Fix error message of proto parser not clear (#26365)

Signed-off-by: longjiquan <jiquan.long@zilliz.com>

internal/core/src/query/PlanProto.cpp

@@ -699,8 +699,11 @@ ProtoParser::ParseExpr(const proto::plan::Expr& expr_pb) {
         case ppe::kJsonContainsExpr: {
             return ParseJsonContainsExpr(expr_pb.json_contains_expr());
         }
-        default:
-            PanicInfo("unsupported expr proto node");
+        default: {
+            std::string s;
+            google::protobuf::TextFormat::PrintToString(expr_pb, &s);
+            PanicInfo(std::string("unsupported expr proto node: ") + s);
+        }
     }
 }
 

internal/core/unittest/CMakeLists.txt

@@ -53,7 +53,8 @@ set(MILVUS_TEST_FILES
         test_integer_overflow.cpp
         test_offset_ordered_map.cpp
         test_offset_ordered_array.cpp
-        test_always_true_expr.cpp)
+        test_always_true_expr.cpp
+        test_plan_proto.cpp)
 
 if ( BUILD_DISK_ANN STREQUAL "ON" )
     set(MILVUS_TEST_FILES

internal/core/unittest/test_plan_proto.cpp

@@ -0,0 +1,32 @@
+// Copyright (C) 2019-2020 Zilliz. 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
+
+#include <gtest/gtest.h>
+#include <memory>
+#include <regex>
+#include <vector>
+#include <chrono>
+
+#include "query/PlanProto.h"
+
+TEST(PlanProto, NotSetUnsupported) {
+    using namespace milvus;
+    using namespace milvus::query;
+    auto schema = std::make_shared<Schema>();
+    auto vec_fid = schema->AddDebugField(
+        "fakevec", DataType::VECTOR_FLOAT, 16, knowhere::metric::L2);
+    auto i64_fid = schema->AddDebugField("age", DataType::INT64);
+    schema->set_primary_field_id(i64_fid);
+
+    proto::plan::Expr expr_pb;
+    ProtoParser parser(*schema);
+    ASSERT_ANY_THROW(parser.ParseExpr(expr_pb));
+}