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Commit d10e41d

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michaelpqmichaelpq
committed
Introduce pg_settings_get_flags() to find flags associated to a GUC
The most meaningful flags are shown, which are the ones useful for the user and for automating and extending the set of tests supported currently by check_guc. This script may actually be removed in the future, but we are not completely sure yet if and how we want to support the remaining sanity checks performed there, that are now integrated in the main regression test suite as of this commit. Thanks also to Peter Eisentraut and Kyotaro Horiguchi for the discussion. Bump catalog version. Author: Justin Pryzby Discussion: https://postgr.es/m/20211129030833.GJ17618@telsasoft.com
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‎doc/src/sgml/func.sgml

Copy file name to clipboardExpand all lines: doc/src/sgml/func.sgml
+37Lines changed: 37 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -23859,6 +23859,43 @@ SELECT currval(pg_get_serial_sequence('sometable', 'id'));
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</para></entry>
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</row>
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<row>
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<entry role="func_table_entry"><para role="func_signature">
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<indexterm>
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<primary>pg_settings_get_flags</primary>
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</indexterm>
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<function>pg_settings_get_flags</function> ( <parameter>guc</parameter> <type>text</type> )
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<returnvalue>text[]</returnvalue>
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</para>
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<para>
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Returns an array of the flags associated with the given GUC, or
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<literal>NULL</literal> if it does not exist. The result is
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an empty array if the GUC exists but there are no flags to show.
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Only the most useful flags are exposed, as of the following:
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<simplelist>
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<member>
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<literal>EXPLAIN</literal>: parameters included in
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<command>EXPLAIN (SETTINGS)</command> commands.
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</member>
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<member>
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<literal>NO_SHOW_ALL</literal>: parameters excluded from
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<command>SHOW ALL</command> commands.
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</member>
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<member>
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<literal>NO_RESET_ALL</literal>: parameters excluded from
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<command>RESET ALL</command> commands.
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</member>
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<member>
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<literal>NOT_IN_SAMPLE</literal>: parameters not included in
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<filename>postgresql.conf</filename> by default.
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</member>
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<member>
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<literal>RUNTIME_COMPUTED</literal>: runtime-computed parameters.
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</member>
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</simplelist>
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</para></entry>
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</row>
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<row>
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<entry role="func_table_entry"><para role="func_signature">
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<indexterm>

‎src/backend/utils/misc/guc.c

Copy file name to clipboardExpand all lines: src/backend/utils/misc/guc.c
+39Lines changed: 39 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -9634,6 +9634,45 @@ GetConfigOptionByName(const char *name, const char **varname, bool missing_ok)
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return _ShowOption(record, true);
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}
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/*
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* Return some of the flags associated to the specified GUC in the shape of
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* a text array, and NULL if it does not exist. An empty array is returned
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* if the GUC exists without any meaningful flags to show.
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*/
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Datum
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pg_settings_get_flags(PG_FUNCTION_ARGS)
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{
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#define MAX_GUC_FLAGS 5
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char *varname = TextDatumGetCString(PG_GETARG_DATUM(0));
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struct config_generic *record;
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int cnt = 0;
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Datum flags[MAX_GUC_FLAGS];
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ArrayType *a;
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record = find_option(varname, false, true, ERROR);
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/* return NULL if no such variable */
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if (record == NULL)
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PG_RETURN_NULL();
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if (record->flags & GUC_EXPLAIN)
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flags[cnt++] = CStringGetTextDatum("EXPLAIN");
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if (record->flags & GUC_NO_RESET_ALL)
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flags[cnt++] = CStringGetTextDatum("NO_RESET_ALL");
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if (record->flags & GUC_NO_SHOW_ALL)
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flags[cnt++] = CStringGetTextDatum("NO_SHOW_ALL");
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if (record->flags & GUC_NOT_IN_SAMPLE)
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flags[cnt++] = CStringGetTextDatum("NOT_IN_SAMPLE");
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if (record->flags & GUC_RUNTIME_COMPUTED)
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flags[cnt++] = CStringGetTextDatum("RUNTIME_COMPUTED");
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Assert(cnt <= MAX_GUC_FLAGS);
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/* Returns the record as Datum */
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a = construct_array(flags, cnt, TEXTOID, -1, false, TYPALIGN_INT);
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PG_RETURN_ARRAYTYPE_P(a);
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}
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/*
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* Return GUC variable value by variable number; optionally return canonical
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* form of name. Return value is palloc'd.

‎src/include/catalog/catversion.h

Copy file name to clipboardExpand all lines: src/include/catalog/catversion.h
+1-1Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -53,6 +53,6 @@
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*/
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/* yyyymmddN */
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#define CATALOG_VERSION_NO 202201271
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#define CATALOG_VERSION_NO 202201311
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#endif

‎src/include/catalog/pg_proc.dat

Copy file name to clipboardExpand all lines: src/include/catalog/pg_proc.dat
+5Lines changed: 5 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -6096,6 +6096,11 @@
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proargmodes => '{o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o}',
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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}',
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prosrc => 'show_all_settings' },
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{ oid => '8921', descr => 'return flags for specified GUC',
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proname => 'pg_settings_get_flags', provolatile => 's', prorettype => '_text',
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proargtypes => 'text', prosrc => 'pg_settings_get_flags' },
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{ oid => '3329', descr => 'show config file settings',
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proname => 'pg_show_all_file_settings', prorows => '1000', proretset => 't',
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provolatile => 'v', prorettype => 'record', proargtypes => '',

‎src/test/regress/expected/guc.out

Copy file name to clipboardExpand all lines: src/test/regress/expected/guc.out
+83Lines changed: 83 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -813,3 +813,86 @@ set default_with_oids to f;
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-- Should not allow to set it to true.
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set default_with_oids to t;
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ERROR: tables declared WITH OIDS are not supported
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-- Test GUC categories and flag patterns
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SELECT pg_settings_get_flags(NULL);
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pg_settings_get_flags
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-----------------------
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(1 row)
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SELECT pg_settings_get_flags('does_not_exist');
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pg_settings_get_flags
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-----------------------
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(1 row)
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CREATE TABLE tab_settings_flags AS SELECT name, category,
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'EXPLAIN' = ANY(flags) AS explain,
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'NO_RESET_ALL' = ANY(flags) AS no_reset_all,
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'NO_SHOW_ALL' = ANY(flags) AS no_show_all,
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'NOT_IN_SAMPLE' = ANY(flags) AS not_in_sample,
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'RUNTIME_COMPUTED' = ANY(flags) AS runtime_computed
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FROM pg_show_all_settings() AS psas,
836+
pg_settings_get_flags(psas.name) AS flags;
837+
-- Developer GUCs should be flagged with GUC_NOT_IN_SAMPLE:
838+
SELECT name FROM tab_settings_flags
839+
WHERE category = 'Developer Options' AND NOT not_in_sample
840+
ORDER BY 1;
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name
842+
------
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(0 rows)
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-- Most query-tuning GUCs are flagged as valid for EXPLAIN.
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-- default_statistics_target is an exception.
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SELECT name FROM tab_settings_flags
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WHERE category ~ '^Query Tuning' AND NOT explain
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ORDER BY 1;
850+
name
851+
---------------------------
852+
default_statistics_target
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(1 row)
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-- Runtime-computed GUCs should be part of the preset category.
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SELECT name FROM tab_settings_flags
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WHERE NOT category = 'Preset Options' AND runtime_computed
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ORDER BY 1;
859+
name
860+
------
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(0 rows)
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-- Preset GUCs are flagged as NOT_IN_SAMPLE.
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SELECT name FROM tab_settings_flags
865+
WHERE category = 'Preset Options' AND NOT not_in_sample
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ORDER BY 1;
867+
name
868+
------
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(0 rows)
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-- NO_SHOW_ALL implies NO_RESET_ALL, and vice-versa.
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SELECT name FROM tab_settings_flags
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WHERE no_show_all AND NOT no_reset_all
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ORDER BY 1;
875+
name
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------
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(0 rows)
878+
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-- Exceptions are transaction_*.
880+
SELECT name FROM tab_settings_flags
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WHERE NOT no_show_all AND no_reset_all
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ORDER BY 1;
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name
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------------------------
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transaction_deferrable
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transaction_isolation
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transaction_read_only
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(3 rows)
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890+
-- NO_SHOW_ALL implies NOT_IN_SAMPLE.
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SELECT name FROM tab_settings_flags
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WHERE no_show_all AND NOT not_in_sample
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ORDER BY 1;
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name
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------
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(0 rows)
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DROP TABLE tab_settings_flags;

‎src/test/regress/sql/guc.sql

Copy file name to clipboardExpand all lines: src/test/regress/sql/guc.sql
+43Lines changed: 43 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -311,3 +311,46 @@ reset check_function_bodies;
311311
set default_with_oids to f;
312312
-- Should not allow to set it to true.
313313
set default_with_oids to t;
314+
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-- Test GUC categories and flag patterns
316+
SELECT pg_settings_get_flags(NULL);
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SELECT pg_settings_get_flags('does_not_exist');
318+
CREATE TABLE tab_settings_flags AS SELECT name, category,
319+
'EXPLAIN' = ANY(flags) AS explain,
320+
'NO_RESET_ALL' = ANY(flags) AS no_reset_all,
321+
'NO_SHOW_ALL' = ANY(flags) AS no_show_all,
322+
'NOT_IN_SAMPLE' = ANY(flags) AS not_in_sample,
323+
'RUNTIME_COMPUTED' = ANY(flags) AS runtime_computed
324+
FROM pg_show_all_settings() AS psas,
325+
pg_settings_get_flags(psas.name) AS flags;
326+
327+
-- Developer GUCs should be flagged with GUC_NOT_IN_SAMPLE:
328+
SELECT name FROM tab_settings_flags
329+
WHERE category = 'Developer Options' AND NOT not_in_sample
330+
ORDER BY 1;
331+
-- Most query-tuning GUCs are flagged as valid for EXPLAIN.
332+
-- default_statistics_target is an exception.
333+
SELECT name FROM tab_settings_flags
334+
WHERE category ~ '^Query Tuning' AND NOT explain
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ORDER BY 1;
336+
-- Runtime-computed GUCs should be part of the preset category.
337+
SELECT name FROM tab_settings_flags
338+
WHERE NOT category = 'Preset Options' AND runtime_computed
339+
ORDER BY 1;
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-- Preset GUCs are flagged as NOT_IN_SAMPLE.
341+
SELECT name FROM tab_settings_flags
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WHERE category = 'Preset Options' AND NOT not_in_sample
343+
ORDER BY 1;
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-- NO_SHOW_ALL implies NO_RESET_ALL, and vice-versa.
345+
SELECT name FROM tab_settings_flags
346+
WHERE no_show_all AND NOT no_reset_all
347+
ORDER BY 1;
348+
-- Exceptions are transaction_*.
349+
SELECT name FROM tab_settings_flags
350+
WHERE NOT no_show_all AND no_reset_all
351+
ORDER BY 1;
352+
-- NO_SHOW_ALL implies NOT_IN_SAMPLE.
353+
SELECT name FROM tab_settings_flags
354+
WHERE no_show_all AND NOT not_in_sample
355+
ORDER BY 1;
356+
DROP TABLE tab_settings_flags;

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