SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function arrayMin (children 1)
     ExpressionList (children 2)
      Function lambda (children 1)
       ExpressionList (children 2)
        Function tuple (children 1)
         ExpressionList (children 1)
          Identifier x
        Function tupleElement (children 1)
         ExpressionList (children 2)
          Identifier x
          Literal UInt64_2
      Function array (children 1)
       ExpressionList (children 2)
        Literal Tuple_(UInt64_1, \'a\')
        Literal Tuple_(UInt64_0, \'b\')
