authorization filtering is outside the scope of this PR and is tracked in 
#12594. After incorporating this PR, #13512 will add the schema-level list 
check and filter the returned identifiers with 
`FILTER_SEMANTIC_MODEL_AUTHORIZATION_EXPRESSION`.



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