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Detach constraints when partitions are detached 

I (Álvaro) forgot to do this in eb7ed3f306, leading to undroppable
constraints after partitions are detached.  Repair.

Reported-by: Amit Langote
Author: Amit Langote
Discussion: https://postgr.es/m/c1c9b688-b886-84f7-4048-1e4ebe9b1d06@lab.ntt.co.jp
This commit is contained in:
Alvaro Herrera 2019-01-23 23:57:46 -03:00
parent 0359d83212
commit 00376eaa2e
3 changed files with 47 additions and 0 deletions
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18
src/backend/commands/tablecmds.c
View File

@ -15233,6 +15233,7 @@ ATExecDetachPartition(Relation rel, RangeVar *name)
{
Oid idxid = lfirst_oid(cell);
Relation idx;
Oid constrOid;
if (!has_superclass(idxid))
continue;
@ -15244,6 +15245,23 @@ ATExecDetachPartition(Relation rel, RangeVar *name)
IndexSetParentIndex(idx, InvalidOid);
update_relispartition(classRel, idxid, false);
index_close(idx, NoLock);
/*
* Detach any constraints associated with the index too. Only UNIQUE
* and PRIMARY KEY index constraints can be inherited, so no need
* to check for others.
*/
if (!idx->rd_index->indisprimary && !idx->rd_index->indisunique)
continue;
constrOid = get_relation_idx_constraint_oid(RelationGetRelid(partRel),
idxid);
if (!OidIsValid(constrOid))
elog(ERROR, "missing pg_constraint entry of index \"%s\" of partition \"%s\"",
RelationGetRelationName(idx),
RelationGetRelationName(partRel));
ConstraintSetParentConstraint(constrOid, InvalidOid);
}
heap_close(classRel, RowExclusiveLock);

15
src/test/regress/expected/indexing.out
View File

@ -1387,3 +1387,18 @@ DETAIL: Key (a)=(4) already exists.
create unique index on covidxpart (b) include (a); -- should fail
ERROR: insufficient columns in UNIQUE constraint definition
DETAIL: UNIQUE constraint on table "covidxpart" lacks column "a" which is part of the partition key.
-- check that detaching a partition also detaches the primary key constraint
create table parted_pk_detach_test (a int primary key) partition by list (a);
create table parted_pk_detach_test1 partition of parted_pk_detach_test for values in (1);
alter table parted_pk_detach_test1 drop constraint parted_pk_detach_test1_pkey; -- should fail
ERROR: cannot drop inherited constraint "parted_pk_detach_test1_pkey" of relation "parted_pk_detach_test1"
alter table parted_pk_detach_test detach partition parted_pk_detach_test1;
alter table parted_pk_detach_test1 drop constraint parted_pk_detach_test1_pkey;
drop table parted_pk_detach_test, parted_pk_detach_test1;
create table parted_uniq_detach_test (a int unique) partition by list (a);
create table parted_uniq_detach_test1 partition of parted_uniq_detach_test for values in (1);
alter table parted_uniq_detach_test1 drop constraint parted_uniq_detach_test1_a_key; -- should fail
ERROR: cannot drop inherited constraint "parted_uniq_detach_test1_a_key" of relation "parted_uniq_detach_test1"
alter table parted_uniq_detach_test detach partition parted_uniq_detach_test1;
alter table parted_uniq_detach_test1 drop constraint parted_uniq_detach_test1_a_key;
drop table parted_uniq_detach_test, parted_uniq_detach_test1;

14
src/test/regress/sql/indexing.sql
View File

@ -740,3 +740,17 @@ alter table covidxpart attach partition covidxpart4 for values in (4);
insert into covidxpart values (4, 1);
insert into covidxpart values (4, 1);
create unique index on covidxpart (b) include (a); -- should fail
-- check that detaching a partition also detaches the primary key constraint
create table parted_pk_detach_test (a int primary key) partition by list (a);
create table parted_pk_detach_test1 partition of parted_pk_detach_test for values in (1);
alter table parted_pk_detach_test1 drop constraint parted_pk_detach_test1_pkey; -- should fail
alter table parted_pk_detach_test detach partition parted_pk_detach_test1;
alter table parted_pk_detach_test1 drop constraint parted_pk_detach_test1_pkey;
drop table parted_pk_detach_test, parted_pk_detach_test1;
create table parted_uniq_detach_test (a int unique) partition by list (a);
create table parted_uniq_detach_test1 partition of parted_uniq_detach_test for values in (1);
alter table parted_uniq_detach_test1 drop constraint parted_uniq_detach_test1_a_key; -- should fail
alter table parted_uniq_detach_test detach partition parted_uniq_detach_test1;
alter table parted_uniq_detach_test1 drop constraint parted_uniq_detach_test1_a_key;
drop table parted_uniq_detach_test, parted_uniq_detach_test1;