Fix: In blueprint vars handle the case sensitive case in lookup

sqlmesh/core/context.py

@@ -314,7 +314,9 @@ def var(self, var_name: str, default: t.Optional[t.Any] = None) -> t.Optional[t.
 
     def blueprint_var(self, var_name: str, default: t.Optional[t.Any] = None) -> t.Optional[t.Any]:
         """Returns a blueprint variable value."""
-        return self._blueprint_variables.get(var_name.lower(), default)
+        return self._blueprint_variables.get(var_name) or self._blueprint_variables.get(
+            var_name.lower(), default
+        )
 
     def with_variables(
         self,

sqlmesh/core/macros.py

@@ -254,14 +254,20 @@ def evaluate_macros(
                 changed = True
                 variables = self.variables
 
-                if node.name not in self.locals and node.name.lower() not in variables:
+                if (
+                    node.name not in self.locals
+                    and node.name.lower() not in variables
+                    and node.name not in variables
+                ):
                     if not isinstance(node.parent, StagedFilePath):
                         raise SQLMeshError(f"Macro variable '{node.name}' is undefined.")
 
                     return node
 
                 # Precedence order is locals (e.g. @DEF) > blueprint variables > config variables
-                value = self.locals.get(node.name, variables.get(node.name.lower()))
+                value = self.locals.get(
+                    node.name, variables.get(node.name, variables.get(node.name.lower()))
+                )
                 if isinstance(value, list):
                     return exp.convert(
                         tuple(
@@ -532,7 +538,9 @@ def var(self, var_name: str, default: t.Optional[t.Any] = None) -> t.Optional[t.
 
     def blueprint_var(self, var_name: str, default: t.Optional[t.Any] = None) -> t.Optional[t.Any]:
         """Returns the value of the specified blueprint variable, or the default value if it doesn't exist."""
-        return (self.locals.get(c.SQLMESH_BLUEPRINT_VARS) or {}).get(var_name.lower(), default)
+        return (self.locals.get(c.SQLMESH_BLUEPRINT_VARS) or {}).get(var_name) or (
+            self.locals.get(c.SQLMESH_BLUEPRINT_VARS) or {}
+        ).get(var_name.lower(), default)
 
     @property
     def variables(self) -> t.Dict[str, t.Any]:

sqlmesh/core/model/common.py

@@ -199,7 +199,9 @@ def var(var_name: str, default: t.Optional[t.Any] = None) -> t.Optional[t.Any]:
 
         @staticmethod
         def blueprint_var(var_name: str, default: t.Optional[t.Any] = None) -> t.Optional[t.Any]:
-            return (blueprint_variables or {}).get(var_name.lower(), default)
+            return (blueprint_variables or {}).get(var_name) or (blueprint_variables or {}).get(
+                var_name.lower(), default
+            )
 
     env = prepare_env(python_env)
     local_env = dict.fromkeys(("context", "evaluator"), VariableResolutionContext)

tests/core/test_model.py

@@ -9463,6 +9463,58 @@ def test_blueprinting_with_quotes(tmp_path: Path) -> None:
     assert t.cast(exp.Query, m2.render_query()).sql() == '''SELECT 'c d' AS "c1", "c d" AS "c2"'''
 
 
+def test_blueprinting_with_uppercase_blueprint_names(tmp_path: Path) -> None:
+    init_example_project(tmp_path, engine_type="duckdb", template=ProjectTemplate.EMPTY)
+
+    template_with_uppercase_vars = tmp_path / "models/template_with_uppercase_vars.sql"
+    template_with_uppercase_vars.parent.mkdir(parents=True, exist_ok=True)
+    template_with_uppercase_vars.write_text(
+        """
+        MODEL (
+          name @{Customer_Name}.my_table,
+          blueprints (
+            (Customer_Name := customer1, Field_A := 'value1', Field_B := 100),
+            (Customer_Name := customer2, Field_A := 'value2', Field_B := 200),
+          ),
+        );
+
+        SELECT
+          @Customer_Name AS customer_name,
+          @Field_A AS field_a_macro,
+          @{Field_B} AS field_b_identifier,
+          @BLUEPRINT_VAR('Field_A') AS field_a_func,
+          @BLUEPRINT_VAR('Field_B') AS field_b_func_lower
+        """
+    )
+
+    ctx = Context(
+        config=Config(model_defaults=ModelDefaultsConfig(dialect="duckdb")), paths=tmp_path
+    )
+    assert len(ctx.models) == 2
+
+    m1 = ctx.get_model('"memory"."customer1"."my_table"', raise_if_missing=True)
+    m2 = ctx.get_model('"memory"."customer2"."my_table"', raise_if_missing=True)
+
+    # Verify that uppercase references in the query work correctly
+    query1 = t.cast(exp.Query, m1.render_query()).sql()
+    query2 = t.cast(exp.Query, m2.render_query()).sql()
+
+    assert '"customer1"' in query1
+    assert "'value1'" in query1
+    assert "100" in query1
+
+    assert '"customer2"' in query2
+    assert "'value2'" in query2
+    assert "200" in query2
+
+    # Verify exact query structure
+    expected_query1 = '''SELECT "customer1" AS "customer_name", 'value1' AS "field_a_macro", "100" AS "field_b_identifier", 'value1' AS "field_a_func", 100 AS "field_b_func_lower"'''
+    expected_query2 = '''SELECT "customer2" AS "customer_name", 'value2' AS "field_a_macro", "200" AS "field_b_identifier", 'value2' AS "field_a_func", 200 AS "field_b_func_lower"'''
+
+    assert query1 == expected_query1
+    assert query2 == expected_query2
+
+
 def test_blueprint_variable_precedence_sql(tmp_path: Path, assert_exp_eq: t.Callable) -> None:
     init_example_project(tmp_path, engine_type="duckdb", template=ProjectTemplate.EMPTY)