make the header not changed when do optimization

[liukun4515]

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In thist pr #3444

we provide a discussion about the header of the result.

The result always changes if do some optimization.
I have be stucked by this issue for doing this pr #3396

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[Dandandan]

Also see #279 #280 for extra context and a proposed implementation

[liukun4515]

Also see #279 #280 for extra context and a proposed implementation

when are we going to merge or review them？ @Dandandan

[Dandandan]

Also see #279 #280 for extra context and a proposed implementation

when are we going to merge or review them？ @Dandandan

I think the PR is outdated. I think someone (you maybe?) can look at the changes and update the tests so it can be reviewed again 👍