AlterQuery  test_02504 (children 2)
 ExpressionList (children 1)
  AlterCommand UPDATE (children 2)
   Function equals (children 1)
    ExpressionList (children 2)
     Function arrayJoin (children 1)
      ExpressionList (children 1)
       Literal Array_[UInt64_1, UInt64_2]
     Identifier a
   ExpressionList (children 1)
    Assignment b (children 1)
     Literal UInt64_33
 Identifier test_02504
