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Hash indexes can contain both pages which are all-zeroes (i.e. PageIsNew()) and pages which have been initialized but currently aren't used. The latter category can happen either when a page has been reserved but not yet used or when it is used for a time and then freed. pgstattuple was only prepared to deal with the pages that are actually-zeroes, which it called zero_pages. Rename the column to unused_pages (extension version 1.5 is as-yet-unreleased) and make it count both kinds of unused pages. Along the way, slightly tidy up the way we test for pages of various types. Robert Haas and Ashutosh Sharma, reviewed by Amit Kapila Discussion: http://postgr.es/m/CAE9k0PkTtKFB3YndOyQMjwuHx+-FtUP1ynK8E-nHtetoow3NtQ@mail.gmail.com
The PostgreSQL contrib tree
---------------------------
This subtree contains porting tools, analysis utilities, and plug-in
features that are not part of the core PostgreSQL system, mainly
because they address a limited audience or are too experimental to be
part of the main source tree. This does not preclude their
usefulness.
User documentation for each module appears in the main SGML
documentation.
When building from the source distribution, these modules are not
built automatically, unless you build the "world" target. You can
also build and install them all by running "make all" and "make
install" in this directory; or to build and install just one selected
module, do the same in that module's subdirectory.
Some directories supply new user-defined functions, operators, or
types. To make use of one of these modules, after you have installed
the code you need to register the new SQL objects in the database
system by executing a CREATE EXTENSION command. In a fresh database,
you can simply do
CREATE EXTENSION module_name;
See the PostgreSQL documentation for more information about this
procedure.