SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 5)
    Function tuple (children 1)
     ExpressionList (children 2)
      Identifier number
      Literal \'key\'
    Function dictHas (children 1)
     ExpressionList (children 2)
      Literal \'complex_key_dictionary\'
      Function tuple (children 1)
       ExpressionList (children 2)
        Identifier number
        Literal \'key\'
    Function dictGetOrNull (children 1)
     ExpressionList (children 3)
      Literal \'complex_key_dictionary\'
      Literal \'value\'
      Function tuple (children 1)
       ExpressionList (children 2)
        Identifier number
        Literal \'key\'
    Function dictGetOrNull (children 1)
     ExpressionList (children 3)
      Literal \'complex_key_dictionary\'
      Literal \'value_nullable\'
      Function tuple (children 1)
       ExpressionList (children 2)
        Identifier number
        Literal \'key\'
    Function dictGetOrNull (children 1)
     ExpressionList (children 3)
      Literal \'complex_key_dictionary\'
      Literal Tuple_(\'value\', \'value_nullable\')
      Function tuple (children 1)
       ExpressionList (children 2)
        Identifier number
        Literal \'key\'
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.numbers
   Literal UInt64_5
