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[NO ISSUE][COMP] Window operator runtime optimization

- user model changes: no

- storage format changes: no

- interface changes: no


- Add optimized runtime for window operator that computes

nested aggregates over the whole partition (unbounded frame)

- Do not generate unnecessary expressions when compiling

window operator with unbounded frame

Change-Id: If34d8eb05c069257c974f61810bee399136825fa


Tested-by: Jenkins <>

Integration-Tests: Jenkins <>

Contrib: Jenkins <>

Reviewed-by: Ali Alsuliman <>

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