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09c1c6ab4b
Not much to say here: does what it says on the tin. We steal a previously-always-zero bit from the nextOffset field of leaf index tuples in order to track whether there is a nulls bitmap. Otherwise it works about like included columns in other index types. Pavel Borisov, reviewed by Andrey Borodin and Anastasia Lubennikova, and rather heavily editorialized on by me Discussion: https://postgr.es/m/CALT9ZEFi-vMp4faht9f9Junb1nO3NOSjhpxTmbm1UGLMsLqiEQ@mail.gmail.com