SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function dictHas (children 1)
     ExpressionList (children 2)
      Literal \'02176_test_complex_key_dictionary\'
      Function tuple (children 1)
       ExpressionList (children 2)
        Function toUInt64 (children 1)
         ExpressionList (children 1)
          Literal UInt64_0
        Literal \'0\'
