[Fix](Variant) implement some interface in ColumnNothing

IColumnDummy implementation is not suitable for ColumnNothing in ColumnObject

be/src/vec/columns/column_nothing.h

@@ -32,6 +32,19 @@ class ColumnNothing final : public COWHelper<IColumnDummy, ColumnNothing> {
 
     ColumnNothing(const ColumnNothing&) = default;
 
+    ColumnPtr permute(const Permutation& perm, size_t limit) const override {
+        return clone_dummy(limit ? std::min(s, limit) : s);
+    }
+    Field operator[](size_t) const override {
+        return {};
+    }
+    void get(size_t, Field& f) const override {
+        f = {};
+    }
+    void insert(const Field&) override {
+        ++s;
+    }
+
 public:
     const char* get_family_name() const override { return "Nothing"; }
     MutableColumnPtr clone_dummy(size_t s_) const override { return ColumnNothing::create(s_); }