SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function simpleJSONExtractFloat (alias res) (children 1)
     ExpressionList (children 2)
      Identifier json
      Literal \'a\'
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier jsons
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier res
