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psql \dX: list extended statistics objects

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The new command lists extended statistics objects. All past releases
with extended statistics are supported.

This is a simplified version of commit 891a1d0bca, which had to be
reverted due to not considering pg_statistic_ext_data is not accessible
by regular users. Fields requiring access to this catalog were removed.
It's possible to add them, but it'll require changes to core.

Author: Tatsuro Yamada
Reviewed-by: Julien Rouhaud, Alvaro Herrera, Tomas Vondra, Noriyoshi Shinoda
Discussion: https://postgr.es/m/c027a541-5856-75a5-0868-341301e1624b%40nttcom.co.jp_1
This commit is contained in:
Tomas Vondra 2021-01-20 22:56:06 +01:00
parent 9d23c15a03
commit ad600bba04
8 changed files with 267 additions and 1 deletions
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21
doc/src/sgml/ref/psql-ref.sgml
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@ -1919,6 +1919,27 @@ testdb=>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>\dX [ <link linkend="app-psql-patterns"><replaceable class="parameter">pattern</replaceable></link> ]</literal></term>
<listitem>
<para>
Lists extended statistics.
If <replaceable class="parameter">pattern</replaceable>
is specified, only those extended statistics whose names match the
pattern are listed.
</para>
<para>
The column of the kind of extended stats (e.g. Ndistinct) shows its status.
NULL means that it doesn't exists. "defined" means that it was requested
when creating the statistics.
You can use pg_stats_ext if you'd like to know whether <link linkend="sql-analyze">
<command>ANALYZE</command></link> was run and statistics are available to the
planner.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>\dy[+] [ <link linkend="app-psql-patterns"><replaceable class="parameter">pattern</replaceable></link> ]</literal></term>
<listitem>

3
src/bin/psql/command.c
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@ -928,6 +928,9 @@ exec_command_d(PsqlScanState scan_state, bool active_branch, const char *cmd)
else
success = listExtensions(pattern);
break;
case 'X': /* Extended Statistics */
success = listExtendedStats(pattern);
break;
case 'y': /* Event Triggers */
success = listEventTriggers(pattern, show_verbose);
break;

83
src/bin/psql/describe.c
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@ -4392,6 +4392,89 @@ listEventTriggers(const char *pattern, bool verbose)
return true;
}
/*
* \dX
*
* Describes extended statistics.
*/
bool
listExtendedStats(const char *pattern)
{
PQExpBufferData buf;
PGresult *res;
printQueryOpt myopt = pset.popt;
if (pset.sversion < 100000)
{
char sverbuf[32];
pg_log_error("The server (version %s) does not support extended statistics.",
formatPGVersionNumber(pset.sversion, false,
sverbuf, sizeof(sverbuf)));
return true;
}
initPQExpBuffer(&buf);
printfPQExpBuffer(&buf,
"SELECT \n"
"es.stxnamespace::pg_catalog.regnamespace::text AS \"%s\", \n"
"es.stxname AS \"%s\", \n"
"pg_catalog.format('%%s FROM %%s', \n"
" (SELECT pg_catalog.string_agg(pg_catalog.quote_ident(a.attname),', ') \n"
" FROM pg_catalog.unnest(es.stxkeys) s(attnum) \n"
" JOIN pg_catalog.pg_attribute a \n"
" ON (es.stxrelid = a.attrelid \n"
" AND a.attnum = s.attnum \n"
" AND NOT a.attisdropped)), \n"
"es.stxrelid::regclass) AS \"%s\"",
gettext_noop("Schema"),
gettext_noop("Name"),
gettext_noop("Definition"));
appendPQExpBuffer(&buf,
",\nCASE WHEN 'd' = any(es.stxkind) THEN 'defined' \n"
"END AS \"%s\", \n"
"CASE WHEN 'f' = any(es.stxkind) THEN 'defined' \n"
"END AS \"%s\"",
gettext_noop("Ndistinct"),
gettext_noop("Dependencies"));
/*
* Include the MCV statistics kind.
*/
if (pset.sversion >= 120000)
{
appendPQExpBuffer(&buf,
",\nCASE WHEN 'm' = any(es.stxkind) THEN 'defined' \n"
"END AS \"%s\" ",
gettext_noop("MCV"));
}
appendPQExpBufferStr(&buf,
" \nFROM pg_catalog.pg_statistic_ext es \n");
processSQLNamePattern(pset.db, &buf, pattern,
false, false,
"es.stxnamespace::pg_catalog.regnamespace::text", "es.stxname",
NULL, NULL);
appendPQExpBufferStr(&buf, "ORDER BY 1, 2;");
res = PSQLexec(buf.data);
termPQExpBuffer(&buf);
if (!res)
return false;
myopt.nullPrint = NULL;
myopt.title = _("List of extended statistics");
myopt.translate_header = true;
printQuery(res, &myopt, pset.queryFout, false, pset.logfile);
PQclear(res);
return true;
}
/*
* \dC
*

3
src/bin/psql/describe.h
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@ -102,6 +102,9 @@ extern bool listExtensions(const char *pattern);
/* \dx+ */
extern bool listExtensionContents(const char *pattern);
/* \dX */
extern bool listExtendedStats(const char *pattern);
/* \dy */
extern bool listEventTriggers(const char *pattern, bool verbose);

1
src/bin/psql/help.c
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@ -267,6 +267,7 @@ slashUsage(unsigned short int pager)
fprintf(output, _(" \\du[S+] [PATTERN] list roles\n"));
fprintf(output, _(" \\dv[S+] [PATTERN] list views\n"));
fprintf(output, _(" \\dx[+] [PATTERN] list extensions\n"));
fprintf(output, _(" \\dX [PATTERN] list extended statistics\n"));
fprintf(output, _(" \\dy [PATTERN] list event triggers\n"));
fprintf(output, _(" \\l[+] [PATTERN] list databases\n"));
fprintf(output, _(" \\sf[+] FUNCNAME show a function's definition\n"));

4
src/bin/psql/tab-complete.c
View File

@ -1505,7 +1505,7 @@ psql_completion(const char *text, int start, int end)
"\\dF", "\\dFd", "\\dFp", "\\dFt", "\\dg", "\\di", "\\dl", "\\dL",
"\\dm", "\\dn", "\\do", "\\dO", "\\dp", "\\dP", "\\dPi", "\\dPt",
"\\drds", "\\dRs", "\\dRp", "\\ds", "\\dS",
"\\dt", "\\dT", "\\dv", "\\du", "\\dx", "\\dy",
"\\dt", "\\dT", "\\dv", "\\du", "\\dx", "\\dX", "\\dy",
"\\e", "\\echo", "\\ef", "\\elif", "\\else", "\\encoding",
"\\endif", "\\errverbose", "\\ev",
"\\f",
@ -3974,6 +3974,8 @@ psql_completion(const char *text, int start, int end)
COMPLETE_WITH_SCHEMA_QUERY(Query_for_list_of_views, NULL);
else if (TailMatchesCS("\\dx*"))
COMPLETE_WITH_QUERY(Query_for_list_of_extensions);
else if (TailMatchesCS("\\dX*"))
COMPLETE_WITH_SCHEMA_QUERY(Query_for_list_of_statistics, NULL);
else if (TailMatchesCS("\\dm*"))
COMPLETE_WITH_SCHEMA_QUERY(Query_for_list_of_matviews, NULL);
else if (TailMatchesCS("\\dE*"))

116
src/test/regress/expected/stats_ext.out
View File

@ -1727,6 +1727,122 @@ INSERT INTO tststats.priv_test_tbl
CREATE STATISTICS tststats.priv_test_stats (mcv) ON a, b
FROM tststats.priv_test_tbl;
ANALYZE tststats.priv_test_tbl;
-- Check printing info about extended statistics by \dX
create table stts_t1 (a int, b int);
create statistics stts_1 (ndistinct) on a, b from stts_t1;
create statistics stts_2 (ndistinct, dependencies) on a, b from stts_t1;
create statistics stts_3 (ndistinct, dependencies, mcv) on a, b from stts_t1;
create table stts_t2 (a int, b int, c int);
create statistics stts_4 on b, c from stts_t2;
create table stts_t3 (col1 int, col2 int, col3 int);
create statistics stts_hoge on col1, col2, col3 from stts_t3;
create schema stts_s1;
create schema stts_s2;
create statistics stts_s1.stts_foo on col1, col2 from stts_t3;
create statistics stts_s2.stts_yama (dependencies, mcv) on col1, col3 from stts_t3;
insert into stts_t1 select i,i from generate_series(1,100) i;
analyze stts_t1;
\dX
List of extended statistics
Schema | Name | Definition | Ndistinct | Dependencies | MCV
----------+------------------------+--------------------------------------+-----------+--------------+---------
public | func_deps_stat | a, b, c FROM functional_dependencies | | defined |
public | mcv_lists_arrays_stats | a, b, c FROM mcv_lists_arrays | | | defined
public | mcv_lists_bool_stats | a, b, c FROM mcv_lists_bool | | | defined
public | mcv_lists_stats | a, b, d FROM mcv_lists | | | defined
public | stts_1 | a, b FROM stts_t1 | defined | |
public | stts_2 | a, b FROM stts_t1 | defined | defined |
public | stts_3 | a, b FROM stts_t1 | defined | defined | defined
public | stts_4 | b, c FROM stts_t2 | defined | defined | defined
public | stts_hoge | col1, col2, col3 FROM stts_t3 | defined | defined | defined
stts_s1 | stts_foo | col1, col2 FROM stts_t3 | defined | defined | defined
stts_s2 | stts_yama | col1, col3 FROM stts_t3 | | defined | defined
tststats | priv_test_stats | a, b FROM tststats.priv_test_tbl | | | defined
(12 rows)
\dX stts_?
List of extended statistics
Schema | Name | Definition | Ndistinct | Dependencies | MCV
--------+--------+-------------------+-----------+--------------+---------
public | stts_1 | a, b FROM stts_t1 | defined | |
public | stts_2 | a, b FROM stts_t1 | defined | defined |
public | stts_3 | a, b FROM stts_t1 | defined | defined | defined
public | stts_4 | b, c FROM stts_t2 | defined | defined | defined
(4 rows)
\dX *stts_hoge
List of extended statistics
Schema | Name | Definition | Ndistinct | Dependencies | MCV
--------+-----------+-------------------------------+-----------+--------------+---------
public | stts_hoge | col1, col2, col3 FROM stts_t3 | defined | defined | defined
(1 row)
\dX+
List of extended statistics
Schema | Name | Definition | Ndistinct | Dependencies | MCV
----------+------------------------+--------------------------------------+-----------+--------------+---------
public | func_deps_stat | a, b, c FROM functional_dependencies | | defined |
public | mcv_lists_arrays_stats | a, b, c FROM mcv_lists_arrays | | | defined
public | mcv_lists_bool_stats | a, b, c FROM mcv_lists_bool | | | defined
public | mcv_lists_stats | a, b, d FROM mcv_lists | | | defined
public | stts_1 | a, b FROM stts_t1 | defined | |
public | stts_2 | a, b FROM stts_t1 | defined | defined |
public | stts_3 | a, b FROM stts_t1 | defined | defined | defined
public | stts_4 | b, c FROM stts_t2 | defined | defined | defined
public | stts_hoge | col1, col2, col3 FROM stts_t3 | defined | defined | defined
stts_s1 | stts_foo | col1, col2 FROM stts_t3 | defined | defined | defined
stts_s2 | stts_yama | col1, col3 FROM stts_t3 | | defined | defined
tststats | priv_test_stats | a, b FROM tststats.priv_test_tbl | | | defined
(12 rows)
\dX+ stts_?
List of extended statistics
Schema | Name | Definition | Ndistinct | Dependencies | MCV
--------+--------+-------------------+-----------+--------------+---------
public | stts_1 | a, b FROM stts_t1 | defined | |
public | stts_2 | a, b FROM stts_t1 | defined | defined |
public | stts_3 | a, b FROM stts_t1 | defined | defined | defined
public | stts_4 | b, c FROM stts_t2 | defined | defined | defined
(4 rows)
\dX+ *stts_hoge
List of extended statistics
Schema | Name | Definition | Ndistinct | Dependencies | MCV
--------+-----------+-------------------------------+-----------+--------------+---------
public | stts_hoge | col1, col2, col3 FROM stts_t3 | defined | defined | defined
(1 row)
\dX+ stts_s2.stts_yama
List of extended statistics
Schema | Name | Definition | Ndistinct | Dependencies | MCV
---------+-----------+-------------------------+-----------+--------------+---------
stts_s2 | stts_yama | col1, col3 FROM stts_t3 | | defined | defined
(1 row)
create role regress_stats_ext nosuperuser;
set role regress_stats_ext;
\dX
List of extended statistics
Schema | Name | Definition | Ndistinct | Dependencies | MCV
----------+------------------------+--------------------------------------+-----------+--------------+---------
public | func_deps_stat | a, b, c FROM functional_dependencies | | defined |
public | mcv_lists_arrays_stats | a, b, c FROM mcv_lists_arrays | | | defined
public | mcv_lists_bool_stats | a, b, c FROM mcv_lists_bool | | | defined
public | mcv_lists_stats | a, b, d FROM mcv_lists | | | defined
public | stts_1 | a, b FROM stts_t1 | defined | |
public | stts_2 | a, b FROM stts_t1 | defined | defined |
public | stts_3 | a, b FROM stts_t1 | defined | defined | defined
public | stts_4 | b, c FROM stts_t2 | defined | defined | defined
public | stts_hoge | col1, col2, col3 FROM stts_t3 | defined | defined | defined
stts_s1 | stts_foo | col1, col2 FROM stts_t3 | defined | defined | defined
stts_s2 | stts_yama | col1, col3 FROM stts_t3 | | defined | defined
tststats | priv_test_stats | a, b FROM tststats.priv_test_tbl | | | defined
(12 rows)
reset role;
drop table stts_t1, stts_t2, stts_t3;
drop schema stts_s1, stts_s2 cascade;
drop user regress_stats_ext;
-- User with no access
CREATE USER regress_stats_user1;
GRANT USAGE ON SCHEMA tststats TO regress_stats_user1;

37
src/test/regress/sql/stats_ext.sql
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@ -914,6 +914,43 @@ CREATE STATISTICS tststats.priv_test_stats (mcv) ON a, b
ANALYZE tststats.priv_test_tbl;
-- Check printing info about extended statistics by \dX
create table stts_t1 (a int, b int);
create statistics stts_1 (ndistinct) on a, b from stts_t1;
create statistics stts_2 (ndistinct, dependencies) on a, b from stts_t1;
create statistics stts_3 (ndistinct, dependencies, mcv) on a, b from stts_t1;
create table stts_t2 (a int, b int, c int);
create statistics stts_4 on b, c from stts_t2;
create table stts_t3 (col1 int, col2 int, col3 int);
create statistics stts_hoge on col1, col2, col3 from stts_t3;
create schema stts_s1;
create schema stts_s2;
create statistics stts_s1.stts_foo on col1, col2 from stts_t3;
create statistics stts_s2.stts_yama (dependencies, mcv) on col1, col3 from stts_t3;
insert into stts_t1 select i,i from generate_series(1,100) i;
analyze stts_t1;
\dX
\dX stts_?
\dX *stts_hoge
\dX+
\dX+ stts_?
\dX+ *stts_hoge
\dX+ stts_s2.stts_yama
create role regress_stats_ext nosuperuser;
set role regress_stats_ext;
\dX
reset role;
drop table stts_t1, stts_t2, stts_t3;
drop schema stts_s1, stts_s2 cascade;
drop user regress_stats_ext;
-- User with no access
CREATE USER regress_stats_user1;
GRANT USAGE ON SCHEMA tststats TO regress_stats_user1;