this is an enhancement not a bug so sending in a general inbox.
That may have been your intent but that isn't what happened.
I have want to change rows to column without group by( there is no group by and filter help which is online).
In java iterating those rows will take extra time, I want to cut that time a little and I have to show the data.
Please if you can do something for it.
I don't understand what you are trying to communicate here. Perhaps an example query with desired output would aid others is evaluating your need and possible suggesting alternatives that work today and not just maybe some years from now. In particular see https://www.postgresql.org/docs/10/static/tablefunc.html if want you are wanting is some kind of Pivot Table feature.
