AlterQuery  alter_table (children 2)
 ExpressionList (children 1)
  AlterCommand MODIFY_COLUMN (children 1)
   ColumnDeclaration b (children 2)
    DataType DateTime
    Function now (children 1)
     ExpressionList (children 1)
      Function in (children 1)
       ExpressionList (children 2)
        Function and (children 1)
         ExpressionList (children 4)
          Literal Array_[NULL, NULL, NULL, Array_[Int64_-2147483648], Array_[NULL, NULL, NULL, NULL, NULL, NULL, NULL]]
          Function and (children 1)
           ExpressionList (children 2)
            Literal UInt64_1048576
            Literal NULL
          Function and (children 1)
           ExpressionList (children 4)
            Literal NULL
            Literal UInt64_1048575
            Literal NULL
            Literal Int64_-2147483649
          Literal NULL
        Identifier test_01103.t1_distr.id
 Identifier alter_table