Add toast-level reloption for vacuum_index_cleanup

a96c41fe has introduced the option for heap, but it still lacked the
variant to control the behavior for toast relations.

While on it, refactor the tests so as they stress more scenarios with
the various values that vacuum_index_cleanup can use.  It would be
useful to couple those tests with pageinspect to check that pages are
actually cleaned up, but this is left for later.

Author: Masahiko Sawada, Michael Paquier
Reviewed-by: Peter Geoghegan
Discussion: https://postgr.es/m/CAD21AoCqs8iN04RX=i1KtLSaX5RrTEM04b7NHYps4+rqtpWNEg@mail.gmail.com

doc/src/sgml/ref/create_table.sgml

@@ -1406,7 +1406,7 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
    </varlistentry>
 
    <varlistentry id="reloption-vacuum-index-cleanup" xreflabel="vacuum_index_cleanup">
-    <term><literal>vacuum_index_cleanup</literal> (<type>boolean</type>)
+    <term><literal>vacuum_index_cleanup</literal>, <literal>toast.vacuum_index_cleanup</literal> (<type>boolean</type>)
     <indexterm>
      <primary><varname>vacuum_index_cleanup</varname> storage parameter</primary>
     </indexterm>

src/backend/access/common/reloptions.c

@@ -144,7 +144,7 @@ static relopt_bool boolRelOpts[] =
 		{
 			"vacuum_index_cleanup",
 			"Enables index vacuuming and index cleanup",
-			RELOPT_KIND_HEAP,
+			RELOPT_KIND_HEAP | RELOPT_KIND_TOAST,
 			ShareUpdateExclusiveLock
 		},
 		true

src/bin/psql/tab-complete.c

@@ -1069,6 +1069,7 @@ static const char *const table_storage_parameters[] = {
 	"toast.autovacuum_vacuum_scale_factor",
 	"toast.autovacuum_vacuum_threshold",
 	"toast.log_autovacuum_min_duration",
+	"toast.vacuum_index_cleanup",
 	"toast.vacuum_truncate",
 	"toast_tuple_target",
 	"user_catalog_table",

src/test/regress/expected/vacuum.out

@@ -93,13 +93,39 @@ SQL function "wrap_do_analyze" statement 1
 VACUUM FULL vactst;
 VACUUM (DISABLE_PAGE_SKIPPING) vaccluster;
 -- INDEX_CLEANUP option
-CREATE TABLE no_index_cleanup (i INT PRIMARY KEY) WITH (vacuum_index_cleanup = false);
-VACUUM (INDEX_CLEANUP FALSE) vaccluster;
-VACUUM (INDEX_CLEANUP FALSE) vactst; -- index cleanup option is ignored if no indexes
-VACUUM (INDEX_CLEANUP FALSE, FREEZE TRUE) vaccluster;
+CREATE TABLE no_index_cleanup (i INT PRIMARY KEY, t TEXT);
+-- Use uncompressed data stored in toast.
+CREATE INDEX no_index_cleanup_idx ON no_index_cleanup(t);
+ALTER TABLE no_index_cleanup ALTER COLUMN t SET STORAGE EXTERNAL;
+INSERT INTO no_index_cleanup(i, t) VALUES (generate_series(1,30),
+    repeat('1234567890',300));
 -- index cleanup option is ignored if VACUUM FULL
 VACUUM (INDEX_CLEANUP TRUE, FULL TRUE) no_index_cleanup;
 VACUUM (FULL TRUE) no_index_cleanup;
+-- Toast inherits the value from its parent table.
+ALTER TABLE no_index_cleanup SET (vacuum_index_cleanup = false);
+DELETE FROM no_index_cleanup WHERE i < 15;
+-- Nothing is cleaned up.
+VACUUM no_index_cleanup;
+-- Both parent relation and toast are cleaned up.
+ALTER TABLE no_index_cleanup SET (vacuum_index_cleanup = true);
+VACUUM no_index_cleanup;
+-- Parameter is set for both the parent table and its toast relation.
+INSERT INTO no_index_cleanup(i, t) VALUES (generate_series(31,60),
+    repeat('1234567890',300));
+DELETE FROM no_index_cleanup WHERE i < 45;
+-- Only toast index is cleaned up.
+ALTER TABLE no_index_cleanup SET (vacuum_index_cleanup = false,
+    toast.vacuum_index_cleanup = true);
+VACUUM no_index_cleanup;
+-- Only parent is cleaned up.
+ALTER TABLE no_index_cleanup SET (vacuum_index_cleanup = true,
+    toast.vacuum_index_cleanup = false);
+VACUUM no_index_cleanup;
+-- Test some extra relations.
+VACUUM (INDEX_CLEANUP FALSE) vaccluster;
+VACUUM (INDEX_CLEANUP FALSE) vactst; -- index cleanup option is ignored if no indexes
+VACUUM (INDEX_CLEANUP FALSE, FREEZE TRUE) vaccluster;
 -- TRUNCATE option
 CREATE TABLE vac_truncate_test(i INT NOT NULL, j text)
 	WITH (vacuum_truncate=true, autovacuum_enabled=false);

src/test/regress/sql/vacuum.sql

@@ -76,13 +76,39 @@ VACUUM FULL vactst;
 VACUUM (DISABLE_PAGE_SKIPPING) vaccluster;
 
 -- INDEX_CLEANUP option
-CREATE TABLE no_index_cleanup (i INT PRIMARY KEY) WITH (vacuum_index_cleanup = false);
-VACUUM (INDEX_CLEANUP FALSE) vaccluster;
-VACUUM (INDEX_CLEANUP FALSE) vactst; -- index cleanup option is ignored if no indexes
-VACUUM (INDEX_CLEANUP FALSE, FREEZE TRUE) vaccluster;
+CREATE TABLE no_index_cleanup (i INT PRIMARY KEY, t TEXT);
+-- Use uncompressed data stored in toast.
+CREATE INDEX no_index_cleanup_idx ON no_index_cleanup(t);
+ALTER TABLE no_index_cleanup ALTER COLUMN t SET STORAGE EXTERNAL;
+INSERT INTO no_index_cleanup(i, t) VALUES (generate_series(1,30),
+    repeat('1234567890',300));
 -- index cleanup option is ignored if VACUUM FULL
 VACUUM (INDEX_CLEANUP TRUE, FULL TRUE) no_index_cleanup;
 VACUUM (FULL TRUE) no_index_cleanup;
+-- Toast inherits the value from its parent table.
+ALTER TABLE no_index_cleanup SET (vacuum_index_cleanup = false);
+DELETE FROM no_index_cleanup WHERE i < 15;
+-- Nothing is cleaned up.
+VACUUM no_index_cleanup;
+-- Both parent relation and toast are cleaned up.
+ALTER TABLE no_index_cleanup SET (vacuum_index_cleanup = true);
+VACUUM no_index_cleanup;
+-- Parameter is set for both the parent table and its toast relation.
+INSERT INTO no_index_cleanup(i, t) VALUES (generate_series(31,60),
+    repeat('1234567890',300));
+DELETE FROM no_index_cleanup WHERE i < 45;
+-- Only toast index is cleaned up.
+ALTER TABLE no_index_cleanup SET (vacuum_index_cleanup = false,
+    toast.vacuum_index_cleanup = true);
+VACUUM no_index_cleanup;
+-- Only parent is cleaned up.
+ALTER TABLE no_index_cleanup SET (vacuum_index_cleanup = true,
+    toast.vacuum_index_cleanup = false);
+VACUUM no_index_cleanup;
+-- Test some extra relations.
+VACUUM (INDEX_CLEANUP FALSE) vaccluster;
+VACUUM (INDEX_CLEANUP FALSE) vactst; -- index cleanup option is ignored if no indexes
+VACUUM (INDEX_CLEANUP FALSE, FREEZE TRUE) vaccluster;
 
 -- TRUNCATE option
 CREATE TABLE vac_truncate_test(i INT NOT NULL, j text)