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Make the name optional in CREATE STATISTICS. 

This allows users to omit the statistics name in a CREATE STATISTICS
command, letting the system auto-generate a sensible, unique name,
putting the statistics object in the same schema as the table.

Simon Riggs, reviewed by Matthias van de Meent.

Discussion: https://postgr.es/m/CANbhV-FGD2d_C3zFTfT2aRfX_TaPSgOeKES58RLZx5XzQp5NhA@mail.gmail.com
This commit is contained in:
Dean Rasheed 2022-07-21 19:23:13 +01:00
parent fa6c230ef2
commit 624aa2a13b
5 changed files with 86 additions and 53 deletions
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12
doc/src/sgml/ref/create_statistics.sgml
View File

@ -21,11 +21,11 @@ PostgreSQL documentation
<refsynopsisdiv>
<synopsis>
CREATE STATISTICS [ IF NOT EXISTS ] <replaceable class="parameter">statistics_name</replaceable>
CREATE STATISTICS [ [ IF NOT EXISTS ] <replaceable class="parameter">statistics_name</replaceable> ]
ON ( <replaceable class="parameter">expression</replaceable> )
FROM <replaceable class="parameter">table_name</replaceable>
CREATE STATISTICS [ IF NOT EXISTS ] <replaceable class="parameter">statistics_name</replaceable>
CREATE STATISTICS [ [ IF NOT EXISTS ] <replaceable class="parameter">statistics_name</replaceable> ]
[ ( <replaceable class="parameter">statistics_kind</replaceable> [, ... ] ) ]
ON { <replaceable class="parameter">column_name</replaceable> | ( <replaceable class="parameter">expression</replaceable> ) }, { <replaceable class="parameter">column_name</replaceable> | ( <replaceable class="parameter">expression</replaceable> ) } [, ...]
FROM <replaceable class="parameter">table_name</replaceable>
@ -60,8 +60,8 @@ CREATE STATISTICS [ IF NOT EXISTS ] <replaceable class="parameter">statistics_na
If a schema name is given (for example, <literal>CREATE STATISTICS
myschema.mystat ...</literal>) then the statistics object is created in the
specified schema. Otherwise it is created in the current schema.
The name of the statistics object must be distinct from the name of any
other statistics object in the same schema.
If given, the name of the statistics object must be distinct from the name
of any other statistics object in the same schema.
</para>
</refsect1>
@ -78,6 +78,7 @@ CREATE STATISTICS [ IF NOT EXISTS ] <replaceable class="parameter">statistics_na
exists. A notice is issued in this case. Note that only the name of
the statistics object is considered here, not the details of its
definition.
Statistics name is required when <literal>IF NOT EXISTS</literal> is specified.
</para>
</listitem>
</varlistentry>
@ -88,6 +89,9 @@ CREATE STATISTICS [ IF NOT EXISTS ] <replaceable class="parameter">statistics_na
<para>
The name (optionally schema-qualified) of the statistics object to be
created.
If the name is omitted, <productname>PostgreSQL</productname> chooses a
suitable name based on the parent table's name and the defined column
name(s) and/or expression(s).
</para>
</listitem>
</varlistentry>

7
src/backend/commands/statscmds.c
View File

@ -155,10 +155,9 @@ CreateStatistics(CreateStatsStmt *stmt)
/*
* If the node has a name, split it up and determine creation namespace.
* If not (a possibility not considered by the grammar, but one which can
* occur via the "CREATE TABLE ... (LIKE)" command), then we put the
* object in the same namespace as the relation, and cons up a name for
* it.
* If not, put the object in the same namespace as the relation, and cons
* up a name for it. (This can happen either via "CREATE STATISTICS ..."
* or via "CREATE TABLE ... (LIKE)".)
*/
if (stmt->defnames)
namespaceId = QualifiedNameGetCreationNamespace(stmt->defnames,

13
src/backend/parser/gram.y
View File

@ -434,7 +434,8 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
old_aggr_definition old_aggr_list
oper_argtypes RuleActionList RuleActionMulti
opt_column_list columnList opt_name_list
sort_clause opt_sort_clause sortby_list index_params stats_params
sort_clause opt_sort_clause sortby_list index_params
opt_stats_name stats_params
opt_include opt_c_include index_including_params
name_list role_list from_clause from_list opt_array_bounds
qualified_name_list any_name any_name_list type_name_list
@ -4533,7 +4534,7 @@ ExistingIndex: USING INDEX name { $$ = $3; }
/*****************************************************************************
*
* QUERY :
* CREATE STATISTICS [IF NOT EXISTS] stats_name [(stat types)]
* CREATE STATISTICS [[IF NOT EXISTS] stats_name] [(stat types)]
* ON expression-list FROM from_list
*
* Note: the expectation here is that the clauses after ON are a subset of
@ -4545,7 +4546,7 @@ ExistingIndex: USING INDEX name { $$ = $3; }
*****************************************************************************/
CreateStatsStmt:
CREATE STATISTICS any_name
CREATE STATISTICS opt_stats_name
opt_name_list ON stats_params FROM from_list
{
CreateStatsStmt *n = makeNode(CreateStatsStmt);
@ -4573,6 +4574,12 @@ CreateStatsStmt:
}
;
/* Statistics name is optional unless IF NOT EXISTS is specified */
opt_stats_name:
any_name { $$ = $1; }
| /*EMPTY*/ { $$ = NULL; }
;
/*
* Statistics attributes can be either simple column references, or arbitrary
* expressions in parens. For compatibility with index attributes permitted

87
src/test/regress/expected/stats_ext.out
View File

@ -3062,11 +3062,11 @@ 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 statistics (ndistinct) on a, b from stts_t1;
create statistics (ndistinct, dependencies) on a, b from stts_t1;
create statistics (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 statistics 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;
@ -3084,24 +3084,24 @@ set search_path to public, stts_s1, stts_s2, tststats;
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
public | stts_t1_a_b_stat | a, b FROM stts_t1 | defined | |
public | stts_t1_a_b_stat1 | a, b FROM stts_t1 | defined | defined |
public | stts_t1_a_b_stat2 | a, b FROM stts_t1 | defined | defined | defined
public | stts_t2_b_c_stat | b, c FROM stts_t2 | 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 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
\dX stts_t*
List of extended statistics
Schema | Name | Definition | Ndistinct | Dependencies | MCV
--------+-------------------+-------------------+-----------+--------------+---------
public | stts_t1_a_b_stat | a, b FROM stts_t1 | defined | |
public | stts_t1_a_b_stat1 | a, b FROM stts_t1 | defined | defined |
public | stts_t1_a_b_stat2 | a, b FROM stts_t1 | defined | defined | defined
public | stts_t2_b_c_stat | b, c FROM stts_t2 | defined | defined | defined
(4 rows)
\dX *stts_hoge
@ -3119,24 +3119,24 @@ set search_path to public, stts_s1, stts_s2, tststats;
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
public | stts_t1_a_b_stat | a, b FROM stts_t1 | defined | |
public | stts_t1_a_b_stat1 | a, b FROM stts_t1 | defined | defined |
public | stts_t1_a_b_stat2 | a, b FROM stts_t1 | defined | defined | defined
public | stts_t2_b_c_stat | b, c FROM stts_t2 | 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 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
\dX+ stts_t*
List of extended statistics
Schema | Name | Definition | Ndistinct | Dependencies | MCV
--------+-------------------+-------------------+-----------+--------------+---------
public | stts_t1_a_b_stat | a, b FROM stts_t1 | defined | |
public | stts_t1_a_b_stat1 | a, b FROM stts_t1 | defined | defined |
public | stts_t1_a_b_stat2 | a, b FROM stts_t1 | defined | defined | defined
public | stts_t2_b_c_stat | b, c FROM stts_t2 | defined | defined | defined
(4 rows)
\dX+ *stts_hoge
@ -3153,6 +3153,21 @@ set search_path to public, stts_s1, stts_s2, tststats;
stts_s2 | stts_yama | col1, col3 FROM stts_t3 | | defined | defined
(1 row)
create statistics (mcv) ON a, b, (a+b), (a-b) FROM stts_t1;
create statistics (mcv) ON a, b, (a+b), (a-b) FROM stts_t1;
create statistics (mcv) ON (a+b), (a-b) FROM stts_t1;
\dX stts_t*expr*
List of extended statistics
Schema | Name | Definition | Ndistinct | Dependencies | MCV
--------+-----------------------------+-------------------------------------+-----------+--------------+---------
public | stts_t1_a_b_expr_expr_stat | a, b, (a + b), (a - b) FROM stts_t1 | | | defined
public | stts_t1_a_b_expr_expr_stat1 | a, b, (a + b), (a - b) FROM stts_t1 | | | defined
public | stts_t1_expr_expr_stat | (a + b), (a - b) FROM stts_t1 | | | defined
(3 rows)
drop statistics stts_t1_a_b_expr_expr_stat;
drop statistics stts_t1_a_b_expr_expr_stat1;
drop statistics stts_t1_expr_expr_stat;
set search_path to public, stts_s1;
\dX
List of extended statistics
@ -3162,11 +3177,11 @@ set search_path to public, stts_s1;
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
public | stts_t1_a_b_stat | a, b FROM stts_t1 | defined | |
public | stts_t1_a_b_stat1 | a, b FROM stts_t1 | defined | defined |
public | stts_t1_a_b_stat2 | a, b FROM stts_t1 | defined | defined | defined
public | stts_t2_b_c_stat | b, c FROM stts_t2 | defined | defined | defined
stts_s1 | stts_foo | col1, col2 FROM stts_t3 | defined | defined | defined
(10 rows)
@ -3180,11 +3195,11 @@ set role regress_stats_ext;
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
public | stts_t1_a_b_stat | a, b FROM stts_t1 | defined | |
public | stts_t1_a_b_stat1 | a, b FROM stts_t1 | defined | defined |
public | stts_t1_a_b_stat2 | a, b FROM stts_t1 | defined | defined | defined
public | stts_t2_b_c_stat | b, c FROM stts_t2 | defined | defined | defined
(9 rows)
reset role;

20
src/test/regress/sql/stats_ext.sql
View File

@ -1555,12 +1555,12 @@ 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 statistics (ndistinct) on a, b from stts_t1;
create statistics (ndistinct, dependencies) on a, b from stts_t1;
create statistics (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 statistics 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;
@ -1575,13 +1575,21 @@ analyze stts_t1;
set search_path to public, stts_s1, stts_s2, tststats;
\dX
\dX stts_?
\dX stts_t*
\dX *stts_hoge
\dX+
\dX+ stts_?
\dX+ stts_t*
\dX+ *stts_hoge
\dX+ stts_s2.stts_yama
create statistics (mcv) ON a, b, (a+b), (a-b) FROM stts_t1;
create statistics (mcv) ON a, b, (a+b), (a-b) FROM stts_t1;
create statistics (mcv) ON (a+b), (a-b) FROM stts_t1;
\dX stts_t*expr*
drop statistics stts_t1_a_b_expr_expr_stat;
drop statistics stts_t1_a_b_expr_expr_stat1;
drop statistics stts_t1_expr_expr_stat;
set search_path to public, stts_s1;
\dX