diff --git a/tests/test_class_hierarchy.py b/tests/test_class_hierarchy.py
new file mode 100644
index 0000000..0f0ec1f
--- /dev/null
+++ b/tests/test_class_hierarchy.py
@@ -0,0 +1,79 @@
+import datetime
+import sys
+
+import pytest
+from pydantic import AnyUrl, UrlConstraints
+from typing_extensions import Annotated
+
+from sqlmodel import (
+    BigInteger,
+    Column,
+    DateTime,
+    Field,
+    Integer,
+    SQLModel,
+    String,
+    create_engine,
+)
+
+MoveSharedUrl = Annotated[
+    AnyUrl, UrlConstraints(max_length=512, allowed_schemes=["smb", "ftp", "file"])
+]
+
+
+@pytest.mark.skipif(sys.version_info < (3, 10))
+def test_field_resuse():
+    class BasicFileLog(SQLModel):
+        resourceID: int = Field(
+            sa_column=lambda: Column(Integer, index=True), description="""   """
+        )
+        transportID: Annotated[int | None, Field(description=" for ")] = None
+        fileName: str = Field(
+            sa_column=lambda: Column(String, index=True), description=""" """
+        )
+        fileSize: int | None = Field(
+            sa_column=lambda: Column(BigInteger), ge=0, description=""" """
+        )
+        beginTime: datetime.datetime | None = Field(
+            sa_column=lambda: Column(
+                DateTime(timezone=True),
+                index=True,
+            ),
+            description="",
+        )
+
+    class SendFileLog(BasicFileLog, table=True):
+        id: int | None = Field(
+            sa_column=Column(Integer, primary_key=True, autoincrement=True),
+            description="""   """,
+        )
+        sendUser: str
+        dstUrl: MoveSharedUrl | None
+
+    class RecvFileLog(BasicFileLog, table=True):
+        id: int | None = Field(
+            sa_column=Column(Integer, primary_key=True, autoincrement=True),
+            description="""   """,
+        )
+        recvUser: str
+
+    sqlite_file_name = "database.db"
+    sqlite_url = f"sqlite:///{sqlite_file_name}"
+
+    engine = create_engine(sqlite_url, echo=True)
+    SQLModel.metadata.drop_all(engine)
+    SQLModel.metadata.create_all(engine)
+    SendFileLog(
+        sendUser="j",
+        resourceID=1,
+        fileName="a.txt",
+        fileSize=3234,
+        beginTime=datetime.datetime.now(),
+    )
+    RecvFileLog(
+        sendUser="j",
+        resourceID=1,
+        fileName="a.txt",
+        fileSize=3234,
+        beginTime=datetime.datetime.now(),
+    )
diff --git a/tests/test_nullable.py b/tests/test_nullable.py
index c21d311..b4fa1bb 100644
--- a/tests/test_nullable.py
+++ b/tests/test_nullable.py
@@ -19,6 +19,8 @@ def test_nullable_fields(clear_sqlmodel, caplog):
         )
         required_value: str
         optional_default_ellipsis: Optional[str] = Field(default=...)
+        optional_no_field: Optional[str]
+        optional_no_field_default: Optional[str] = Field(description="no default")
         optional_default_none: Optional[str] = Field(default=None)
         optional_non_nullable: Optional[str] = Field(
             nullable=False,
@@ -55,7 +57,7 @@ def test_nullable_fields(clear_sqlmodel, caplog):
         str_default_str_nullable: str = Field(default="default", nullable=True)
         str_default_ellipsis_non_nullable: str = Field(default=..., nullable=False)
         str_default_ellipsis_nullable: str = Field(default=..., nullable=True)
-        annotated_any_url: MoveSharedUrl | None = Field(description="")
+        annotated_any_url: Optional[MoveSharedUrl] = Field(description="")
 
     engine = create_engine("sqlite://", echo=True)
     SQLModel.metadata.create_all(engine)
@@ -66,6 +68,8 @@ def test_nullable_fields(clear_sqlmodel, caplog):
     assert "primary_key INTEGER NOT NULL," in create_table_log
     assert "required_value VARCHAR NOT NULL," in create_table_log
     assert "optional_default_ellipsis VARCHAR NOT NULL," in create_table_log
+    assert "optional_no_field VARCHAR," in create_table_log
+    assert "optional_no_field_default VARCHAR NOT NULL," in create_table_log
     assert "optional_default_none VARCHAR," in create_table_log
     assert "optional_non_nullable VARCHAR NOT NULL," in create_table_log
     assert "optional_nullable VARCHAR," in create_table_log