AlterQuery  test3 (children 2)
 ExpressionList (children 1)
  AlterCommand ADD_COLUMN (children 1)
   ColumnDeclaration valid_column_2 (children 2)
    DataType String
    Function concat (children 1)
     ExpressionList (children 2)
      Identifier str
      Literal \'c\' (alias c)
 Identifier test3
