[FEA][Performance] Merge multiple "copy_if_else" for "case when" in the case of multiple branches
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winningsix commented
Is your feature request related to a problem? Please describe.
copy_if_else is an expensive operation (shown in below nsys trace) and it happens in the case of "case when". And there exists some opportunities we could avoid multiple copy_if_else and consolidate them into a single one.
Describe the solution you'd like
Consolidating multiple copy_if_else into a single one in case when without side effect case.