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Allow users to opt out of returning FPI data and block data from pg_get_wal_block_info as an optimization. Testing has shown that this can make function execution over twice as fast in some cases. When pg_get_wal_block_info is called with "show_data := false", it always returns NULL values for its block_data and block_fpi_data bytea output parameters. Nothing else changes. In particular, the function will still return the usual per-block summary of block data/FPI space overhead. Use of "show_data := false" is therefore feasible with all queries that don't specifically require these raw binary strings. Follow-up to recent work in commit 122376f0. There still hasn't been a stable release with the pg_get_wal_block_info function, so no bump in the pg_walinspect extension version. Per suggestion from Melanie Plageman. Author: Peter Geoghegan <pg@bowt.ie> Discussion: https://postgr.es/m/CAAKRu_bJvbcYBRj2cN6G2xV7B7-Ja+pjTO1nEnEhRR8OXYiABA@mail.gmail.com Discussion: https://postgr.es/m/CAH2-Wzm9shOkEDM10_+qOZkRSQhKVxwBFiehH6EHWQQRd_rDPw@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.