Marius Eich

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Reordering more than traditional joins (e.g. outerjoins, antijoins) requires some care, since not all reorderings are valid. To prevent invalid plans, two approaches have been described in the literature. We show that both approaches still produce invalid plans. We present three conflict detectors. All of them are (1) correct, i.e., prevent invalid plans,(More)
A theoretical prediction by de Gennes suggests that the resistance in a FI/S/FI (where FI is a ferromagnetic insulator, and S is a superconductor) structure will depend on the magnetization direction of the two FI layers. We report a magnetotransport measurement in a EuS/Al/EuS structure, showing that an infinite magnetoresistance can be produced by tuning(More)
It has been a recognized fact for many years that query execution can benefit from pushing group-by operators down in the operator tree and applying them before a join. This so-called eager aggrega-tion reduces the size(s) of the join argument(s), making join evaluation faster. Lately, the idea enjoyed a revival when it was applied to outer joins for the(More)
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