SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 3)
    Function map (alias m) (children 1)
     ExpressionList (children 4)
      Literal \'key1\'
      Identifier number
      Literal \'key2\'
      Function multiply (children 1)
       ExpressionList (children 2)
        Identifier number
        Literal UInt64_2
    Function toJSONString (alias s) (children 1)
     ExpressionList (children 1)
      Identifier m
    Function isValidJSON (children 1)
     ExpressionList (children 1)
      Identifier s
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function numbers (children 1)
       ExpressionList (children 2)
        Literal UInt64_1
        Literal UInt64_1
