SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 3)
    Function arrayElement (children 1)
     ExpressionList (children 2)
      Literal Array_[UInt64_1, UInt64_2]
      Literal UInt64_3
    Function arrayElement (children 1)
     ExpressionList (children 2)
      Literal Array_[UInt64_1, NULL, UInt64_2]
      Literal UInt64_4
    Function arrayElement (children 1)
     ExpressionList (children 2)
      Function array (children 1)
       ExpressionList (children 2)
        Literal Tuple_(\'1\', UInt64_1)
        Literal Tuple_(\'2\', UInt64_2)
      Literal Int64_-3
