On 2020-02-11 19:48, Justin Pryzby wrote:
For your v7 patch, which handles REINDEX to a new tablespace, I have a few
minor comments:

+ * the relation will be rebuilt.  If InvalidOid is used, the default

=> should say "currrent", not default ?


Yes, it keeps current index tablespace in that case, thanks.


+++ b/doc/src/sgml/ref/reindex.sgml
+    <term><literal>TABLESPACE</literal></term>
...
+ <term><replaceable class="parameter">new_tablespace</replaceable></term>

=> I saw you split the description of TABLESPACE from new_tablespace based on comment earlier in the thread, but I suggest that the descriptions for these
should be merged, like:

+   <varlistentry>
+    <term><literal>TABLESPACE</literal><replaceable
class="parameter">new_tablespace</replaceable></term>
+    <listitem>
+     <para>
+      Allow specification of a tablespace where all rebuilt indexes
will be created.
+ Cannot be used with "mapped" relations. If <literal>SCHEMA</literal>,
+      <literal>DATABASE</literal> or <literal>SYSTEM</literal> are
specified, then
+      all unsuitable relations will be skipped and a single
<literal>WARNING</literal>
+      will be generated.
+     </para>
+    </listitem>
+   </varlistentry>


It sounds good to me, but here I just obey the structure, which is used all around. Documentation of ALTER TABLE/DATABASE, REINDEX and many others describes each literal/parameter in a separate entry, e.g. new_tablespace. So I would prefer to keep it as it is for now.


The existing patch is very natural, especially the parts in the original patch
handling vacuum full and cluster.  Those were removed to concentrate on
REINDEX, and based on comments that it might be nice if ALTER handled CLUSTER and VACUUM FULL. On a separate thread, I brought up the idea of ALTER using clustered order. Tom pointed out some issues with my implementation, but
didn't like the idea, either.

So I suggest to re-include the CLUSTER/VAC FULL parts as a separate 0002 patch,
the same way they were originally implemented.

BTW, I think if "ALTER" were updated to support REINDEX (to allow multiple
operations at once), it might be either:
|ALTER INDEX i SET TABLESPACE , REINDEX -- to reindex a single index
on a given tlbspc
or
|ALTER TABLE tbl REINDEX USING INDEX TABLESPACE spc; -- to reindex all
inds on table inds moved to a given tblspc
"USING INDEX TABLESPACE" is already used for ALTER..ADD column/table CONSTRAINT.


Yes, I also think that allowing REINDEX/CLUSTER/VACUUM FULL to put resulting relation in a different tablespace is a very natural operation. However, I did a couple of attempts to integrate latter two with ALTER TABLE and failed with it, since it is already complex enough. I am still willing to proceed with it, but not sure how soon it will be.

Anyway, new version is attached. It is rebased in order to resolve conflicts with a recent fix of REINDEX CONCURRENTLY + temp relations, and includes this small comment fix.


Regards
--
Alexey Kondratov

Postgres Professional https://www.postgrespro.com
The Russian Postgres Company
From d2b7a5fa2e11601759b47af0c142a7824ef907a2 Mon Sep 17 00:00:00 2001
From: Alexey Kondratov <kondratov.alek...@gmail.com>
Date: Mon, 30 Dec 2019 20:00:37 +0300
Subject: [PATCH v8] Allow REINDEX to change tablespace

REINDEX already does full relation rewrite, this patch adds a
possibility to specify a new tablespace where new relfilenode
will be created.
---
 doc/src/sgml/ref/reindex.sgml             | 24 +++++-
 src/backend/catalog/index.c               | 75 ++++++++++++++++--
 src/backend/commands/cluster.c            |  2 +-
 src/backend/commands/indexcmds.c          | 96 ++++++++++++++++++++---
 src/backend/commands/tablecmds.c          |  2 +-
 src/backend/nodes/copyfuncs.c             |  1 +
 src/backend/nodes/equalfuncs.c            |  1 +
 src/backend/parser/gram.y                 | 14 ++--
 src/backend/tcop/utility.c                |  6 +-
 src/bin/psql/tab-complete.c               |  6 ++
 src/include/catalog/index.h               |  7 +-
 src/include/commands/defrem.h             |  6 +-
 src/include/nodes/parsenodes.h            |  1 +
 src/test/regress/input/tablespace.source  | 49 ++++++++++++
 src/test/regress/output/tablespace.source | 66 ++++++++++++++++
 15 files changed, 323 insertions(+), 33 deletions(-)

diff --git a/doc/src/sgml/ref/reindex.sgml b/doc/src/sgml/ref/reindex.sgml
index c54a7c420d4..0628c94bb1e 100644
--- a/doc/src/sgml/ref/reindex.sgml
+++ b/doc/src/sgml/ref/reindex.sgml
@@ -21,7 +21,7 @@ PostgreSQL documentation
 
  <refsynopsisdiv>
 <synopsis>
-REINDEX [ ( <replaceable class="parameter">option</replaceable> [, ...] ) ] { INDEX | TABLE | SCHEMA | DATABASE | SYSTEM } [ CONCURRENTLY ] <replaceable class="parameter">name</replaceable>
+REINDEX [ ( <replaceable class="parameter">option</replaceable> [, ...] ) ] { INDEX | TABLE | SCHEMA | DATABASE | SYSTEM } [ CONCURRENTLY ] <replaceable class="parameter">name</replaceable> [ TABLESPACE <replaceable class="parameter">new_tablespace</replaceable> ]
 
 <phrase>where <replaceable class="parameter">option</replaceable> can be one of:</phrase>
 
@@ -174,6 +174,28 @@ REINDEX [ ( <replaceable class="parameter">option</replaceable> [, ...] ) ] { IN
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><literal>TABLESPACE</literal></term>
+    <listitem>
+     <para>
+      This specifies a tablespace, where all rebuilt indexes will be created.
+      Cannot be used with "mapped" relations. If <literal>SCHEMA</literal>,
+      <literal>DATABASE</literal> or <literal>SYSTEM</literal> is specified, then
+      all unsuitable relations will be skipped and a single <literal>WARNING</literal>
+      will be generated.
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><replaceable class="parameter">new_tablespace</replaceable></term>
+    <listitem>
+     <para>
+      The name of the specific tablespace to store rebuilt indexes.
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><literal>VERBOSE</literal></term>
     <listitem>
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 8880586c372..fd07379118c 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -1235,9 +1235,13 @@ index_create(Relation heapRelation,
  * Create concurrently an index based on the definition of the one provided by
  * caller.  The index is inserted into catalogs and needs to be built later
  * on.  This is called during concurrent reindex processing.
+ *
+ * "tablespaceOid" is the new tablespace to use for this index.  If
+ * InvalidOid, use the tablespace in-use instead.
  */
 Oid
-index_concurrently_create_copy(Relation heapRelation, Oid oldIndexId, const char *newName)
+index_concurrently_create_copy(Relation heapRelation, Oid oldIndexId,
+							   Oid tablespaceOid, const char *newName)
 {
 	Relation	indexRelation;
 	IndexInfo  *oldInfo,
@@ -1367,7 +1371,8 @@ index_concurrently_create_copy(Relation heapRelation, Oid oldIndexId, const char
 							  newInfo,
 							  indexColNames,
 							  indexRelation->rd_rel->relam,
-							  indexRelation->rd_rel->reltablespace,
+							  OidIsValid(tablespaceOid) ?
+								tablespaceOid : indexRelation->rd_rel->reltablespace,
 							  indexRelation->rd_indcollation,
 							  indclass->values,
 							  indcoloptions->values,
@@ -3408,10 +3413,12 @@ IndexGetRelation(Oid indexId, bool missing_ok)
 
 /*
  * reindex_index - This routine is used to recreate a single index
+ *
+ * See comments of reindex_relation() for details about "tablespaceOid".
  */
 void
-reindex_index(Oid indexId, bool skip_constraint_checks, char persistence,
-			  int options)
+reindex_index(Oid indexId, Oid tablespaceOid, bool skip_constraint_checks,
+			  char persistence, int options)
 {
 	Relation	iRel,
 				heapRelation;
@@ -3458,6 +3465,16 @@ reindex_index(Oid indexId, bool skip_constraint_checks, char persistence,
 		elog(ERROR, "unsupported relation kind for index \"%s\"",
 			 RelationGetRelationName(iRel));
 
+	/*
+	 * We cannot support moving mapped relations into different tablespaces.
+	 * (In particular this eliminates all shared catalogs.)
+	 */
+	if (OidIsValid(tablespaceOid) && RelationIsMapped(iRel))
+		ereport(ERROR,
+				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+				 errmsg("cannot move system relation \"%s\"",
+						RelationGetRelationName(iRel))));
+
 	/*
 	 * Don't allow reindex on temp tables of other backends ... their local
 	 * buffer manager is not going to cope.
@@ -3473,6 +3490,45 @@ reindex_index(Oid indexId, bool skip_constraint_checks, char persistence,
 	 */
 	CheckTableNotInUse(iRel, "REINDEX INDEX");
 
+	/*
+	 * Set the new tablespace for the relation.  Do that only in the
+	 * case where the reindex caller wishes to enforce a new tablespace.
+	 */
+	if (OidIsValid(tablespaceOid) &&
+		tablespaceOid != iRel->rd_rel->reltablespace)
+	{
+		Relation		pg_class;
+		Form_pg_class	rd_rel;
+		HeapTuple		tuple;
+
+		/* First get a modifiable copy of the relation's pg_class row */
+		pg_class = table_open(RelationRelationId, RowExclusiveLock);
+
+		tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(indexId));
+		if (!HeapTupleIsValid(tuple))
+			elog(ERROR, "cache lookup failed for relation %u", indexId);
+		rd_rel = (Form_pg_class) GETSTRUCT(tuple);
+
+		/*
+		 * Mark the relation as ready to be dropped at transaction commit,
+		 * before making visible the new tablespace change so as this won't
+		 * miss things.
+		 */
+		RelationDropStorage(iRel);
+
+		/* Update the pg_class row */
+		rd_rel->reltablespace = (tablespaceOid == MyDatabaseTableSpace) ?
+			InvalidOid : tablespaceOid;
+		CatalogTupleUpdate(pg_class, &tuple->t_self, tuple);
+
+		heap_freetuple(tuple);
+
+		table_close(pg_class, RowExclusiveLock);
+
+		/* Make sure the reltablespace change is visible */
+		CommandCounterIncrement();
+	}
+
 	/*
 	 * All predicate locks on the index are about to be made invalid. Promote
 	 * them to relation locks on the heap.
@@ -3611,6 +3667,10 @@ reindex_index(Oid indexId, bool skip_constraint_checks, char persistence,
  * reindex_relation - This routine is used to recreate all indexes
  * of a relation (and optionally its toast relation too, if any).
  *
+ * "tablespaceOid" defines the new tablespace where the indexes of
+ * the relation will be rebuilt.  If InvalidOid is used, the current
+ * tablespace of each index is used instead.
+ *
  * "flags" is a bitmask that can include any combination of these bits:
  *
  * REINDEX_REL_PROCESS_TOAST: if true, process the toast table too (if any).
@@ -3643,7 +3703,7 @@ reindex_index(Oid indexId, bool skip_constraint_checks, char persistence,
  * index rebuild.
  */
 bool
-reindex_relation(Oid relid, int flags, int options)
+reindex_relation(Oid relid, Oid tablespaceOid, int flags, int options)
 {
 	Relation	rel;
 	Oid			toast_relid;
@@ -3717,7 +3777,8 @@ reindex_relation(Oid relid, int flags, int options)
 		{
 			Oid			indexOid = lfirst_oid(indexId);
 
-			reindex_index(indexOid, !(flags & REINDEX_REL_CHECK_CONSTRAINTS),
+			reindex_index(indexOid, tablespaceOid,
+						  !(flags & REINDEX_REL_CHECK_CONSTRAINTS),
 						  persistence, options);
 
 			CommandCounterIncrement();
@@ -3750,7 +3811,7 @@ reindex_relation(Oid relid, int flags, int options)
 	 * still hold the lock on the master table.
 	 */
 	if ((flags & REINDEX_REL_PROCESS_TOAST) && OidIsValid(toast_relid))
-		result |= reindex_relation(toast_relid, flags, options);
+		result |= reindex_relation(toast_relid, tablespaceOid, flags, options);
 
 	return result;
 }
diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index 11ce1bb4046..9e5b28903aa 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -1406,7 +1406,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap,
 	pgstat_progress_update_param(PROGRESS_CLUSTER_PHASE,
 								 PROGRESS_CLUSTER_PHASE_REBUILD_INDEX);
 
-	reindex_relation(OIDOldHeap, reindex_flags, 0);
+	reindex_relation(OIDOldHeap, InvalidOid, reindex_flags, 0);
 
 	/* Report that we are now doing clean up */
 	pgstat_progress_update_param(PROGRESS_CLUSTER_PHASE,
diff --git a/src/backend/commands/indexcmds.c b/src/backend/commands/indexcmds.c
index ec20ba38d13..d508f552075 100644
--- a/src/backend/commands/indexcmds.c
+++ b/src/backend/commands/indexcmds.c
@@ -87,7 +87,7 @@ static char *ChooseIndexNameAddition(List *colnames);
 static List *ChooseIndexColumnNames(List *indexElems);
 static void RangeVarCallbackForReindexIndex(const RangeVar *relation,
 											Oid relId, Oid oldRelId, void *arg);
-static bool ReindexRelationConcurrently(Oid relationOid, int options);
+static bool ReindexRelationConcurrently(Oid relationOid, Oid tablespaceOid, int options);
 static void ReindexPartitionedIndex(Relation parentIdx);
 static void update_relispartition(Oid relationId, bool newval);
 
@@ -2331,10 +2331,11 @@ ChooseIndexColumnNames(List *indexElems)
  *		Recreate a specific index.
  */
 void
-ReindexIndex(RangeVar *indexRelation, int options, bool concurrent)
+ReindexIndex(RangeVar *indexRelation, char *newTableSpaceName, int options, bool concurrent)
 {
 	struct ReindexIndexCallbackState state;
 	Oid			indOid;
+	Oid			tablespaceOid = InvalidOid;
 	Relation	irel;
 	char		persistence;
 
@@ -2369,12 +2370,26 @@ ReindexIndex(RangeVar *indexRelation, int options, bool concurrent)
 	}
 
 	persistence = irel->rd_rel->relpersistence;
+
+	/* Define new tablespaceOid if it is wanted by caller */
+	if (newTableSpaceName)
+	{
+		tablespaceOid = get_tablespace_oid(newTableSpaceName, false);
+
+		/* Can't move a non-shared relation into pg_global */
+		if (tablespaceOid == GLOBALTABLESPACE_OID)
+			ereport(ERROR,
+					(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+					 errmsg("cannot move non-shared relation to tablespace \"%s\"",
+							newTableSpaceName)));
+	}
+
 	index_close(irel, NoLock);
 
 	if (concurrent && persistence != RELPERSISTENCE_TEMP)
-		ReindexRelationConcurrently(indOid, options);
+		ReindexRelationConcurrently(indOid, tablespaceOid, options);
 	else
-		reindex_index(indOid, false, persistence,
+		reindex_index(indOid, tablespaceOid, false, persistence,
 					  options | REINDEXOPT_REPORT_PROGRESS);
 }
 
@@ -2453,10 +2468,11 @@ RangeVarCallbackForReindexIndex(const RangeVar *relation,
  *		Recreate all indexes of a table (and of its toast table, if any)
  */
 Oid
-ReindexTable(RangeVar *relation, int options, bool concurrent)
+ReindexTable(RangeVar *relation, char *newTableSpaceName, int options, bool concurrent)
 {
 	Oid			heapOid;
 	bool		result;
+	Oid 		tablespaceOid = InvalidOid;
 
 	/*
 	 * The lock level used here should match reindex_relation().
@@ -2471,9 +2487,22 @@ ReindexTable(RangeVar *relation, int options, bool concurrent)
 									   0,
 									   RangeVarCallbackOwnsTable, NULL);
 
+	/* Define new tablespaceOid if it is wanted by caller */
+	if (newTableSpaceName)
+	{
+		tablespaceOid = get_tablespace_oid(newTableSpaceName, false);
+
+		/* Can't move a non-shared relation into pg_global */
+		if (tablespaceOid == GLOBALTABLESPACE_OID)
+			ereport(ERROR,
+					(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+					 errmsg("cannot move non-shared relation to tablespace \"%s\"",
+							newTableSpaceName)));
+	}
+
 	if (concurrent && get_rel_persistence(heapOid) != RELPERSISTENCE_TEMP)
 	{
-		result = ReindexRelationConcurrently(heapOid, options);
+		result = ReindexRelationConcurrently(heapOid, tablespaceOid, options);
 
 		if (!result)
 			ereport(NOTICE,
@@ -2483,6 +2512,7 @@ ReindexTable(RangeVar *relation, int options, bool concurrent)
 	else
 	{
 		result = reindex_relation(heapOid,
+								  tablespaceOid,
 								  REINDEX_REL_PROCESS_TOAST |
 								  REINDEX_REL_CHECK_CONSTRAINTS,
 								  options | REINDEXOPT_REPORT_PROGRESS);
@@ -2504,10 +2534,11 @@ ReindexTable(RangeVar *relation, int options, bool concurrent)
  * That means this must not be called within a user transaction block!
  */
 void
-ReindexMultipleTables(const char *objectName, ReindexObjectType objectKind,
+ReindexMultipleTables(const char *objectName, ReindexObjectType objectKind, char *newTableSpaceName,
 					  int options, bool concurrent)
 {
 	Oid			objectOid;
+	Oid			tablespaceOid = InvalidOid;
 	Relation	relationRelation;
 	TableScanDesc scan;
 	ScanKeyData scan_keys[1];
@@ -2518,6 +2549,7 @@ ReindexMultipleTables(const char *objectName, ReindexObjectType objectKind,
 	ListCell   *l;
 	int			num_keys;
 	bool		concurrent_warning = false;
+	bool		mapped_warning = false;
 
 	AssertArg(objectName);
 	Assert(objectKind == REINDEX_OBJECT_SCHEMA ||
@@ -2556,6 +2588,19 @@ ReindexMultipleTables(const char *objectName, ReindexObjectType objectKind,
 						   objectName);
 	}
 
+	/* Define new tablespaceOid if it is wanted by caller */
+	if (newTableSpaceName)
+	{
+		tablespaceOid = get_tablespace_oid(newTableSpaceName, false);
+
+		/* Can't move a non-shared relation into pg_global */
+		if (tablespaceOid == GLOBALTABLESPACE_OID)
+			ereport(ERROR,
+					(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+					 errmsg("cannot move non-shared relation to tablespace \"%s\"",
+							newTableSpaceName)));
+	}
+
 	/*
 	 * Create a memory context that will survive forced transaction commits we
 	 * do below.  Since it is a child of PortalContext, it will go away
@@ -2646,6 +2691,22 @@ ReindexMultipleTables(const char *objectName, ReindexObjectType objectKind,
 			continue;
 		}
 
+		/*
+		 * Skip all mapped relations if TABLESPACE is specified.
+		 * relfilenode == 0 checks after that, similarly to
+		 * RelationIsMapped().
+		 */
+		if (OidIsValid(tablespaceOid) &&
+			!OidIsValid(classtuple->relfilenode))
+		{
+			if (!mapped_warning)
+				ereport(WARNING,
+						(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+						 errmsg("cannot change tablespace of indexes for mapped relations, skipping all")));
+			mapped_warning = true;
+			continue;
+		}
+
 		/* Save the list of relation OIDs in private context */
 		old = MemoryContextSwitchTo(private_context);
 
@@ -2679,7 +2740,7 @@ ReindexMultipleTables(const char *objectName, ReindexObjectType objectKind,
 
 		if (concurrent && get_rel_persistence(relid) != RELPERSISTENCE_TEMP)
 		{
-			(void) ReindexRelationConcurrently(relid, options);
+			(void) ReindexRelationConcurrently(relid, tablespaceOid, options);
 			/* ReindexRelationConcurrently() does the verbose output */
 		}
 		else
@@ -2687,6 +2748,7 @@ ReindexMultipleTables(const char *objectName, ReindexObjectType objectKind,
 			bool		result;
 
 			result = reindex_relation(relid,
+									  tablespaceOid,
 									  REINDEX_REL_PROCESS_TOAST |
 									  REINDEX_REL_CHECK_CONSTRAINTS,
 									  options | REINDEXOPT_REPORT_PROGRESS);
@@ -2719,6 +2781,9 @@ ReindexMultipleTables(const char *objectName, ReindexObjectType objectKind,
  * itself will be rebuilt.  If 'relationOid' belongs to a partitioned table
  * then we issue a warning to mention these are not yet supported.
  *
+ * 'tablespaceOid' defines the new tablespace where the indexes of
+ * the relation will be rebuilt.
+ *
  * The locks taken on parent tables and involved indexes are kept until the
  * transaction is committed, at which point a session lock is taken on each
  * relation.  Both of these protect against concurrent schema changes.
@@ -2733,7 +2798,7 @@ ReindexMultipleTables(const char *objectName, ReindexObjectType objectKind,
  * anyway, and a non-concurrent reindex is more efficient.
  */
 static bool
-ReindexRelationConcurrently(Oid relationOid, int options)
+ReindexRelationConcurrently(Oid relationOid, Oid tablespaceOid, int options)
 {
 	List	   *heapRelationIds = NIL;
 	List	   *indexIds = NIL;
@@ -2806,6 +2871,12 @@ ReindexRelationConcurrently(Oid relationOid, int options)
 				/* Open relation to get its indexes */
 				heapRelation = table_open(relationOid, ShareUpdateExclusiveLock);
 
+				if (OidIsValid(tablespaceOid) && RelationIsMapped(heapRelation))
+					ereport(ERROR,
+							(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+							 errmsg("cannot change tablespace of indexes for mapped relation \"%s\"",
+									RelationGetRelationName(heapRelation))));
+
 				/* Add all the valid indexes of relation to list */
 				foreach(lc, RelationGetIndexList(heapRelation))
 				{
@@ -2978,6 +3049,12 @@ ReindexRelationConcurrently(Oid relationOid, int options)
 		if (indexRel->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
 			elog(ERROR, "cannot reindex a temporary table concurrently");
 
+		if (OidIsValid(tablespaceOid) && RelationIsMapped(heapRel))
+			ereport(ERROR,
+					(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+					 errmsg("cannot change tablespace of mapped relation \"%s\"",
+							RelationGetRelationName(heapRel))));
+
 		pgstat_progress_start_command(PROGRESS_COMMAND_CREATE_INDEX,
 									  RelationGetRelid(heapRel));
 		pgstat_progress_update_param(PROGRESS_CREATEIDX_COMMAND,
@@ -2997,6 +3074,7 @@ ReindexRelationConcurrently(Oid relationOid, int options)
 		/* Create new index definition based on given index */
 		newIndexId = index_concurrently_create_copy(heapRel,
 													indexId,
+													tablespaceOid,
 													concurrentName);
 
 		/*
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 02a7c04fdb7..9d2185605fb 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -1870,7 +1870,7 @@ ExecuteTruncateGuts(List *explicit_rels, List *relids, List *relids_logged,
 			/*
 			 * Reconstruct the indexes to match, and we're done.
 			 */
-			reindex_relation(heap_relid, REINDEX_REL_PROCESS_TOAST, 0);
+			reindex_relation(heap_relid, InvalidOid, REINDEX_REL_PROCESS_TOAST, 0);
 		}
 
 		pgstat_count_truncate(rel);
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index e04c33e4ad7..83ab90c6123 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -4395,6 +4395,7 @@ _copyReindexStmt(const ReindexStmt *from)
 	COPY_STRING_FIELD(name);
 	COPY_SCALAR_FIELD(options);
 	COPY_SCALAR_FIELD(concurrent);
+	COPY_STRING_FIELD(tablespacename);
 
 	return newnode;
 }
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index 5b1ba143b1c..e63ed0729b9 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -2122,6 +2122,7 @@ _equalReindexStmt(const ReindexStmt *a, const ReindexStmt *b)
 	COMPARE_STRING_FIELD(name);
 	COMPARE_SCALAR_FIELD(options);
 	COMPARE_SCALAR_FIELD(concurrent);
+	COMPARE_STRING_FIELD(tablespacename);
 
 	return true;
 }
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index 96e7fdbcfe2..5b47fb664a7 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -8384,31 +8384,33 @@ DropTransformStmt: DROP TRANSFORM opt_if_exists FOR Typename LANGUAGE name opt_d
  *
  *		QUERY:
  *
- *		REINDEX [ (options) ] type [CONCURRENTLY] <name>
+ *		REINDEX [ (options) ] type [CONCURRENTLY] <name> [ TABLESPACE <tablespace_name> ]
  *****************************************************************************/
 
 ReindexStmt:
-			REINDEX reindex_target_type opt_concurrently qualified_name
+			REINDEX reindex_target_type opt_concurrently qualified_name OptTableSpace
 				{
 					ReindexStmt *n = makeNode(ReindexStmt);
 					n->kind = $2;
 					n->concurrent = $3;
 					n->relation = $4;
+					n->tablespacename = $5;
 					n->name = NULL;
 					n->options = 0;
 					$$ = (Node *)n;
 				}
-			| REINDEX reindex_target_multitable opt_concurrently name
+			| REINDEX reindex_target_multitable opt_concurrently name OptTableSpace
 				{
 					ReindexStmt *n = makeNode(ReindexStmt);
 					n->kind = $2;
 					n->concurrent = $3;
 					n->name = $4;
+					n->tablespacename = $5;
 					n->relation = NULL;
 					n->options = 0;
 					$$ = (Node *)n;
 				}
-			| REINDEX '(' reindex_option_list ')' reindex_target_type opt_concurrently qualified_name
+			| REINDEX '(' reindex_option_list ')' reindex_target_type opt_concurrently qualified_name OptTableSpace
 				{
 					ReindexStmt *n = makeNode(ReindexStmt);
 					n->kind = $5;
@@ -8416,9 +8418,10 @@ ReindexStmt:
 					n->relation = $7;
 					n->name = NULL;
 					n->options = $3;
+					n->tablespacename = $8;
 					$$ = (Node *)n;
 				}
-			| REINDEX '(' reindex_option_list ')' reindex_target_multitable opt_concurrently name
+			| REINDEX '(' reindex_option_list ')' reindex_target_multitable opt_concurrently name OptTableSpace
 				{
 					ReindexStmt *n = makeNode(ReindexStmt);
 					n->kind = $5;
@@ -8426,6 +8429,7 @@ ReindexStmt:
 					n->name = $7;
 					n->relation = NULL;
 					n->options = $3;
+					n->tablespacename = $8;
 					$$ = (Node *)n;
 				}
 		;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index bb85b5e52aa..3c5c2150027 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -933,10 +933,10 @@ standard_ProcessUtility(PlannedStmt *pstmt,
 				switch (stmt->kind)
 				{
 					case REINDEX_OBJECT_INDEX:
-						ReindexIndex(stmt->relation, stmt->options, stmt->concurrent);
+						ReindexIndex(stmt->relation, stmt->tablespacename, stmt->options, stmt->concurrent);
 						break;
 					case REINDEX_OBJECT_TABLE:
-						ReindexTable(stmt->relation, stmt->options, stmt->concurrent);
+						ReindexTable(stmt->relation, stmt->tablespacename, stmt->options, stmt->concurrent);
 						break;
 					case REINDEX_OBJECT_SCHEMA:
 					case REINDEX_OBJECT_SYSTEM:
@@ -952,7 +952,7 @@ standard_ProcessUtility(PlannedStmt *pstmt,
 												  (stmt->kind == REINDEX_OBJECT_SCHEMA) ? "REINDEX SCHEMA" :
 												  (stmt->kind == REINDEX_OBJECT_SYSTEM) ? "REINDEX SYSTEM" :
 												  "REINDEX DATABASE");
-						ReindexMultipleTables(stmt->name, stmt->kind, stmt->options, stmt->concurrent);
+						ReindexMultipleTables(stmt->name, stmt->kind, stmt->tablespacename, stmt->options, stmt->concurrent);
 						break;
 					default:
 						elog(ERROR, "unrecognized object type: %d",
diff --git a/src/bin/psql/tab-complete.c b/src/bin/psql/tab-complete.c
index b6b08d0ccb6..5df5c80854c 100644
--- a/src/bin/psql/tab-complete.c
+++ b/src/bin/psql/tab-complete.c
@@ -3424,6 +3424,12 @@ psql_completion(const char *text, int start, int end)
 		COMPLETE_WITH_QUERY(Query_for_list_of_schemas);
 	else if (Matches("REINDEX", "SYSTEM|DATABASE", "CONCURRENTLY"))
 		COMPLETE_WITH_QUERY(Query_for_list_of_databases);
+	else if (Matches("REINDEX", MatchAny, "CONCURRENTLY", MatchAny))
+		COMPLETE_WITH("TABLESPACE");
+	else if (Matches("REINDEX", MatchAny, MatchAny))
+		COMPLETE_WITH("TABLESPACE");
+	else if (TailMatches("TABLESPACE"))
+		COMPLETE_WITH_QUERY(Query_for_list_of_tablespaces);
 
 /* SECURITY LABEL */
 	else if (Matches("SECURITY"))
diff --git a/src/include/catalog/index.h b/src/include/catalog/index.h
index a2890c1314d..f38e978b45d 100644
--- a/src/include/catalog/index.h
+++ b/src/include/catalog/index.h
@@ -80,6 +80,7 @@ extern Oid	index_create(Relation heapRelation,
 
 extern Oid	index_concurrently_create_copy(Relation heapRelation,
 										   Oid oldIndexId,
+										   Oid tablespaceOid,
 										   const char *newName);
 
 extern void index_concurrently_build(Oid heapRelationId,
@@ -131,8 +132,8 @@ extern void validate_index(Oid heapId, Oid indexId, Snapshot snapshot);
 
 extern void index_set_state_flags(Oid indexId, IndexStateFlagsAction action);
 
-extern void reindex_index(Oid indexId, bool skip_constraint_checks,
-						  char relpersistence, int options);
+extern void reindex_index(Oid indexId, Oid tablespaceOid, bool skip_constraint_checks,
+			  char relpersistence, int options);
 
 /* Flag bits for reindex_relation(): */
 #define REINDEX_REL_PROCESS_TOAST			0x01
@@ -141,7 +142,7 @@ extern void reindex_index(Oid indexId, bool skip_constraint_checks,
 #define REINDEX_REL_FORCE_INDEXES_UNLOGGED	0x08
 #define REINDEX_REL_FORCE_INDEXES_PERMANENT 0x10
 
-extern bool reindex_relation(Oid relid, int flags, int options);
+extern bool reindex_relation(Oid relid, Oid tablespaceOid, int flags, int options);
 
 extern bool ReindexIsProcessingHeap(Oid heapOid);
 extern bool ReindexIsProcessingIndex(Oid indexOid);
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dede9d788ec..4999e590e67 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -34,10 +34,10 @@ extern ObjectAddress DefineIndex(Oid relationId,
 								 bool check_not_in_use,
 								 bool skip_build,
 								 bool quiet);
-extern void ReindexIndex(RangeVar *indexRelation, int options, bool concurrent);
-extern Oid	ReindexTable(RangeVar *relation, int options, bool concurrent);
+extern void ReindexIndex(RangeVar *indexRelation, char *newTableSpaceName, int options, bool concurrent);
+extern Oid	ReindexTable(RangeVar *relation, char *newTableSpaceName, int options, bool concurrent);
 extern void ReindexMultipleTables(const char *objectName, ReindexObjectType objectKind,
-								  int options, bool concurrent);
+								  char *newTableSpaceName, int options, bool concurrent);
 extern char *makeObjectName(const char *name1, const char *name2,
 							const char *label);
 extern char *ChooseRelationName(const char *name1, const char *name2,
diff --git a/src/include/nodes/parsenodes.h b/src/include/nodes/parsenodes.h
index da0706add59..7900bb07265 100644
--- a/src/include/nodes/parsenodes.h
+++ b/src/include/nodes/parsenodes.h
@@ -3354,6 +3354,7 @@ typedef struct ReindexStmt
 	const char *name;			/* name of database to reindex */
 	int			options;		/* Reindex options flags */
 	bool		concurrent;		/* reindex concurrently? */
+	char	   *tablespacename; /* name of tablespace to store index */
 } ReindexStmt;
 
 /* ----------------------
diff --git a/src/test/regress/input/tablespace.source b/src/test/regress/input/tablespace.source
index a5f61a35dc5..7d698d4294d 100644
--- a/src/test/regress/input/tablespace.source
+++ b/src/test/regress/input/tablespace.source
@@ -17,6 +17,52 @@ ALTER TABLESPACE regress_tblspace SET (some_nonexistent_parameter = true);  -- f
 ALTER TABLESPACE regress_tblspace RESET (random_page_cost = 2.0); -- fail
 ALTER TABLESPACE regress_tblspace RESET (random_page_cost, effective_io_concurrency); -- ok
 
+-- create table to test REINDEX with TABLESPACE change
+CREATE TABLE regress_tblspace_test_tbl (num1 bigint, num2 double precision, num3 double precision);
+INSERT INTO regress_tblspace_test_tbl (num1, num2, num3)
+  SELECT round(random()*100), random(), random()*42
+  FROM generate_series(1, 20000) s(i);
+CREATE INDEX regress_tblspace_test_tbl_idx ON regress_tblspace_test_tbl (num1);
+
+-- check that REINDEX with TABLESPACE change is transactional
+BEGIN;
+REINDEX INDEX regress_tblspace_test_tbl_idx TABLESPACE regress_tblspace;
+REINDEX TABLE regress_tblspace_test_tbl TABLESPACE regress_tblspace;
+ROLLBACK;
+BEGIN;
+REINDEX TABLE pg_am TABLESPACE regress_tblspace;
+ROLLBACK;
+SELECT relname FROM pg_class
+WHERE reltablespace=(SELECT oid FROM pg_tablespace WHERE spcname='regress_tblspace');
+
+-- first, let us reindex and move the entire database, after that return everything back
+REINDEX DATABASE regression TABLESPACE regress_tblspace; -- ok with warning
+REINDEX DATABASE regression TABLESPACE pg_default; -- ok with warning
+SELECT relname FROM pg_class
+WHERE reltablespace=(SELECT oid FROM pg_tablespace WHERE spcname='regress_tblspace');
+
+-- check REINDEX with TABLESPACE change
+REINDEX INDEX regress_tblspace_test_tbl_idx TABLESPACE regress_tblspace; -- ok
+REINDEX TABLE regress_tblspace_test_tbl TABLESPACE regress_tblspace; -- ok
+REINDEX TABLE pg_authid TABLESPACE regress_tblspace; -- fail
+REINDEX SYSTEM CONCURRENTLY postgres TABLESPACE regress_tblspace; -- fail
+REINDEX TABLE CONCURRENTLY pg_am TABLESPACE regress_tblspace; -- fail
+REINDEX INDEX regress_tblspace_test_tbl_idx TABLESPACE pg_global; -- fail
+REINDEX TABLE pg_am TABLESPACE regress_tblspace; -- ok
+
+-- check that all relations moved to new tablespace
+SELECT relname FROM pg_class
+WHERE reltablespace=(SELECT oid FROM pg_tablespace WHERE spcname='regress_tblspace')
+ORDER BY relname;
+
+-- move back to pg_default tablespace
+REINDEX TABLE CONCURRENTLY regress_tblspace_test_tbl TABLESPACE pg_default; -- ok
+REINDEX TABLE pg_am TABLESPACE pg_default; -- ok
+
+-- check that all relations moved back to pg_default
+SELECT relname FROM pg_class
+WHERE reltablespace=(SELECT oid FROM pg_tablespace WHERE spcname='regress_tblspace');
+
 -- create a schema we can use
 CREATE SCHEMA testschema;
 
@@ -279,6 +325,9 @@ ALTER TABLE ALL IN TABLESPACE regress_tblspace_renamed SET TABLESPACE pg_default
 -- Should succeed
 DROP TABLESPACE regress_tblspace_renamed;
 
+DROP INDEX regress_tblspace_test_tbl_idx;
+DROP TABLE regress_tblspace_test_tbl;
+
 DROP SCHEMA testschema CASCADE;
 
 DROP ROLE regress_tablespace_user1;
diff --git a/src/test/regress/output/tablespace.source b/src/test/regress/output/tablespace.source
index 162b591b315..bd17feaa73f 100644
--- a/src/test/regress/output/tablespace.source
+++ b/src/test/regress/output/tablespace.source
@@ -20,6 +20,70 @@ ERROR:  unrecognized parameter "some_nonexistent_parameter"
 ALTER TABLESPACE regress_tblspace RESET (random_page_cost = 2.0); -- fail
 ERROR:  RESET must not include values for parameters
 ALTER TABLESPACE regress_tblspace RESET (random_page_cost, effective_io_concurrency); -- ok
+-- create table to test REINDEX with TABLESPACE change
+CREATE TABLE regress_tblspace_test_tbl (num1 bigint, num2 double precision, num3 double precision);
+INSERT INTO regress_tblspace_test_tbl (num1, num2, num3)
+  SELECT round(random()*100), random(), random()*42
+  FROM generate_series(1, 20000) s(i);
+CREATE INDEX regress_tblspace_test_tbl_idx ON regress_tblspace_test_tbl (num1);
+-- check that REINDEX with TABLESPACE change is transactional
+BEGIN;
+REINDEX INDEX regress_tblspace_test_tbl_idx TABLESPACE regress_tblspace;
+REINDEX TABLE regress_tblspace_test_tbl TABLESPACE regress_tblspace;
+ROLLBACK;
+BEGIN;
+REINDEX TABLE pg_am TABLESPACE regress_tblspace;
+ROLLBACK;
+SELECT relname FROM pg_class
+WHERE reltablespace=(SELECT oid FROM pg_tablespace WHERE spcname='regress_tblspace');
+ relname 
+---------
+(0 rows)
+
+-- first, let us reindex and move the entire database, after that return everything back
+REINDEX DATABASE regression TABLESPACE regress_tblspace; -- ok with warning
+WARNING:  cannot change tablespace of indexes for mapped relations, skipping all
+REINDEX DATABASE regression TABLESPACE pg_default; -- ok with warning
+WARNING:  cannot change tablespace of indexes for mapped relations, skipping all
+SELECT relname FROM pg_class
+WHERE reltablespace=(SELECT oid FROM pg_tablespace WHERE spcname='regress_tblspace');
+ relname 
+---------
+(0 rows)
+
+-- check REINDEX with TABLESPACE change
+REINDEX INDEX regress_tblspace_test_tbl_idx TABLESPACE regress_tblspace; -- ok
+REINDEX TABLE regress_tblspace_test_tbl TABLESPACE regress_tblspace; -- ok
+REINDEX TABLE pg_authid TABLESPACE regress_tblspace; -- fail
+ERROR:  cannot move system relation "pg_authid_rolname_index"
+REINDEX SYSTEM CONCURRENTLY postgres TABLESPACE regress_tblspace; -- fail
+ERROR:  cannot reindex system catalogs concurrently
+REINDEX TABLE CONCURRENTLY pg_am TABLESPACE regress_tblspace; -- fail
+ERROR:  cannot reindex system catalogs concurrently
+REINDEX INDEX regress_tblspace_test_tbl_idx TABLESPACE pg_global; -- fail
+ERROR:  cannot move non-shared relation to tablespace "pg_global"
+REINDEX TABLE pg_am TABLESPACE regress_tblspace; -- ok
+-- check that all relations moved to new tablespace
+SELECT relname FROM pg_class
+WHERE reltablespace=(SELECT oid FROM pg_tablespace WHERE spcname='regress_tblspace')
+ORDER BY relname;
+            relname            
+-------------------------------
+ pg_am_name_index
+ pg_am_oid_index
+ regress_tblspace_test_tbl_idx
+(3 rows)
+
+-- move back to pg_default tablespace
+REINDEX TABLE CONCURRENTLY regress_tblspace_test_tbl TABLESPACE pg_default; -- ok
+REINDEX TABLE pg_am TABLESPACE pg_default; -- ok
+-- check that all relations moved back to pg_default
+SELECT relname FROM pg_class
+WHERE reltablespace=(SELECT oid FROM pg_tablespace WHERE spcname='regress_tblspace');
+ relname 
+---------
+(0 rows)
+
 -- create a schema we can use
 CREATE SCHEMA testschema;
 -- try a table
@@ -736,6 +800,8 @@ ALTER TABLE ALL IN TABLESPACE regress_tblspace_renamed SET TABLESPACE pg_default
 NOTICE:  no matching relations in tablespace "regress_tblspace_renamed" found
 -- Should succeed
 DROP TABLESPACE regress_tblspace_renamed;
+DROP INDEX regress_tblspace_test_tbl_idx;
+DROP TABLE regress_tblspace_test_tbl;
 DROP SCHEMA testschema CASCADE;
 NOTICE:  drop cascades to 6 other objects
 DETAIL:  drop cascades to table testschema.foo

base-commit: 80d76be51cfb7f8f54e779ec5a287d80ac28b6e4
-- 
2.19.1

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