SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function mapSort (children 1)
     ExpressionList (children 2)
      Function lambda (children 1)
       ExpressionList (children 2)
        Function tuple (children 1)
         ExpressionList (children 2)
          Identifier k
          Identifier v
        Identifier k
      Function map (children 1)
       ExpressionList (children 4)
        Function CAST (children 1)
         ExpressionList (children 2)
          Literal \'0.1\'
          Literal \'Float32\'
        Literal UInt64_4
        Function CAST (children 1)
         ExpressionList (children 2)
          Literal \'0.2\'
          Literal \'Float32\'
        Literal UInt64_5
