fix todo

weed/query/engine/test_noschema_error.go

@@ -0,0 +1,38 @@
+package engine
+
+import (
+	"errors"
+	"fmt"
+	"testing"
+)
+
+func TestNoSchemaError(t *testing.T) {
+	// Test creating a NoSchemaError
+	err := NoSchemaError{Namespace: "test", Topic: "topic1"}
+	expectedMsg := "topic test.topic1 has no schema"
+	if err.Error() != expectedMsg {
+		t.Errorf("Expected error message '%s', got '%s'", expectedMsg, err.Error())
+	}
+
+	// Test IsNoSchemaError with direct NoSchemaError
+	if !IsNoSchemaError(err) {
+		t.Error("IsNoSchemaError should return true for NoSchemaError")
+	}
+
+	// Test IsNoSchemaError with wrapped NoSchemaError
+	wrappedErr := fmt.Errorf("wrapper: %w", err)
+	if !IsNoSchemaError(wrappedErr) {
+		t.Error("IsNoSchemaError should return true for wrapped NoSchemaError")
+	}
+
+	// Test IsNoSchemaError with different error type
+	otherErr := errors.New("different error")
+	if IsNoSchemaError(otherErr) {
+		t.Error("IsNoSchemaError should return false for other error types")
+	}
+
+	// Test IsNoSchemaError with nil
+	if IsNoSchemaError(nil) {
+		t.Error("IsNoSchemaError should return false for nil")
+	}
+}