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45e2544584
composite type capability makes it possible to create a system view
based on a table function in a way that is hopefully palatable to
everyone. The attached patch takes advantage of this, moving
show_all_settings() from contrib/tablefunc into the backend (renamed
all_settings(). It is defined as a builtin returning type RECORD. During
initdb a system view is created to expose the same information presently
available through SHOW ALL. For example:
test=# select * from pg_settings where name like '%debug%';
name | setting
-----------------------+---------
debug_assertions | on
debug_pretty_print | off
debug_print_parse | off
debug_print_plan | off
debug_print_query | off
debug_print_rewritten | off
wal_debug | 0
(7 rows)
Additionally during initdb two rules are created which make it possible
to change settings by updating the system view -- a "virtual table" as
Tom put it. Here's an example:
Joe Conway
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| .. | ||
| access | ||
| bootstrap | ||
| catalog | ||
| commands | ||
| executor | ||
| lib | ||
| libpq | ||
| mb | ||
| nodes | ||
| optimizer | ||
| parser | ||
| port | ||
| regex | ||
| rewrite | ||
| storage | ||
| tcop | ||
| utils | ||
| c.h | ||
| fmgr.h | ||
| funcapi.h | ||
| Makefile | ||
| miscadmin.h | ||
| pg_config.h.in | ||
| pg_config.h.win32 | ||
| pgstat.h | ||
| postgres.h | ||
| postgres_ext.h | ||
| postgres_fe.h | ||
| rusagestub.h | ||
| strdup.h | ||