AlterQuery  t_update_prewhere (children 2)
 ExpressionList (children 1)
  AlterCommand UPDATE (children 2)
   Function notEquals (children 1)
    ExpressionList (children 2)
     Identifier c1
     Literal UInt64_0
   ExpressionList (children 1)
    Assignment c3 (children 1)
     Function multiply (children 1)
      ExpressionList (children 2)
       Identifier c2
       Literal UInt64_2
 Identifier t_update_prewhere
