AlterQuery  t_block_number_mut (children 2)
 ExpressionList (children 1)
  AlterCommand UPDATE (children 2)
   Literal UInt64_1
   ExpressionList (children 1)
    Assignment n (children 1)
     Function plus (children 1)
      ExpressionList (children 2)
       Identifier n
       Literal UInt64_1
 Identifier t_block_number_mut
