From 8f13a585f03faaa1473849d8318f9cee0f7f7a03 Mon Sep 17 00:00:00 2001
From: xtcyclist <7731943+xtcyclist@users.noreply.github.com>
Date: Fri, 16 Dec 2022 11:12:38 +0800
Subject: [PATCH] add a log(error)

---
 src/common/expression/AttributeExpression.cpp | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/common/expression/AttributeExpression.cpp b/src/common/expression/AttributeExpression.cpp
index db68851542a..f06be15732c 100644
--- a/src/common/expression/AttributeExpression.cpp
+++ b/src/common/expression/AttributeExpression.cpp
@@ -40,7 +40,18 @@ const Value &AttributeExpression::eval(ExpressionContext &ctx) {
        * ListComprehensionExpression without making structural changes to the implementation.
        */
       if (left()->kind() != Expression::Kind::kAttribute) {
-        return lvalue;
+        if (right()->kind() == Expression::Kind::kConstant &&
+            rvalue.type() == Value::Type::STRING) {
+          auto rStr = rvalue.getStr();
+          for (auto &tag : lvalue.getVertex().tags) {
+            if (rStr.compare(tag.name) == 0) {
+              return lvalue;
+            }
+          }
+          LOG(ERROR) << "Tag not found for: " << rStr
+                     << "Please check whether the related expression "
+                     << "follows the format of vertex.tag.property.";
+        }
       } else if (left()->kind() == Expression::Kind::kAttribute &&
                  dynamic_cast<AttributeExpression *>(left())->right()->kind() ==
                      Expression::Kind::kConstant) {