AlterQuery  mem_test (children 2)
 ExpressionList (children 1)
  AlterCommand UPDATE (children 2)
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier b
     Literal UInt64_99
   ExpressionList (children 1)
    Assignment a (children 1)
     Literal UInt64_0
 Identifier mem_test
