On Wed, Jan 05, 2022 at 11:36:41PM -0600, Justin Pryzby wrote:
> On Thu, Jan 06, 2022 at 02:19:08PM +0900, Michael Paquier wrote:
> > > + initStringInfo(&ret);
> > > + appendStringInfoChar(&ret, '{');
> > > +
> > > + if (flags & GUC_NO_SHOW_ALL)
> > > + appendStringInfo(&ret, "NO_SHOW_ALL,");
> > > + if (flags & GUC_NO_RESET_ALL)
> > > + appendStringInfo(&ret, "NO_RESET_ALL,");
> > > + if (flags & GUC_NOT_IN_SAMPLE)
> > > + appendStringInfo(&ret, "NOT_IN_SAMPLE,");
> > > + if (flags & GUC_EXPLAIN)
> > > + appendStringInfo(&ret, "EXPLAIN,");
> > > + if (flags & GUC_RUNTIME_COMPUTED)
> > > + appendStringInfo(&ret, "RUNTIME_COMPUTED,");
> > > +
> > > + /* Remove trailing comma, if any */
> > > + if (ret.len > 1)
> > > + ret.data[--ret.len] = '\0';
> >
> > The way of building the text array is incorrect here. See
I think you'll find that this is how it's done elsewhere in postgres.
In the frontend, see appendPQExpBufferChar and appendPGArray and 3e6e86abc.
On the backend, see: git grep -F "'{'" |grep -w appendStringInfoChar
I updated the patch with a regex to accommodate GUCs without '=', as needed
since f47ed79cc8.
--
Justin
>From eee345a1685a04eeb0fedf3ba9ad0fc6fe6e3d81 Mon Sep 17 00:00:00 2001
From: Justin Pryzby <[email protected]>
Date: Sun, 5 Dec 2021 23:22:04 -0600
Subject: [PATCH 1/2] check_guc: fix absurd number of false positives
Avoid false positives;
Avoid various assumptions;
Avoid list of exceptions;
Simplify shell/awk/sed/grep;
This requires GNU awk for RS as a regex.
---
src/backend/utils/misc/check_guc | 69 +++++---------------------------
1 file changed, 10 insertions(+), 59 deletions(-)
diff --git a/src/backend/utils/misc/check_guc b/src/backend/utils/misc/check_guc
index b171ef0e4ff..323ca13191b 100755
--- a/src/backend/utils/misc/check_guc
+++ b/src/backend/utils/misc/check_guc
@@ -1,78 +1,29 @@
-#!/bin/sh
+#! /bin/sh
+set -e
-## currently, this script makes a lot of assumptions:
+## this script makes some assumptions about the formatting of files it parses.
## in postgresql.conf.sample:
## 1) the valid config settings may be preceded by a '#', but NOT '# '
## (we use this to skip comments)
-## 2) the valid config settings will be followed immediately by ' ='
-## (at least one space preceding the '=')
-## in guc.c:
-## 3) the options have PGC_ on the same line as the option
-## 4) the options have '{' on the same line as the option
-
-## Problems
-## 1) Don't know what to do with TRANSACTION ISOLATION LEVEL
-
-## if an option is valid but shows up in only one file (guc.c but not
-## postgresql.conf.sample), it should be listed here so that it
-## can be ignored
-INTENTIONALLY_NOT_INCLUDED="debug_deadlocks in_hot_standby \
-is_superuser lc_collate lc_ctype lc_messages lc_monetary lc_numeric lc_time \
-pre_auth_delay role seed server_encoding server_version server_version_num \
-session_authorization trace_lock_oidmin trace_lock_table trace_locks trace_lwlocks \
-trace_notify trace_userlocks transaction_isolation transaction_read_only \
-zero_damaged_pages"
### What options are listed in postgresql.conf.sample, but don't appear
### in guc.c?
-# grab everything that looks like a setting and convert it to lower case
-SETTINGS=`grep ' =' postgresql.conf.sample |
-grep -v '^# ' | # strip comments
-sed -e 's/^#//' |
-awk '{print $1}'`
-
-SETTINGS=`echo "$SETTINGS" | tr 'A-Z' 'a-z'`
+# grab everything that looks like a setting
+SETTINGS=`sed '/^#[[:alnum:]]/!d; s/^#//; s/ =.*//; /^include/d' postgresql.conf.sample`
for i in $SETTINGS ; do
- hidden=0
## it sure would be nice to replace this with an sql "not in" statement
- ## it doesn't seem to make sense to have things in .sample and not in guc.c
-# for hidethis in $INTENTIONALLY_NOT_INCLUDED ; do
-# if [ "$hidethis" = "$i" ] ; then
-# hidden=1
-# fi
-# done
- if [ "$hidden" -eq 0 ] ; then
- grep -i '"'$i'"' guc.c > /dev/null
- if [ $? -ne 0 ] ; then
- echo "$i seems to be missing from guc.c";
- fi;
- fi
+ grep -i "\"$i\"" guc.c >/dev/null ||
+ echo "$i seems to be missing from guc.c";
done
### What options are listed in guc.c, but don't appear
### in postgresql.conf.sample?
# grab everything that looks like a setting and convert it to lower case
-
-SETTINGS=`grep '{.* PGC_' guc.c | awk '{print $1}' | \
- sed -e 's/{//g' -e 's/"//g' -e 's/,//'`
-
-SETTINGS=`echo "$SETTINGS" | tr 'A-Z' 'a-z'`
-
+SETTINGS=`gawk -F '[",]' 'BEGIN{RS="\n\t\\\\{\n"} /",[[:space:]]*PGC_.*.*gettext_noop/ && !/NOT_IN_SAMPLE/{print tolower($2)}' guc.c`
for i in $SETTINGS ; do
- hidden=0
- ## it sure would be nice to replace this with an sql "not in" statement
- for hidethis in $INTENTIONALLY_NOT_INCLUDED ; do
- if [ "$hidethis" = "$i" ] ; then
- hidden=1
- fi
- done
- if [ "$hidden" -eq 0 ] ; then
- grep -i '#'$i' ' postgresql.conf.sample > /dev/null
- if [ $? -ne 0 ] ; then
- echo "$i seems to be missing from postgresql.conf.sample";
- fi
- fi
+ grep "#$i " postgresql.conf.sample >/dev/null ||
+ echo "$i seems to be missing from postgresql.conf.sample";
done
--
2.17.1
>From f475b7eced95bb792c4509aa87373348b375742a Mon Sep 17 00:00:00 2001
From: Justin Pryzby <[email protected]>
Date: Wed, 8 Dec 2021 12:06:35 -0600
Subject: [PATCH 2/2] Expose GUC flags in SQL function; retire ./check_guc
---
src/backend/catalog/system_views.sql | 19 ++++-
src/backend/utils/misc/check_guc | 29 -------
src/backend/utils/misc/guc.c | 37 +++++++-
src/include/catalog/pg_proc.dat | 6 +-
src/test/regress/expected/guc.out | 122 +++++++++++++++++++++++++++
src/test/regress/expected/rules.out | 2 +-
src/test/regress/sql/guc.sql | 72 ++++++++++++++++
7 files changed, 252 insertions(+), 35 deletions(-)
delete mode 100755 src/backend/utils/misc/check_guc
diff --git a/src/backend/catalog/system_views.sql b/src/backend/catalog/system_views.sql
index 3cb69b1f87b..cdae0616bdd 100644
--- a/src/backend/catalog/system_views.sql
+++ b/src/backend/catalog/system_views.sql
@@ -582,7 +582,24 @@ FROM
JOIN pg_authid rol ON l.classoid = rol.tableoid AND l.objoid = rol.oid;
CREATE VIEW pg_settings AS
- SELECT * FROM pg_show_all_settings() AS A;
+ SELECT a.name,
+ a.setting,
+ a.unit,
+ a.category,
+ a.short_desc,
+ a.extra_desc,
+ a.context,
+ a.vartype,
+ a.source,
+ a.min_val,
+ a.max_val,
+ a.enumvals,
+ a.boot_val,
+ a.reset_val,
+ a.sourcefile,
+ a.sourceline,
+ a.pending_restart
+ FROM pg_show_all_settings() AS A;
CREATE RULE pg_settings_u AS
ON UPDATE TO pg_settings
diff --git a/src/backend/utils/misc/check_guc b/src/backend/utils/misc/check_guc
deleted file mode 100755
index 323ca13191b..00000000000
--- a/src/backend/utils/misc/check_guc
+++ /dev/null
@@ -1,29 +0,0 @@
-#! /bin/sh
-set -e
-
-## this script makes some assumptions about the formatting of files it parses.
-## in postgresql.conf.sample:
-## 1) the valid config settings may be preceded by a '#', but NOT '# '
-## (we use this to skip comments)
-
-### What options are listed in postgresql.conf.sample, but don't appear
-### in guc.c?
-
-# grab everything that looks like a setting
-SETTINGS=`sed '/^#[[:alnum:]]/!d; s/^#//; s/ =.*//; /^include/d' postgresql.conf.sample`
-
-for i in $SETTINGS ; do
- ## it sure would be nice to replace this with an sql "not in" statement
- grep -i "\"$i\"" guc.c >/dev/null ||
- echo "$i seems to be missing from guc.c";
-done
-
-### What options are listed in guc.c, but don't appear
-### in postgresql.conf.sample?
-
-# grab everything that looks like a setting and convert it to lower case
-SETTINGS=`gawk -F '[",]' 'BEGIN{RS="\n\t\\\\{\n"} /",[[:space:]]*PGC_.*.*gettext_noop/ && !/NOT_IN_SAMPLE/{print tolower($2)}' guc.c`
-for i in $SETTINGS ; do
- grep "#$i " postgresql.conf.sample >/dev/null ||
- echo "$i seems to be missing from postgresql.conf.sample";
-done
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 4c94f09c645..2cb84d68610 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -9634,6 +9634,36 @@ GetConfigOptionByName(const char *name, const char **varname, bool missing_ok)
return _ShowOption(record, true);
}
+/*
+ * Return an text[] array of the given flags (or a useful subset?) XXX
+ */
+static char *
+get_flags_array_text(int flags)
+{
+ StringInfoData ret;
+
+ initStringInfo(&ret);
+ appendStringInfoChar(&ret, '{');
+
+ if (flags & GUC_NO_SHOW_ALL)
+ appendStringInfo(&ret, "NO_SHOW_ALL,");
+ if (flags & GUC_NO_RESET_ALL)
+ appendStringInfo(&ret, "NO_RESET_ALL,");
+ if (flags & GUC_NOT_IN_SAMPLE)
+ appendStringInfo(&ret, "NOT_IN_SAMPLE,");
+ if (flags & GUC_EXPLAIN)
+ appendStringInfo(&ret, "EXPLAIN,");
+ if (flags & GUC_RUNTIME_COMPUTED)
+ appendStringInfo(&ret, "RUNTIME_COMPUTED,");
+
+ /* Remove trailing comma, if any */
+ if (ret.len > 1)
+ ret.data[--ret.len] = '\0';
+
+ appendStringInfoChar(&ret, '}');
+ return ret.data;
+}
+
/*
* Return GUC variable value by variable number; optionally return canonical
* form of name. Return value is palloc'd.
@@ -9861,6 +9891,9 @@ GetConfigOptionByNum(int varnum, const char **values, bool *noshow)
}
values[16] = (conf->status & GUC_PENDING_RESTART) ? "t" : "f";
+
+ /* flags */
+ values[17] = get_flags_array_text(conf->flags);
}
/*
@@ -9916,7 +9949,7 @@ show_config_by_name_missing_ok(PG_FUNCTION_ARGS)
* show_all_settings - equiv to SHOW ALL command but implemented as
* a Table Function.
*/
-#define NUM_PG_SETTINGS_ATTS 17
+#define NUM_PG_SETTINGS_ATTS 18
Datum
show_all_settings(PG_FUNCTION_ARGS)
@@ -9978,6 +10011,8 @@ show_all_settings(PG_FUNCTION_ARGS)
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 17, "pending_restart",
BOOLOID, -1, 0);
+ TupleDescInitEntry(tupdesc, (AttrNumber) 18, "flags",
+ TEXTARRAYOID, -1, 0);
/*
* Generate attribute metadata needed later to produce tuples from raw
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 0859dc81cac..1d7f6b4d376 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -6092,9 +6092,9 @@
{ oid => '2084', descr => 'SHOW ALL as a function',
proname => 'pg_show_all_settings', prorows => '1000', proretset => 't',
provolatile => 's', prorettype => 'record', proargtypes => '',
- proallargtypes => '{text,text,text,text,text,text,text,text,text,text,text,_text,text,text,text,int4,bool}',
- proargmodes => '{o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o}',
- proargnames => '{name,setting,unit,category,short_desc,extra_desc,context,vartype,source,min_val,max_val,enumvals,boot_val,reset_val,sourcefile,sourceline,pending_restart}',
+ proallargtypes => '{text,text,text,text,text,text,text,text,text,text,text,_text,text,text,text,int4,bool,_text}',
+ proargmodes => '{o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o}',
+ proargnames => '{name,setting,unit,category,short_desc,extra_desc,context,vartype,source,min_val,max_val,enumvals,boot_val,reset_val,sourcefile,sourceline,pending_restart,flags}',
prosrc => 'show_all_settings' },
{ oid => '3329', descr => 'show config file settings',
proname => 'pg_show_all_file_settings', prorows => '1000', proretset => 't',
diff --git a/src/test/regress/expected/guc.out b/src/test/regress/expected/guc.out
index 59da91ff04d..5f15b5680be 100644
--- a/src/test/regress/expected/guc.out
+++ b/src/test/regress/expected/guc.out
@@ -813,3 +813,125 @@ set default_with_oids to f;
-- Should not allow to set it to true.
set default_with_oids to t;
ERROR: tables declared WITH OIDS are not supported
+--
+-- Test GUC categories and flags.
+--
+CREATE TABLE pg_settings_flags AS SELECT name, category,
+ 'NO_SHOW_ALL' =ANY(flags) AS no_show_all,
+ 'NO_RESET_ALL' =ANY(flags) AS no_reset_all,
+ 'NOT_IN_SAMPLE' =ANY(flags) AS not_in_sample,
+ 'EXPLAIN' =ANY(flags) AS guc_explain,
+ 'COMPUTED' =ANY(flags) AS guc_computed
+ FROM pg_show_all_settings();
+-- test that GUCS are in postgresql.conf
+SELECT lower(name) FROM pg_settings_flags WHERE NOT not_in_sample EXCEPT
+SELECT regexp_replace(ln, '^#?([_[:alpha:]]+) (= .*|[^ ]*$)', '\1') AS guc
+FROM (SELECT regexp_split_to_table(pg_read_file('postgresql.conf'), '\n') AS ln) conf
+WHERE ln ~ '^#?[[:alpha:]]'
+ORDER BY 1;
+ lower
+-----------------------------
+ config_file
+ plpgsql.check_asserts
+ plpgsql.extra_errors
+ plpgsql.extra_warnings
+ plpgsql.print_strict_params
+ plpgsql.variable_conflict
+(6 rows)
+
+-- test that lines in postgresql.conf that look like GUCs are GUCs
+SELECT regexp_replace(ln, '^#?([_[:alpha:]]+) (= .*|[^ ]*$)', '\1') AS guc
+FROM (SELECT regexp_split_to_table(pg_read_file('postgresql.conf'), '\n') AS ln) conf
+WHERE ln ~ '^#?[[:alpha:]]'
+EXCEPT SELECT lower(name) FROM pg_settings_flags WHERE NOT not_in_sample
+ORDER BY 1;
+ guc
+-------------------
+ include
+ include_dir
+ include_if_exists
+(3 rows)
+
+-- test that section:DEVELOPER GUCs are flagged GUC_NOT_IN_SAMPLE:
+SELECT * FROM pg_settings_flags
+WHERE category='Developer Options' AND NOT not_in_sample
+ORDER BY 1;
+ name | category | no_show_all | no_reset_all | not_in_sample | guc_explain | guc_computed
+------+----------+-------------+--------------+---------------+-------------+--------------
+(0 rows)
+
+-- Maybe the converse:
+SELECT * FROM pg_settings_flags
+WHERE category NOT IN ('Developer Options', 'Preset Options') AND not_in_sample
+ORDER BY 1;
+ name | category | no_show_all | no_reset_all | not_in_sample | guc_explain | guc_computed
+------------------------+-------------------------------------------------+-------------+--------------+---------------+-------------+--------------
+ application_name | Reporting and Logging / What to Log | f | f | t | f | f
+ transaction_deferrable | Client Connection Defaults / Statement Behavior | f | t | t | f | f
+ transaction_isolation | Client Connection Defaults / Statement Behavior | f | t | t | f | f
+ transaction_read_only | Client Connection Defaults / Statement Behavior | f | t | t | f | f
+(4 rows)
+
+-- Most Query Tuning GUCs are flagged as EXPLAIN:
+SELECT * FROM pg_settings_flags
+WHERE category ~ '^Query Tuning' AND NOT guc_explain
+ORDER BY 1;
+ name | category | no_show_all | no_reset_all | not_in_sample | guc_explain | guc_computed
+---------------------------+--------------------------------------+-------------+--------------+---------------+-------------+--------------
+ default_statistics_target | Query Tuning / Other Planner Options | f | f | f | f | f
+(1 row)
+
+-- Maybe the converse:
+SELECT * FROM pg_settings_flags
+WHERE guc_explain AND NOT category ~ '^Query Tuning|^Resource Usage'
+ORDER BY 1;
+ name | category | no_show_all | no_reset_all | not_in_sample | guc_explain | guc_computed
+---------------------+-------------------------------------------------+-------------+--------------+---------------+-------------+--------------
+ force_parallel_mode | Developer Options | f | f | t | t | f
+ search_path | Client Connection Defaults / Statement Behavior | f | f | f | t | f
+(2 rows)
+
+-- GUCs flagged RUNTIME are Preset
+SELECT * FROM pg_settings_flags
+WHERE guc_computed AND NOT category='Preset Options'
+ORDER BY 1;
+ name | category | no_show_all | no_reset_all | not_in_sample | guc_explain | guc_computed
+------+----------+-------------+--------------+---------------+-------------+--------------
+(0 rows)
+
+-- PRESET GUCs are flagged NOT_IN_SAMPLE
+SELECT * FROM pg_settings_flags
+WHERE category='Preset Options' AND NOT not_in_sample
+ORDER BY 1;
+ name | category | no_show_all | no_reset_all | not_in_sample | guc_explain | guc_computed
+------+----------+-------------+--------------+---------------+-------------+--------------
+(0 rows)
+
+-- NO_SHOW_ALL implies NO_RESET_ALL:
+SELECT * FROM pg_settings_flags
+WHERE no_show_all AND NOT no_reset_all
+ORDER BY 1;
+ name | category | no_show_all | no_reset_all | not_in_sample | guc_explain | guc_computed
+------+----------+-------------+--------------+---------------+-------------+--------------
+(0 rows)
+
+-- Usually the converse:
+SELECT * FROM pg_settings_flags
+WHERE NOT no_show_all AND no_reset_all
+ORDER BY 1;
+ name | category | no_show_all | no_reset_all | not_in_sample | guc_explain | guc_computed
+------------------------+-------------------------------------------------+-------------+--------------+---------------+-------------+--------------
+ transaction_deferrable | Client Connection Defaults / Statement Behavior | f | t | t | f | f
+ transaction_isolation | Client Connection Defaults / Statement Behavior | f | t | t | f | f
+ transaction_read_only | Client Connection Defaults / Statement Behavior | f | t | t | f | f
+(3 rows)
+
+-- NO_SHOW_ALL implies NOT_IN_SAMPLE:
+SELECT * FROM pg_settings_flags
+WHERE no_show_all AND NOT not_in_sample
+ORDER BY 1;
+ name | category | no_show_all | no_reset_all | not_in_sample | guc_explain | guc_computed
+------+----------+-------------+--------------+---------------+-------------+--------------
+(0 rows)
+
+DROP TABLE pg_settings_flags;
diff --git a/src/test/regress/expected/rules.out b/src/test/regress/expected/rules.out
index d652f7b5fb4..833c1fab6c7 100644
--- a/src/test/regress/expected/rules.out
+++ b/src/test/regress/expected/rules.out
@@ -1725,7 +1725,7 @@ pg_settings| SELECT a.name,
a.sourcefile,
a.sourceline,
a.pending_restart
- FROM pg_show_all_settings() a(name, setting, unit, category, short_desc, extra_desc, context, vartype, source, min_val, max_val, enumvals, boot_val, reset_val, sourcefile, sourceline, pending_restart);
+ FROM pg_show_all_settings() a(name, setting, unit, category, short_desc, extra_desc, context, vartype, source, min_val, max_val, enumvals, boot_val, reset_val, sourcefile, sourceline, pending_restart, flags);
pg_shadow| SELECT pg_authid.rolname AS usename,
pg_authid.oid AS usesysid,
pg_authid.rolcreatedb AS usecreatedb,
diff --git a/src/test/regress/sql/guc.sql b/src/test/regress/sql/guc.sql
index c39c11388d5..c3898ae690f 100644
--- a/src/test/regress/sql/guc.sql
+++ b/src/test/regress/sql/guc.sql
@@ -311,3 +311,75 @@ reset check_function_bodies;
set default_with_oids to f;
-- Should not allow to set it to true.
set default_with_oids to t;
+
+--
+-- Test GUC categories and flags.
+--
+CREATE TABLE pg_settings_flags AS SELECT name, category,
+ 'NO_SHOW_ALL' =ANY(flags) AS no_show_all,
+ 'NO_RESET_ALL' =ANY(flags) AS no_reset_all,
+ 'NOT_IN_SAMPLE' =ANY(flags) AS not_in_sample,
+ 'EXPLAIN' =ANY(flags) AS guc_explain,
+ 'COMPUTED' =ANY(flags) AS guc_computed
+ FROM pg_show_all_settings();
+
+-- test that GUCS are in postgresql.conf
+SELECT lower(name) FROM pg_settings_flags WHERE NOT not_in_sample EXCEPT
+SELECT regexp_replace(ln, '^#?([_[:alpha:]]+) (= .*|[^ ]*$)', '\1') AS guc
+FROM (SELECT regexp_split_to_table(pg_read_file('postgresql.conf'), '\n') AS ln) conf
+WHERE ln ~ '^#?[[:alpha:]]'
+ORDER BY 1;
+
+-- test that lines in postgresql.conf that look like GUCs are GUCs
+SELECT regexp_replace(ln, '^#?([_[:alpha:]]+) (= .*|[^ ]*$)', '\1') AS guc
+FROM (SELECT regexp_split_to_table(pg_read_file('postgresql.conf'), '\n') AS ln) conf
+WHERE ln ~ '^#?[[:alpha:]]'
+EXCEPT SELECT lower(name) FROM pg_settings_flags WHERE NOT not_in_sample
+ORDER BY 1;
+
+-- test that section:DEVELOPER GUCs are flagged GUC_NOT_IN_SAMPLE:
+SELECT * FROM pg_settings_flags
+WHERE category='Developer Options' AND NOT not_in_sample
+ORDER BY 1;
+
+-- Maybe the converse:
+SELECT * FROM pg_settings_flags
+WHERE category NOT IN ('Developer Options', 'Preset Options') AND not_in_sample
+ORDER BY 1;
+
+-- Most Query Tuning GUCs are flagged as EXPLAIN:
+SELECT * FROM pg_settings_flags
+WHERE category ~ '^Query Tuning' AND NOT guc_explain
+ORDER BY 1;
+
+-- Maybe the converse:
+SELECT * FROM pg_settings_flags
+WHERE guc_explain AND NOT category ~ '^Query Tuning|^Resource Usage'
+ORDER BY 1;
+
+-- GUCs flagged RUNTIME are Preset
+SELECT * FROM pg_settings_flags
+WHERE guc_computed AND NOT category='Preset Options'
+ORDER BY 1;
+
+-- PRESET GUCs are flagged NOT_IN_SAMPLE
+SELECT * FROM pg_settings_flags
+WHERE category='Preset Options' AND NOT not_in_sample
+ORDER BY 1;
+
+-- NO_SHOW_ALL implies NO_RESET_ALL:
+SELECT * FROM pg_settings_flags
+WHERE no_show_all AND NOT no_reset_all
+ORDER BY 1;
+
+-- Usually the converse:
+SELECT * FROM pg_settings_flags
+WHERE NOT no_show_all AND no_reset_all
+ORDER BY 1;
+
+-- NO_SHOW_ALL implies NOT_IN_SAMPLE:
+SELECT * FROM pg_settings_flags
+WHERE no_show_all AND NOT not_in_sample
+ORDER BY 1;
+
+DROP TABLE pg_settings_flags;
--
2.17.1
