fix(checker): correct return type for column aggregation

midas/checker/frames/column_groupby_methods.py

@@ -13,7 +13,6 @@ from midas.checker.types import (
     Function,
     ParamSpec,
     Type,
-    UnknownType,
 )
 
 if TYPE_CHECKING:
@@ -97,11 +96,9 @@ class ColumnGroupByMethodRegistry(MethodRegistry[Call]):
             positional=[],
             keywords={},
         )
-        if not isinstance(returns, ColumnType):
-            returns = ColumnType(type=UnknownType())
         signature = Function(
             params=ParamSpec(mixed=real_params),
-            returns=returns,
+            returns=ColumnType(type=returns),
         )
 
         result: CallResult = self.dispatcher.get_result(

midas/checker/frames/column_methods.py

@@ -364,14 +364,12 @@ class ColumnMethodRegistry(MethodRegistry[Call]):
             Type: the result type
         """
 
-        returns: Type = ColumnType(type=TopType())
+        returns: Type = TopType()
         if formula:
-            returns = ColumnType(
-                type=self._resolve_formula_type(
+            returns = self._resolve_formula_type(
                 call,
                 formula(call.column.type),
             )
-            )
         signature = Function(
             params=ParamSpec(
                 kw=[

tests/cases/checker/09_frame_ops.py.ref.json

@@ -4305,9 +4305,7 @@
         "arguments": [],
         "keywords": {}
       },
-      "type": {
       "type": {}
-      }
     },
     {
       "location": {
@@ -4342,9 +4340,7 @@
         "arguments": [],
         "keywords": {}
       },
-      "type": {
       "type": {}
-      }
     },
     {
       "location": {
@@ -4379,11 +4375,9 @@
         "arguments": [],
         "keywords": {}
       },
-      "type": {
       "type": {
         "name": "int"
       }
-      }
     },
     {
       "location": {
@@ -4418,11 +4412,9 @@
         "arguments": [],
         "keywords": {}
       },
-      "type": {
       "type": {
         "name": "float"
       }
-      }
     },
     {
       "location": {
@@ -4457,11 +4449,9 @@
         "arguments": [],
         "keywords": {}
       },
-      "type": {
       "type": {
         "name": "int"
       }
-      }
     },
     {
       "location": {
@@ -4496,11 +4486,9 @@
         "arguments": [],
         "keywords": {}
       },
-      "type": {
       "type": {
         "name": "int"
       }
-      }
     },
     {
       "location": {
@@ -4535,11 +4523,9 @@
         "arguments": [],
         "keywords": {}
       },
-      "type": {
       "type": {
         "name": "int"
       }
-      }
     },
     {
       "location": {
@@ -4574,11 +4560,9 @@
         "arguments": [],
         "keywords": {}
       },
-      "type": {
       "type": {
         "name": "int"
       }
-      }
     },
     {
       "location": {
@@ -4613,11 +4597,9 @@
         "arguments": [],
         "keywords": {}
       },
-      "type": {
       "type": {
         "name": "int"
       }
-      }
     },
     {
       "location": {
@@ -4652,9 +4634,7 @@
         "arguments": [],
         "keywords": {}
       },
-      "type": {
       "type": {}
-      }
     },
     {
       "location": {
@@ -4689,11 +4669,9 @@
         "arguments": [],
         "keywords": {}
       },
-      "type": {
       "type": {
         "name": "int"
       }
-      }
     },
     {
       "location": {
@@ -4728,9 +4706,7 @@
         "arguments": [],
         "keywords": {}
       },
-      "type": {
       "type": {}
-      }
     },
     {
       "location": {