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 Map (children 1)
       ExpressionList (children 2)
        DataType LowCardinality (children 1)
         ExpressionList (children 1)
          DataType String
        DataType UInt64
 Identifier cool_table
