Don't inject an operation if its result is used multiple times. On the tpch sf 10 this gave the following situation. no joinpath optimizer  -> 914 sec default optimizer   	-> 860 sec new version				-> 800 sec
Don't inject an operation if its result is used multiple times.
On the tpch sf 10 this gave the following situation.
no joinpath optimizer  -> 914 sec
default optimizer   	-> 860 sec
new version				-> 800 sec

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb