SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function caseWithExpression (alias value) (children 1)
     ExpressionList (children 4)
      Literal UInt64_1
      Literal UInt64_1
      Literal \'a\'
      Literal NULL
