[Perf] Optimize stream nodes fanin and fanout #1250
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Description
The nodes
FanInandFanOutwere optimized in this PR.FanInnow doesn't use any reflection in case the pipeline consists of up to 6 sources. Beyond that amount, we fall back to reflection again.FanOuton the other hand uses a shortcut if there is only 1 destination - in that case it doesn't clone the record as there is no need.Quick checks: