SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function array (alias arr) (children 1)
     ExpressionList
    Function multiIf (children 1)
     ExpressionList (children 5)
      Function empty (children 1)
       ExpressionList (children 1)
        Identifier arr
      Literal UInt64_0
      Function greater (children 1)
       ExpressionList (children 2)
        Function length (children 1)
         ExpressionList (children 1)
          Identifier arr
        Literal UInt64_1
      Function arrayElement (children 1)
       ExpressionList (children 2)
        Identifier arr
        Literal Int64_-1
      Literal UInt64_0
