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Routine usage information schema tables

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Several information schema views track dependencies between
functions/procedures and objects used by them.  These had not been
implemented so far because PostgreSQL doesn't track objects used in a
function body.  However, formally, these also show dependencies used
in parameter default expressions, which PostgreSQL does support and
track.  So for the sake of completeness, we might as well add these.
If dependency tracking for function bodies is ever implemented, these
views will automatically work correctly.

Reviewed-by: Erik Rijkers <er@xs4all.nl>
Discussion: https://www.postgresql.org/message-id/flat/ac80fc74-e387-8950-9a31-2560778fc1e3%40enterprisedb.com
pull/61/head
Peter Eisentraut 4 years ago
parent a29f30780f
commit f40c6969d0
6 changed files with 603 additions and 6 deletions
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  1. 443
      doc/src/sgml/information_schema.sgml
  2. 100
      src/backend/catalog/information_schema.sql
  3. 2
      src/backend/catalog/sql_features.txt
  4. 2
      src/include/catalog/catversion.h
  5. 38
      src/test/regress/expected/create_function_3.out
  6. 24
      src/test/regress/sql/create_function_3.sql

443
doc/src/sgml/information_schema.sgml
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@ -4841,6 +4841,126 @@ ORDER BY c.ordinal_position;
</table>
</sect1>
<sect1 id="infoschema-routine-column-usage">
<title><literal>routine_column_usage</literal></title>
<para>
The view <literal>routine_column_usage</literal> is meant to identify all
columns that are used by a function or procedure. This information is
currently not tracked by <productname>PostgreSQL</productname>.
</para>
<table>
<title><literal>routine_column_usage</literal> Columns</title>
<tgroup cols="1">
<thead>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
Column Type
</para>
<para>
Description
</para></entry>
</row>
</thead>
<tbody>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>specific_catalog</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the database containing the function (always the current database)
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>specific_schema</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the schema containing the function
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>specific_name</structfield> <type>sql_identifier</type>
</para>
<para>
The <quote>specific name</quote> of the function. See <xref linkend="infoschema-routines"/> for more information.
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>routine_catalog</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the database containing the function (always the current database)
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>routine_schema</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the schema containing the function
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>routine_name</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the function (might be duplicated in case of overloading)
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>table_catalog</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the database that contains the table that is used by the
function (always the current database)
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>table_schema</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the schema that contains the table that is used by the function
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>table_name</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the table that is used by the function
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>column_name</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the column that is used by the function
</para></entry>
</row>
</tbody>
</tgroup>
</table>
</sect1>
<sect1 id="infoschema-routine-privileges">
<title><literal>routine_privileges</literal></title>
@ -4960,6 +5080,329 @@ ORDER BY c.ordinal_position;
</table>
</sect1>
<sect1 id="infoschema-routine-routine-usage">
<title><literal>routine_routine_usage</literal></title>
<para>
The view <literal>routine_routine_usage</literal> is meant to identify all
functions or procedures that are used by another (or the same) function or
procedure, either in the body or in parameter default expressions.
Currently, only functions used in parameter default expressions are
tracked. An entry is included here only if the used function is owned by a
currently enabled role. (There is no such restriction on the using
function.)
</para>
<para>
Note that the entries for both functions in the view refer to the
<quote>specific</quote> name of the routine, even though the column names
are used in a way that is inconsistent with other information schema views
about routines. This is per SQL standard, although it is arguably a
misdesign. See <xref linkend="infoschema-routines"/> for more information
about specific names.
</para>
<table>
<title><literal>routine_routine_usage</literal> Columns</title>
<tgroup cols="1">
<thead>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
Column Type
</para>
<para>
Description
</para></entry>
</row>
</thead>
<tbody>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>specific_catalog</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the database containing the using function (always the current database)
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>specific_schema</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the schema containing the using function
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>specific_name</structfield> <type>sql_identifier</type>
</para>
<para>
The <quote>specific name</quote> of the using function.
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>routine_catalog</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the database that contains the function that is used by the
first function (always the current database)
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>routine_schema</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the schema that contains the function that is used by the first
function
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>routine_name</structfield> <type>sql_identifier</type>
</para>
<para>
The <quote>specific name</quote> of the function that is used by the
first function.
</para></entry>
</row>
</tbody>
</tgroup>
</table>
</sect1>
<sect1 id="infoschema-routine-sequence-usage">
<title><literal>routine_sequence_usage</literal></title>
<para>
The view <literal>routine_sequence_usage</literal> is meant to identify all
sequences that are used by a function or procedure, either in the body or
in parameter default expressions. Currently, only sequences used in
parameter default expressions are tracked. A sequence is only included if
that sequence is owned by a currently enabled role.
</para>
<table>
<title><literal>routine_sequence_usage</literal> Columns</title>
<tgroup cols="1">
<thead>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
Column Type
</para>
<para>
Description
</para></entry>
</row>
</thead>
<tbody>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>specific_catalog</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the database containing the function (always the current database)
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>specific_schema</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the schema containing the function
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>specific_name</structfield> <type>sql_identifier</type>
</para>
<para>
The <quote>specific name</quote> of the function. See <xref linkend="infoschema-routines"/> for more information.
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>routine_catalog</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the database containing the function (always the current database)
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>routine_schema</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the schema containing the function
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>routine_name</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the function (might be duplicated in case of overloading)
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>schema_catalog</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the database that contains the sequence that is used by the
function (always the current database)
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>sequence_schema</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the schema that contains the sequence that is used by the function
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>sequence_name</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the sequence that is used by the function
</para></entry>
</row>
</tbody>
</tgroup>
</table>
</sect1>
<sect1 id="infoschema-routine-table-usage">
<title><literal>routine_table_usage</literal></title>
<para>
The view <literal>routine_table_usage</literal> is meant to identify all
tables that are used by a function or procedure. This information is
currently not tracked by <productname>PostgreSQL</productname>.
</para>
<table>
<title><literal>routine_table_usage</literal> Columns</title>
<tgroup cols="1">
<thead>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
Column Type
</para>
<para>
Description
</para></entry>
</row>
</thead>
<tbody>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>specific_catalog</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the database containing the function (always the current database)
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>specific_schema</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the schema containing the function
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>specific_name</structfield> <type>sql_identifier</type>
</para>
<para>
The <quote>specific name</quote> of the function. See <xref linkend="infoschema-routines"/> for more information.
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>routine_catalog</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the database containing the function (always the current database)
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>routine_schema</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the schema containing the function
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>routine_name</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the function (might be duplicated in case of overloading)
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>table_catalog</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the database that contains the table that is used by the
function (always the current database)
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>table_schema</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the schema that contains the table that is used by the function
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>table_name</structfield> <type>sql_identifier</type>
</para>
<para>
Name of the table that is used by the function
</para></entry>
</row>
</tbody>
</tgroup>
</table>
</sect1>
<sect1 id="infoschema-routines">
<title><literal>routines</literal></title>

100
src/backend/catalog/information_schema.sql
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@ -1325,7 +1325,33 @@ GRANT SELECT ON role_column_grants TO PUBLIC;
* ROUTINE_COLUMN_USAGE view
*/
-- not tracked by PostgreSQL
CREATE VIEW routine_column_usage AS
SELECT CAST(current_database() AS sql_identifier) AS specific_catalog,
CAST(np.nspname AS sql_identifier) AS specific_schema,
CAST(nameconcatoid(p.proname, p.oid) AS sql_identifier) AS specific_name,
CAST(current_database() AS sql_identifier) AS routine_catalog,
CAST(np.nspname AS sql_identifier) AS routine_schema,
CAST(p.proname AS sql_identifier) AS routine_name,
CAST(current_database() AS sql_identifier) AS table_catalog,
CAST(nt.nspname AS sql_identifier) AS table_schema,
CAST(t.relname AS sql_identifier) AS table_name,
CAST(a.attname AS sql_identifier) AS column_name
FROM pg_namespace np, pg_proc p, pg_depend d,
pg_class t, pg_namespace nt, pg_attribute a
WHERE np.oid = p.pronamespace
AND p.oid = d.objid
AND d.classid = 'pg_catalog.pg_proc'::regclass
AND d.refobjid = t.oid
AND d.refclassid = 'pg_catalog.pg_class'::regclass
AND t.relnamespace = nt.oid
AND t.relkind IN ('r', 'v', 'f', 'p')
AND t.oid = a.attrelid
AND d.refobjsubid = a.attnum
AND pg_has_role(t.relowner, 'USAGE');
GRANT SELECT ON routine_column_usage TO PUBLIC;
/*
@ -1408,7 +1434,27 @@ GRANT SELECT ON role_routine_grants TO PUBLIC;
* ROUTINE_ROUTINE_USAGE view
*/
-- not tracked by PostgreSQL
CREATE VIEW routine_routine_usage AS
SELECT CAST(current_database() AS sql_identifier) AS specific_catalog,
CAST(np.nspname AS sql_identifier) AS specific_schema,
CAST(nameconcatoid(p.proname, p.oid) AS sql_identifier) AS specific_name,
CAST(current_database() AS sql_identifier) AS routine_catalog,
CAST(np1.nspname AS sql_identifier) AS routine_schema,
CAST(nameconcatoid(p1.proname, p1.oid) AS sql_identifier) AS routine_name
FROM pg_namespace np, pg_proc p, pg_depend d,
pg_proc p1, pg_namespace np1
WHERE np.oid = p.pronamespace
AND p.oid = d.objid
AND d.classid = 'pg_catalog.pg_proc'::regclass
AND d.refobjid = p1.oid
AND d.refclassid = 'pg_catalog.pg_proc'::regclass
AND p1.pronamespace = np1.oid
AND p.prokind IN ('f', 'p') AND p1.prokind IN ('f', 'p')
AND pg_has_role(p1.proowner, 'USAGE');
GRANT SELECT ON routine_routine_usage TO PUBLIC;
/*
@ -1416,7 +1462,30 @@ GRANT SELECT ON role_routine_grants TO PUBLIC;
* ROUTINE_SEQUENCE_USAGE view
*/
-- not tracked by PostgreSQL
CREATE VIEW routine_sequence_usage AS
SELECT CAST(current_database() AS sql_identifier) AS specific_catalog,
CAST(np.nspname AS sql_identifier) AS specific_schema,
CAST(nameconcatoid(p.proname, p.oid) AS sql_identifier) AS specific_name,
CAST(current_database() AS sql_identifier) AS routine_catalog,
CAST(np.nspname AS sql_identifier) AS routine_schema,
CAST(p.proname AS sql_identifier) AS routine_name,
CAST(current_database() AS sql_identifier) AS sequence_catalog,
CAST(ns.nspname AS sql_identifier) AS sequence_schema,
CAST(s.relname AS sql_identifier) AS sequence_name
FROM pg_namespace np, pg_proc p, pg_depend d,
pg_class s, pg_namespace ns
WHERE np.oid = p.pronamespace
AND p.oid = d.objid
AND d.classid = 'pg_catalog.pg_proc'::regclass
AND d.refobjid = s.oid
AND d.refclassid = 'pg_catalog.pg_class'::regclass
AND s.relnamespace = ns.oid
AND s.relkind = 'S'
AND pg_has_role(s.relowner, 'USAGE');
GRANT SELECT ON routine_sequence_usage TO PUBLIC;
/*
@ -1424,7 +1493,30 @@ GRANT SELECT ON role_routine_grants TO PUBLIC;
* ROUTINE_TABLE_USAGE view
*/
-- not tracked by PostgreSQL
CREATE VIEW routine_table_usage AS
SELECT CAST(current_database() AS sql_identifier) AS specific_catalog,
CAST(np.nspname AS sql_identifier) AS specific_schema,
CAST(nameconcatoid(p.proname, p.oid) AS sql_identifier) AS specific_name,
CAST(current_database() AS sql_identifier) AS routine_catalog,
CAST(np.nspname AS sql_identifier) AS routine_schema,
CAST(p.proname AS sql_identifier) AS routine_name,
CAST(current_database() AS sql_identifier) AS table_catalog,
CAST(nt.nspname AS sql_identifier) AS table_schema,
CAST(t.relname AS sql_identifier) AS table_name
FROM pg_namespace np, pg_proc p, pg_depend d,
pg_class t, pg_namespace nt
WHERE np.oid = p.pronamespace
AND p.oid = d.objid
AND d.classid = 'pg_catalog.pg_proc'::regclass
AND d.refobjid = t.oid
AND d.refclassid = 'pg_catalog.pg_class'::regclass
AND t.relnamespace = nt.oid
AND t.relkind IN ('r', 'v', 'f', 'p')
AND pg_has_role(t.relowner, 'USAGE');
GRANT SELECT ON routine_table_usage TO PUBLIC;
/*

2
src/backend/catalog/sql_features.txt
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@ -243,7 +243,7 @@ F312 MERGE statement NO consider INSERT ... ON CONFLICT DO UPDATE
F313 Enhanced MERGE statement NO
F314 MERGE statement with DELETE branch NO
F321 User authorization YES
F341 Usage tables NO no ROUTINE_*_USAGE tables
F341 Usage tables YES
F361 Subprogram support YES
F381 Extended schema manipulation YES
F381 Extended schema manipulation 01 ALTER TABLE statement: ALTER COLUMN clause YES

2
src/include/catalog/catversion.h
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@ -53,6 +53,6 @@
*/
/* yyyymmddN */
#define CATALOG_VERSION_NO 202102151
#define CATALOG_VERSION_NO 202102171
#endif

38
src/test/regress/expected/create_function_3.out
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@ -284,6 +284,44 @@ SELECT routine_name, ordinal_position, parameter_name, parameter_default
(7 rows)
DROP FUNCTION functest_IS_1(int, int, text), functest_IS_2(int), functest_IS_3(int);
-- routine usage views
CREATE FUNCTION functest_IS_4a() RETURNS int LANGUAGE SQL AS 'SELECT 1';
CREATE FUNCTION functest_IS_4b(x int DEFAULT functest_IS_4a()) RETURNS int LANGUAGE SQL AS 'SELECT x';
CREATE SEQUENCE functest1;
CREATE FUNCTION functest_IS_5(x int DEFAULT nextval('functest1'))
RETURNS int
LANGUAGE SQL
AS 'SELECT x';
SELECT r0.routine_name, r1.routine_name
FROM information_schema.routine_routine_usage rru
JOIN information_schema.routines r0 ON r0.specific_name = rru.specific_name
JOIN information_schema.routines r1 ON r1.specific_name = rru.routine_name;
routine_name | routine_name
----------------+----------------
functest_is_4b | functest_is_4a
(1 row)
SELECT routine_name, sequence_name FROM information_schema.routine_sequence_usage;
routine_name | sequence_name
---------------+---------------
functest_is_5 | functest1
(1 row)
-- currently empty
SELECT routine_name, table_name, column_name FROM information_schema.routine_column_usage;
routine_name | table_name | column_name
--------------+------------+-------------
(0 rows)
SELECT routine_name, table_name FROM information_schema.routine_table_usage;
routine_name | table_name
--------------+------------
(0 rows)
DROP FUNCTION functest_IS_4a CASCADE;
NOTICE: drop cascades to function functest_is_4b(integer)
DROP SEQUENCE functest1 CASCADE;
NOTICE: drop cascades to function functest_is_5(integer)
-- overload
CREATE FUNCTION functest_B_2(bigint) RETURNS bool LANGUAGE 'sql'
IMMUTABLE AS 'SELECT $1 > 0';

24
src/test/regress/sql/create_function_3.sql
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@ -177,6 +177,30 @@ SELECT routine_name, ordinal_position, parameter_name, parameter_default
DROP FUNCTION functest_IS_1(int, int, text), functest_IS_2(int), functest_IS_3(int);
-- routine usage views
CREATE FUNCTION functest_IS_4a() RETURNS int LANGUAGE SQL AS 'SELECT 1';
CREATE FUNCTION functest_IS_4b(x int DEFAULT functest_IS_4a()) RETURNS int LANGUAGE SQL AS 'SELECT x';
CREATE SEQUENCE functest1;
CREATE FUNCTION functest_IS_5(x int DEFAULT nextval('functest1'))
RETURNS int
LANGUAGE SQL
AS 'SELECT x';
SELECT r0.routine_name, r1.routine_name
FROM information_schema.routine_routine_usage rru
JOIN information_schema.routines r0 ON r0.specific_name = rru.specific_name
JOIN information_schema.routines r1 ON r1.specific_name = rru.routine_name;
SELECT routine_name, sequence_name FROM information_schema.routine_sequence_usage;
-- currently empty
SELECT routine_name, table_name, column_name FROM information_schema.routine_column_usage;
SELECT routine_name, table_name FROM information_schema.routine_table_usage;
DROP FUNCTION functest_IS_4a CASCADE;
DROP SEQUENCE functest1 CASCADE;
-- overload
CREATE FUNCTION functest_B_2(bigint) RETURNS bool LANGUAGE 'sql'
IMMUTABLE AS 'SELECT $1 > 0';

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