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Don't allow partitioned index on foreign-table partitions

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Creating indexes on foreign tables is already forbidden, but local
partitioned indexes (commit 8b08f7d4820f) forgot to check for them.  Add
a preliminary check to prevent wasting time.

Another school of thought says to allow the index to be created if it's
not a unique index; but it's possible to do better in the future (enable
indexing of foreign tables, somehow), so we avoid painting ourselves in
a corner by rejecting all cases, to avoid future grief (a.k.a. backward
incompatible changes).

Reported-by: Arseny Sher
Author: Amit Langote, Álvaro Herrera
Discussion: https://postgr.es/m/87sh71cakz.fsf@ars-thinkpad
This commit is contained in:
Alvaro Herrera 2018-05-14 13:09:32 -04:00
parent fc2a41e23e
commit 4eaa537275
3 changed files with 38 additions and 11 deletions
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36
src/backend/tcop/utility.c
View File

@ -67,6 +67,7 @@
#include "tcop/utility.h"
#include "utils/acl.h"
#include "utils/guc.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
#include "utils/rel.h"
@ -1287,7 +1288,6 @@ ProcessUtilitySlow(ParseState *pstate,
IndexStmt *stmt = (IndexStmt *) parsetree;
Oid relid;
LOCKMODE lockmode;
List *inheritors = NIL;
if (stmt->concurrent)
PreventInTransactionBlock(isTopLevel,
@ -1314,17 +1314,33 @@ ProcessUtilitySlow(ParseState *pstate,
* CREATE INDEX on partitioned tables (but not regular
* inherited tables) recurses to partitions, so we must
* acquire locks early to avoid deadlocks.
*
* We also take the opportunity to verify that all
* partitions are something we can put an index on,
* to avoid building some indexes only to fail later.
*/
if (stmt->relation->inh)
if (stmt->relation->inh &&
get_rel_relkind(relid) == RELKIND_PARTITIONED_TABLE)
{
Relation rel;
ListCell *lc;
List *inheritors = NIL;
/* already locked by RangeVarGetRelidExtended */
rel = heap_open(relid, NoLock);
if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
inheritors = find_all_inheritors(relid, lockmode,
NULL);
heap_close(rel, NoLock);
inheritors = find_all_inheritors(relid, lockmode, NULL);
foreach(lc, inheritors)
{
char relkind = get_rel_relkind(lfirst_oid(lc));
if (relkind != RELKIND_RELATION &&
relkind != RELKIND_MATVIEW &&
relkind != RELKIND_PARTITIONED_TABLE)
ereport(ERROR,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("cannot create index on partitioned table \"%s\"",
stmt->relation->relname),
errdetail("Table \"%s\" contains partitions that are foreign tables.",
stmt->relation->relname)));
}
list_free(inheritors);
}
/* Run parse analysis ... */
@ -1353,8 +1369,6 @@ ProcessUtilitySlow(ParseState *pstate,
parsetree);
commandCollected = true;
EventTriggerAlterTableEnd();
list_free(inheritors);
}
break;

7
src/test/regress/expected/foreign_data.out
View File

@ -749,6 +749,13 @@ SELECT * FROM ft1; -- ERROR
ERROR: foreign-data wrapper "dummy" has no handler
EXPLAIN SELECT * FROM ft1; -- ERROR
ERROR: foreign-data wrapper "dummy" has no handler
CREATE TABLE lt1 (a INT) PARTITION BY RANGE (a);
CREATE FOREIGN TABLE ft_part1
PARTITION OF lt1 FOR VALUES FROM (0) TO (1000) SERVER s0;
CREATE INDEX ON lt1 (a); -- ERROR
ERROR: cannot create index on partitioned table "lt1"
DETAIL: Table "lt1" contains partitions that are foreign tables.
DROP TABLE lt1;
-- ALTER FOREIGN TABLE
COMMENT ON FOREIGN TABLE ft1 IS 'foreign table';
COMMENT ON FOREIGN TABLE ft1 IS NULL;

6
src/test/regress/sql/foreign_data.sql
View File

@ -316,6 +316,12 @@ CREATE INDEX id_ft1_c2 ON ft1 (c2); -- ERROR
SELECT * FROM ft1; -- ERROR
EXPLAIN SELECT * FROM ft1; -- ERROR
CREATE TABLE lt1 (a INT) PARTITION BY RANGE (a);
CREATE FOREIGN TABLE ft_part1
PARTITION OF lt1 FOR VALUES FROM (0) TO (1000) SERVER s0;
CREATE INDEX ON lt1 (a); -- ERROR
DROP TABLE lt1;
-- ALTER FOREIGN TABLE
COMMENT ON FOREIGN TABLE ft1 IS 'foreign table';
COMMENT ON FOREIGN TABLE ft1 IS NULL;