AlterQuery  tab (children 2)
 ExpressionList (children 1)
  AlterCommand UPDATE (children 2)
   Literal UInt64_1
   ExpressionList (children 1)
    Assignment x (children 1)
     Function plus (children 1)
      ExpressionList (children 2)
       Identifier x
       Function sleepEachRow (children 1)
        ExpressionList (children 1)
         Literal Float64_0.1
 Identifier tab
