SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function jsonMergePatch (children 1)
     ExpressionList (children 3)
      Literal \'{ "a": 1, "b":2 }\'
      Literal \'{ "a": 3, "c":4 }\'
      Literal \'{ "a": 5, "d":6 }\'
