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Support INCLUDE'd columns in SP-GiST.

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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
This commit is contained in:
Tom Lane
2021-04-05 18:41:09 -04:00
parent 49f49defe7
commit 09c1c6ab4b
21 changed files with 630 additions and 232 deletions
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8
doc/src/sgml/spgist.sgml
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@ -216,6 +216,14 @@
inner tuples that are passed through to reach the leaf level.
</para>
<para>
When an <acronym>SP-GiST</acronym> index is created with
<literal>INCLUDE</literal> columns, the values of those columns are also
stored in leaf tuples. The <literal>INCLUDE</literal> columns are of no
concern to the <acronym>SP-GiST</acronym> operator class, so they are
not discussed further here.
</para>
<para>
Inner tuples are more complex, since they are branching points in the
search tree. Each inner tuple contains a set of one or more