[Enchancement](column) make create_always_true_column return column c…

…onst (#39086)

## Proposed changes
make create_always_true_column return column const

be/src/vec/utils/util.hpp

@@ -173,12 +173,12 @@ inline std::string remove_suffix(const std::string& name, const std::string& suf
 };
 
 inline ColumnPtr create_always_true_column(size_t size, bool is_nullable) {
-    auto res_data_column = ColumnUInt8::create(size, 1);
+    ColumnPtr res_data_column = ColumnUInt8::create(1, 1);
     if (is_nullable) {
-        auto null_map = ColumnVector<UInt8>::create(size, 0);
-        return ColumnNullable::create(std::move(res_data_column), std::move(null_map));
+        auto null_map = ColumnVector<UInt8>::create(1, 0);
+        res_data_column = ColumnNullable::create(res_data_column, std::move(null_map));
     }
-    return res_data_column;
+    return ColumnConst::create(std::move(res_data_column), size);
 }
 
 // change null element to true element