diff --git a/analytical_engine/core/grape_instance.cc b/analytical_engine/core/grape_instance.cc
index 0e1e1c5b5087..c39c03b39a09 100644
--- a/analytical_engine/core/grape_instance.cc
+++ b/analytical_engine/core/grape_instance.cc
@@ -318,12 +318,14 @@ bl::result<std::string> GrapeInstance::query(const rpc::GSParams& params,
                   app->Query(worker.get(), query_args, context_key, wrapper));
   std::string context_type;
   std::string context_schema;
-  if (ctx_wrapper != nullptr) {
+  if (ctx_wrapper == nullptr) {
+    RETURN_GS_ERROR(
+        vineyard::ErrorCode::kIllegalStateError,
+        "Query returns a null context wrapper without useful error message");
+  } else {
     context_type = ctx_wrapper->context_type();
     context_schema = ctx_wrapper->schema();
     BOOST_LEAF_CHECK(object_manager_.PutObject(ctx_wrapper));
-  } else {
-    LOG(ERROR) << "Error occur when querying";
   }
   return toJson({{"context_type", context_type},
                  {"context_key", context_key},
diff --git a/analytical_engine/frame/app_frame.cc b/analytical_engine/frame/app_frame.cc
index 14edae6db9f5..39bf7ccd975b 100644
--- a/analytical_engine/frame/app_frame.cc
+++ b/analytical_engine/frame/app_frame.cc
@@ -82,27 +82,25 @@ __attribute__((visibility("hidden"))) std::nullptr_t DeleteWorker(
   return nullptr;
 }
 
-__attribute__((visibility("hidden"))) std::nullptr_t Query(
+__attribute__((visibility("hidden"))) bl::result<std::nullptr_t> Query(
     void* worker_handler, const gs::rpc::QueryArgs& query_args,
     const std::string& context_key,
     std::shared_ptr<gs::IFragmentWrapper> frag_wrapper,
-    std::shared_ptr<gs::IContextWrapper>& ctx_wrapper,
-    bl::result<nullptr_t>& wrapper_error) {
+    std::shared_ptr<gs::IContextWrapper>& ctx_wrapper) {
   auto worker = static_cast<worker_handler_t*>(worker_handler)->worker;
   auto result = gs::AppInvoker<_APP_TYPE>::Query(worker, query_args);
-  if (!result) {
-    wrapper_error = std::move(result);
-    return nullptr;
+  if (result) {
+    if (!context_key.empty()) {
+      auto ctx = worker->GetContext();
+      ctx_wrapper = gs::CtxWrapperBuilder<typename _APP_TYPE::context_t>::build(
+          context_key, frag_wrapper, ctx);
+    }
   }
-
-  if (!context_key.empty()) {
-    auto ctx = worker->GetContext();
-    ctx_wrapper = gs::CtxWrapperBuilder<typename _APP_TYPE::context_t>::build(
-        context_key, frag_wrapper, ctx);
-  }
-  return nullptr;
+  return result;
 }
+
 }  // namespace detail
+
 extern "C" {
 void* CreateWorker(const std::shared_ptr<void>& fragment,
                    const grape::CommSpec& comm_spec,
@@ -125,6 +123,6 @@ void Query(void* worker_handler, const gs::rpc::QueryArgs& query_args,
            bl::result<nullptr_t>& wrapper_error) {
   __FRAME_CATCH_AND_ASSIGN_GS_ERROR(
       wrapper_error, detail::Query(worker_handler, query_args, context_key,
-                                   frag_wrapper, ctx_wrapper, wrapper_error));
+                                   frag_wrapper, ctx_wrapper));
 }
 }  // extern "C"
diff --git a/analytical_engine/frame/cython_app_frame.cc b/analytical_engine/frame/cython_app_frame.cc
index 71914faff1ea..bd9223b9c81c 100644
--- a/analytical_engine/frame/cython_app_frame.cc
+++ b/analytical_engine/frame/cython_app_frame.cc
@@ -173,25 +173,21 @@ __attribute__((visibility("hidden"))) std::nullptr_t DeleteWorker(
   return nullptr;
 }
 
-__attribute__((visibility("hidden"))) std::nullptr_t Query(
+__attribute__((visibility("hidden"))) bl::result<std::nullptr_t> Query(
     void* worker_handler, const gs::rpc::QueryArgs& query_args,
     const std::string& context_key,
     std::shared_ptr<gs::IFragmentWrapper> frag_wrapper,
-    std::shared_ptr<gs::IContextWrapper>& ctx_wrapper,
-    bl::result<nullptr_t>& wrapper_error) {
+    std::shared_ptr<gs::IContextWrapper>& ctx_wrapper) {
   auto worker = static_cast<worker_handler_t*>(worker_handler)->worker;
   auto result = gs::AppInvoker<_APP_TYPE>::Query(worker, query_args);
-  if (!result) {
-    wrapper_error = std::move(result);
-    return nullptr;
+  if (result) {
+    if (!context_key.empty()) {
+      auto ctx = worker->GetContext();
+      ctx_wrapper = gs::CtxWrapperBuilder<typename _APP_TYPE::context_t>::build(
+          context_key, frag_wrapper, ctx);
+    }
   }
-
-  if (!context_key.empty()) {
-    auto ctx = worker->GetContext();
-    ctx_wrapper = gs::CtxWrapperBuilder<typename _APP_TYPE::context_t>::build(
-        context_key, frag_wrapper, ctx);
-  }
-  return nullptr;
+  return result;
 }
 
 }  // namespace detail
@@ -218,6 +214,6 @@ void Query(void* worker_handler, const gs::rpc::QueryArgs& query_args,
            bl::result<nullptr_t>& wrapper_error) {
   __FRAME_CATCH_AND_ASSIGN_GS_ERROR(
       wrapper_error, detail::Query(worker_handler, query_args, context_key,
-                                   frag_wrapper, ctx_wrapper, wrapper_error));
+                                   frag_wrapper, ctx_wrapper));
 }
 }  // extern "C"
diff --git a/analytical_engine/frame/cython_pie_app_frame.cc b/analytical_engine/frame/cython_pie_app_frame.cc
index 2771d98eeff5..5da38b7764dd 100644
--- a/analytical_engine/frame/cython_pie_app_frame.cc
+++ b/analytical_engine/frame/cython_pie_app_frame.cc
@@ -161,25 +161,21 @@ __attribute__((visibility("hidden"))) std::nullptr_t DeleteWorker(
   return nullptr;
 }
 
-__attribute__((visibility("hidden"))) std::nullptr_t Query(
+__attribute__((visibility("hidden"))) bl::result<std::nullptr_t> Query(
     void* worker_handler, const gs::rpc::QueryArgs& query_args,
     const std::string& context_key,
     std::shared_ptr<gs::IFragmentWrapper> frag_wrapper,
-    std::shared_ptr<gs::IContextWrapper>& ctx_wrapper,
-    bl::result<nullptr_t>& wrapper_error) {
+    std::shared_ptr<gs::IContextWrapper>& ctx_wrapper) {
   auto worker = static_cast<worker_handler_t*>(worker_handler)->worker;
   auto result = gs::AppInvoker<_APP_TYPE>::Query(worker, query_args);
-  if (!result) {
-    wrapper_error = std::move(result);
-    return nullptr;
+  if (result) {
+    if (!context_key.empty()) {
+      auto ctx = worker->GetContext();
+      ctx_wrapper = gs::CtxWrapperBuilder<typename _APP_TYPE::context_t>::build(
+          context_key, frag_wrapper, ctx);
+    }
   }
-
-  if (!context_key.empty()) {
-    auto ctx = worker->GetContext();
-    ctx_wrapper = gs::CtxWrapperBuilder<typename _APP_TYPE::context_t>::build(
-        context_key, frag_wrapper, ctx);
-  }
-  return nullptr;
+  return result;
 }
 
 }  // namespace detail
@@ -206,7 +202,7 @@ void Query(void* worker_handler, const gs::rpc::QueryArgs& query_args,
            bl::result<nullptr_t>& wrapper_error) {
   __FRAME_CATCH_AND_ASSIGN_GS_ERROR(
       wrapper_error, detail::Query(worker_handler, query_args, context_key,
-                                   frag_wrapper, ctx_wrapper, wrapper_error));
+                                   frag_wrapper, ctx_wrapper));
 }
 
 }  // extern "C"
diff --git a/analytical_engine/frame/flash_app_frame.cc b/analytical_engine/frame/flash_app_frame.cc
index eeedaf659963..63c01c7a12df 100644
--- a/analytical_engine/frame/flash_app_frame.cc
+++ b/analytical_engine/frame/flash_app_frame.cc
@@ -82,25 +82,21 @@ __attribute__((visibility("hidden"))) std::nullptr_t DeleteWorker(
   return nullptr;
 }
 
-__attribute__((visibility("hidden"))) std::nullptr_t Query(
+__attribute__((visibility("hidden"))) bl::result<std::nullptr_t> Query(
     void* worker_handler, const gs::rpc::QueryArgs& query_args,
     const std::string& context_key,
     std::shared_ptr<gs::IFragmentWrapper> frag_wrapper,
-    std::shared_ptr<gs::IContextWrapper>& ctx_wrapper,
-    bl::result<nullptr_t>& wrapper_error) {
+    std::shared_ptr<gs::IContextWrapper>& ctx_wrapper) {
   auto worker = static_cast<worker_handler_t*>(worker_handler)->worker;
   auto result = gs::FlashAppInvoker<_APP_TYPE>::Query(worker, query_args);
-  if (!result) {
-    wrapper_error = std::move(result);
-    return nullptr;
+  if (result) {
+    if (!context_key.empty()) {
+      auto ctx = worker->GetContext();
+      ctx_wrapper = gs::CtxWrapperBuilder<typename _APP_TYPE::context_t>::build(
+          context_key, frag_wrapper, ctx);
+    }
   }
-
-  if (!context_key.empty()) {
-    auto ctx = worker->GetContext();
-    ctx_wrapper = gs::CtxWrapperBuilder<typename _APP_TYPE::context_t>::build(
-        context_key, frag_wrapper, ctx);
-  }
-  return nullptr;
+  return result;
 }
 }  // namespace detail
 extern "C" {
@@ -125,6 +121,6 @@ void Query(void* worker_handler, const gs::rpc::QueryArgs& query_args,
            bl::result<nullptr_t>& wrapper_error) {
   __FRAME_CATCH_AND_ASSIGN_GS_ERROR(
       wrapper_error, detail::Query(worker_handler, query_args, context_key,
-                                   frag_wrapper, ctx_wrapper, wrapper_error));
+                                   frag_wrapper, ctx_wrapper));
 }
 }  // extern "C"
diff --git a/analytical_engine/test/run_app.h b/analytical_engine/test/run_app.h
index 292f3aba84d1..07147d7fc326 100644
--- a/analytical_engine/test/run_app.h
+++ b/analytical_engine/test/run_app.h
@@ -286,14 +286,16 @@ void Run() {
     using AppType = grape::WCC<GraphType>;
     CreateAndQuery<GraphType, AppType>(comm_spec, efile, vfile, out_prefix,
                                        FLAGS_datasource, fnum, spec);
-  } else if (name == "wcc_opt") {
-    using GraphType =
-        grape::ImmutableEdgecutFragment<OID_T, VID_T, VDATA_T, EDATA_T,
-                                        grape::LoadStrategy::kBothOutIn,
-                                        VertexMapType>;
-    using AppType = grape::WCCOpt<GraphType>;
-    CreateAndQuery<GraphType, AppType>(comm_spec, efile, vfile, out_prefix,
-                                       FLAGS_datasource, fnum, spec);
+    // skip to help CI runners to pass the compilation without OOM.
+    //
+    // } else if (name == "wcc_opt") {
+    //   using GraphType =
+    //       grape::ImmutableEdgecutFragment<OID_T, VID_T, VDATA_T, EDATA_T,
+    //                                       grape::LoadStrategy::kBothOutIn,
+    //                                       VertexMapType>;
+    //   using AppType = grape::WCCOpt<GraphType>;
+    //   CreateAndQuery<GraphType, AppType>(comm_spec, efile, vfile, out_prefix,
+    //                                      FLAGS_datasource, fnum, spec);
   } else if (name == "lcc_auto") {
     using GraphType =
         grape::ImmutableEdgecutFragment<OID_T, VID_T, VDATA_T, EDATA_T,
diff --git a/python/graphscope/analytical/app/__init__.py b/python/graphscope/analytical/app/__init__.py
index 016eb87a0374..68189364c384 100644
--- a/python/graphscope/analytical/app/__init__.py
+++ b/python/graphscope/analytical/app/__init__.py
@@ -33,6 +33,7 @@
 from graphscope.analytical.app.clustering import avg_clustering
 from graphscope.analytical.app.clustering import clustering
 from graphscope.analytical.app.clustering import lcc
+from graphscope.analytical.app.custom import custom_analytical_algorithm
 
 # fmt: off
 from graphscope.analytical.app.degree_assortativity_coefficient import \
diff --git a/python/graphscope/analytical/app/custom.py b/python/graphscope/analytical/app/custom.py
new file mode 100644
index 000000000000..3a7e3db49b4a
--- /dev/null
+++ b/python/graphscope/analytical/app/custom.py
@@ -0,0 +1,73 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# Copyright 2020 Alibaba Group Holding Limited. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+import logging
+
+from graphscope.framework.app import AppAssets
+from graphscope.framework.app import not_compatible_for
+from graphscope.framework.app import project_to_simple
+
+__all__ = ["custom_analytical_algorithm"]
+
+logger = logging.getLogger("graphscope")
+
+
+@project_to_simple
+def custom_analytical_algorithm(
+    graph, algorithm, *args, context="vertex_data", cmake_extra_options=None, **kwargs
+):
+    """A special application DAG node to running arbitrary supported algorithms.
+
+    Note that this is only for debugging/profiling usage for developers and
+    the application should be defined in .gs_conf.yaml in coordinator.
+
+    Args:
+        graph (:class:`graphscope.Graph`): A simple graph.
+        algorithm (:code:`str`): A predefined algorithm name,
+            e.g., `sssp`, `wcc`, `lcc`, etc.
+        context (:code:`str`): The context type of the algorithm,
+            e.g., `vertex_data`, etc. Defaults to `vertex_data`.
+        *args: Variable length argument list.
+        **kwargs: Arbitrary keyword arguments.
+
+    Returns:
+        :class:`graphscope.framework.context.ContextDAGNode`:
+            A context, evaluated in eager mode.
+
+    Examples:
+
+    .. code:: python
+
+        >>> import graphscope
+        >>> from graphscope.dataset import load_p2p_network
+        >>> sess = graphscope.session(cluster_type="hosts", mode="eager")
+        >>>
+        >>> g = load_p2p_network(sess)
+        >>>
+        >>> # project to a simple graph (if needed)
+        >>> pg = g.project(vertices={"host": ["id"]}, edges={"connect": ["dist"]})
+        >>>
+        >>> c = graphscope.custom_analytical_algorithm(pg, 'wcc')
+        >>>
+        >>> c = graphscope.custom_analytical_algorithm(pg, 'sssp', 6)
+        >>>
+        >>> sess.close()
+    """
+    return AppAssets(
+        algo=algorithm, context=context, cmake_extra_options=cmake_extra_options
+    )(graph, *args, **kwargs)
diff --git a/python/graphscope/analytical/app/sssp.py b/python/graphscope/analytical/app/sssp.py
index 41ff686b38e9..d09cf930497a 100644
--- a/python/graphscope/analytical/app/sssp.py
+++ b/python/graphscope/analytical/app/sssp.py
@@ -63,12 +63,12 @@ def sssp(graph, src=0, weight=None):
     """
     if not isinstance(graph, GraphDAGNode):
         if graph.schema.edata_type == graph_def_pb2.NULLVALUE:
-            raise RuntimeError(
+            raise ValueError(
                 "The edge data is empty, and the edge data type should be integers or "
-                "floating point numbers to run SSSP. Suggest to use bfs() algorithm."
+                "floating point numbers to run SSSP. Use the `bfs()` algorithm instead."
             )
         if graph.schema.edata_type == graph_def_pb2.STRING:
-            raise RuntimeError(
+            raise ValueError(
                 "The edge data type is string, and the edge data type should be "
                 "integers or floating point numbers to run SSSP."
             )
diff --git a/python/graphscope/analytical/app/wcc.py b/python/graphscope/analytical/app/wcc.py
index 347d1da55716..59a7793f4505 100644
--- a/python/graphscope/analytical/app/wcc.py
+++ b/python/graphscope/analytical/app/wcc.py
@@ -22,7 +22,7 @@
 from graphscope.framework.app import not_compatible_for
 from graphscope.framework.app import project_to_simple
 
-__all__ = ["wcc", "wcc_auto", "wcc_projected"]
+__all__ = ["wcc", "wcc_opt", "wcc_auto", "wcc_projected"]
 
 logger = logging.getLogger("graphscope")
 
diff --git a/python/graphscope/tests/unittest/test_app.py b/python/graphscope/tests/unittest/test_app.py
index de833f4d9838..92d56695c360 100644
--- a/python/graphscope/tests/unittest/test_app.py
+++ b/python/graphscope/tests/unittest/test_app.py
@@ -27,6 +27,7 @@
 from graphscope import avg_clustering
 from graphscope import bfs
 from graphscope import clustering  # directed / undirected would call different app
+from graphscope import custom_analytical_algorithm
 from graphscope import degree_centrality
 from graphscope import eigenvector_centrality
 from graphscope import hits
@@ -248,12 +249,17 @@ def test_run_app_on_string_oid_graph(p2p_project_undirected_graph_string):
     r1 = ctx.to_dataframe({"node": "v.id", "r": "r"})
 
 
-@pytest.mark.skipif("FULL_TEST_SUITE" not in os.environ, reason="Run in nightly CI")
 def test_error_on_run_app(projected_pg_no_edge_data):
     # compile error: wrong type of edge data with sssp
-    with pytest.raises(graphscope.CompilationError):
+    with pytest.raises(ValueError):
         sssp(projected_pg_no_edge_data, src=4)
 
+    with pytest.raises(
+        graphscope.AnalyticalEngineInternalError,
+        match="args_num >= query_args.args_size()",
+    ):
+        custom_analytical_algorithm(projected_pg_no_edge_data, "wcc", 1, 2, 3)
+
 
 def test_app_on_local_vm_graph(
     p2p_property_graph_undirected_local_vm,