Hello Alvaro,
These duplicate entries caused by the zone attribute. If you'll remove
it, you'll get only single entry (in secondary line).
It seems that the following DocBook bugfix introduced the bug you
encountered:
https://github.com/docbook/xslt10-stylesheets/commit/f555842b
I see the following solutions for the issue:
1. To customize this xsl template (remove @zone check) for our docs.
2. To remove @zone specification from indexterm's.
Are there any reasons to specify it explicitly?
<sect2 id="vacuum-for-statistics">
<title>Updating Planner Statistics</title>
<indexterm zone="vacuum-for-statistics">
<primary>statistics</primary>
<secondary>of the planner</secondary>
</indexterm>
(DocBook documentation <http://tdg.docbook.org/tdg/4.5/indexterm.html>
says:
/|Zone|//holds the IDs of the elements to which it applies./
So here "zone" specifies a single point. But to mark a single point we
don't need to specify a zone.
/A single point is marked with an //|IndexTerm|
<http://tdg.docbook.org/tdg/4.5/indexterm.html>//placed in the text at
the point of reference./)
(We have about 800 "zone" specifications, but as the issue arises only
with <secondary>, it decreases to about 160 entries.)
3. To report an issue to docbook and get some feedback (but I'm afraid
it can take months).
Best regards,
Alexander
15.03.2017 19:05, Alvaro Herrera wrote:
While reviewing Tomas' extended statistics patch I noticed that the new
docbook toolchain produces additional links for each indexterm, based on
the <secondary> tags there are. For instance, in 9.5 I see this:
statistics, Aggregate Functions, The Statistics Collector
of the planner, Statistics Used by the Planner, Updating Planner Statistics
https://www.postgresql.org/docs/9.5/static/bookindex.html#AEN186176
while in 10 I see this for the same source:
statistics, Aggregate Functions, Statistics Used by the Planner, Updating
Planner Statistics, The Statistics Collector
of the planner, Statistics Used by the Planner, Updating Planner Statistics
https://www.postgresql.org/docs/devel/static/bookindex.html#indexdiv-S
Note that the links for entries on the <secondary>of the planner</> also
show up in the first list of links.
Is this intended? As we get more <secondary> entries, this gets busy
real quick, for no gain that I can see. For instance, I added this
entry:
<indexterm zone="extended-statistics">
<primary>statistics</primary>
<secondary>of the planner</secondary>
<tertiary>extended</tertiary>
</indexterm>
and this results in:
statistics, Aggregate Functions, Statistics Used by the Planner, Updating
Planner Statistics, The Statistics Collector, Extended Statistics
of the planner, Statistics Used by the Planner, Updating Planner
Statistics, Extended Statistics
extended, Extended Statistics
which seems altogether excessive. Perhaps this is a bug in the index
generation?
FWIW I'm leaning towards removing the <tertiary> in the new entry, which
results in this:
statistics, Aggregate Functions, Statistics Used by the Planner, Updating
Planner Statistics, The Statistics Collector, Extended Statistics
of the planner, Statistics Used by the Planner, Updating Planner
Statistics, Extended Statistics
I think this would be better:
statistics, Aggregate Functions, The Statistics Collector
of the planner, Statistics Used by the Planner, Updating Planner
Statistics, Extended Statistics
