SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function multiIf (children 1)
     ExpressionList (children 5)
      Literal UInt64_1
      Literal \'A\'
      Literal UInt64_1
      Literal NULL
      Literal \'DEF\'