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Works basically as a normal Join operator with one exception: elements on the left input will be transfered even if there is no join partner. In this case the schema will be filled with null values.


See Join operator.


bidWnd = ELEMENTWINDOW({SIZE = 1}, bid)
auctionWnd = ELEMENTWINDOW({SIZE = 1}, auction)
out = LEFTJOIN({predicate='id=auction'}, auctionWnd, bidWnd)
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