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Only WAL-log the modified portion in an UPDATE, if possible.
When a row is updated, and the new tuple version is put on the same page asthe old one, only WAL-log the part of the new tuple that's not identical tothe old. This saves significantly on the amount of WAL that needs to bewritten, in the common case that most fields are not modified.Amit Kapila, with a lot of back and forth with me, Robert Haas, and others.1 parent17d787a commita3115f0
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