UPSERT and HOT-update

"CHENG Yuk-Pong, Daniel " <j16sdiz@xxxxxxxxx> · Wed, 16 Mar 2016 16:53:36 +0800

Hi List,

I am doing a INSERT...ON CONFLICT...UPDATE.. on a table. The query is
mostly-UPDATE and does not change any columns most of the time, like
so:

  CREATE INDEX ON book(title);
  INSERT INTO book (isbn, title, author, lastupdate) VALUES ($1,$2,$3, now())
    ON CONFLICT (isbn) DO UPDATE set title=excluded.title,
author=excluded.author, lastupdate=excluded.lastupdate;

PostgreSQL seems to consider the title as changed and refused to do a
HOT-update. It works if I remove the `title=...` part.

Are there any tricks to make it smarter? The title don't change most
of the time after all.

Regards,
Daniel

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