What is OLD in INSTEAD OF trigger?

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От Jinhua Luo
Тема What is OLD in INSTEAD OF trigger?
Дата
Msg-id CAAc9rOxR-VQR-Bgy2TRf0ajYyAB3X5pygujc76mmbSBftPV84A@mail.gmail.com
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If the view definition is too complex to be automatic updateable, then
how postgresql defines OLD in INSTEAD OF trigger? It cannot bind any
column on any table directly then, right?

Unless postgresql refresh view as table source before executing
trigger? Then it may filter (WHERE sub-clause of UPDATE/DELETE) the
rows to be update, and use those rows as OLD?

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