SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function JSONExtractString (children 1)
     ExpressionList (children 2)
      Literal \'["a", "b", "c", "d", "e"]\'
      Identifier idx
   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 idx) (children 1)
            ExpressionList (children 1)
             Literal Array_[UInt64_1, UInt64_2, UInt64_3, UInt64_4, UInt64_5]