code: public void update(AliasDefinition newAliasDef) {
          assert m_aliasName.equals(newAliasDef.m_aliasName);
          assert m_tableName.equals(newAliasDef.m_tableName);
          
          // Currently, all we have to do is copy over the "expression" property.
          m_expression = newAliasDef.m_expression;
      }
docs: Update this alias definition to match the given updated one. The updated alias must
  have the same name and table name.
  
  @param newAliasDef   Updated alias definition.