AlterQuery  agg_func_col (children 2)
 ExpressionList (children 1)
  AlterCommand ADD_COLUMN (children 1)
   ColumnDeclaration af_gua (children 2)
    DataType AggregateFunction (children 1)
     ExpressionList (children 2)
      Identifier groupUniqArray
      DataType String
    Function arrayReduce (children 1)
     ExpressionList (children 2)
      Literal \'groupUniqArrayState\'
      Literal Array_[\'---\', \'---\']
 Identifier agg_func_col
