On 2019/01/24 6:10, Alvaro Herrera wrote:
> Hello
>
> On 2019-Jan-23, Amit Langote wrote:
>
>> It seems that ATExecDetachPartition misses to mark a child's primary key
>> constraint entry (if any) as local (conislocal=true, coninhcount=0), which
>> causes this:
>>
>> create table p (a int primary key) partition by list (a);
>> create table p2 partition of p for values in (2);
>> alter table p detach partition p2;
>> alter table p2 drop constraint p2_pkey ;
>> ERROR: cannot drop inherited constraint "p2_pkey" of relation "p2"
>
> Ugh.
>
> I suppose unique keys would have the same problem, so the check for
> indisprimary is wrong.
Fixed in the attached. We don't support inheriting EXCLUSION constraints
yet, so no need to consider their indexes.
Thanks,
Amit
From d794906e8d2a0839f548f20be5817f306b833b15 Mon Sep 17 00:00:00 2001
From: amit <amitlangot...@gmail.com>
Date: Wed, 23 Jan 2019 18:33:09 +0900
Subject: [PATCH v2] Detach primary key constraint when detaching partition
---
src/backend/commands/tablecmds.c | 16 ++++++++++++++++
src/test/regress/expected/indexing.out | 15 +++++++++++++++
src/test/regress/sql/indexing.sql | 14 ++++++++++++++
3 files changed, 45 insertions(+)
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 28a137bb53..e3baf73e7b 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -15094,6 +15094,7 @@ ATExecDetachPartition(Relation rel, RangeVar *name)
foreach(cell, indexes)
{
Oid idxid = lfirst_oid(cell);
+ Oid constrOid;
Relation idx;
if (!has_superclass(idxid))
@@ -15106,6 +15107,21 @@ 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.
+ */
+ 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 %u of
%u",
+ idxid, RelationGetRelid(partRel));
+
+ ConstraintSetParentConstraint(constrOid, InvalidOid);
}
table_close(classRel, RowExclusiveLock);
diff --git a/src/test/regress/expected/indexing.out
b/src/test/regress/expected/indexing.out
index 118f2c78df..b344351ee7 100644
--- a/src/test/regress/expected/indexing.out
+++ b/src/test/regress/expected/indexing.out
@@ -1414,3 +1414,18 @@ 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;
diff --git a/src/test/regress/sql/indexing.sql
b/src/test/regress/sql/indexing.sql
index d4a64c18c7..3d43a57da2 100644
--- a/src/test/regress/sql/indexing.sql
+++ b/src/test/regress/sql/indexing.sql
@@ -757,3 +757,17 @@ 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;
--
2.11.0
