AlterQuery  attach_partition_t7 (children 2)
 ExpressionList (children 1)
  AlterCommand ADD_COLUMN (children 1)
   ColumnDeclaration mat_column (children 2)
    DataType UInt32
    Function plus (children 1)
     ExpressionList (children 2)
      Identifier a
      Identifier b
 Identifier attach_partition_t7
