AlterQuery  cool_table (children 2)
 ExpressionList (children 1)
  AlterCommand ADD_COLUMN (children 1)
   ColumnDeclaration n.lc2 (children 1)
    DataType Array (children 1)
     ExpressionList (children 1)
      DataType Array (children 1)
       ExpressionList (children 1)
        DataType LowCardinality (children 1)
         ExpressionList (children 1)
          DataType String
 Identifier cool_table
