SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function JSONExtractString (children 1)
     ExpressionList (children 2)
      Identifier json
      Literal \'s\'
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Function arrayJoin (alias json) (children 1)
            ExpressionList (children 1)
             Literal Array_[\'{"s":"u"}\', \'{"s":"v"}\']