AlterQuery  t_update_prewhere (children 2)
 ExpressionList (children 1)
  AlterCommand UPDATE (children 2)
   Function less (children 1)
    ExpressionList (children 2)
     Identifier c3
     Literal UInt64_10000
   ExpressionList (children 1)
    Assignment c2 (children 1)
     Function minus (children 1)
      ExpressionList (children 2)
       Identifier c3
       Identifier c1
 Identifier t_update_prewhere
