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Commitf64554b

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Handle OID column inheritance correctly in ALTER TABLE ... INHERIT.
Inheritance operations must treat the OID column, if any, much likeregular user columns. But MergeAttributesIntoExisting() neglected todo that, leading to weird results after a table with OIDs is associatedto a parent with OIDs via ALTER TABLE ... INHERIT.Report and patch by Amit Langote, reviewed by Ashutosh Bapat, someadjustments by me. It's been broken all along, so back-patch toall supported branches.Discussion:https://postgr.es/m/cb13cfe7-a48c-5720-c383-bb843ab28298@lab.ntt.co.jp
1 parent6e5de70 commitf64554b

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3 files changed

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3 files changed

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‎src/backend/commands/tablecmds.c

Lines changed: 33 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -10329,6 +10329,39 @@ MergeAttributesIntoExisting(Relation child_rel, Relation parent_rel)
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}
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}
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/*
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* If the parent has an OID column, so must the child, and we'd better
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* update the child's attinhcount and attislocal the same as for normal
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* columns. We needn't check data type or not-nullness though.
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*/
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if (tupleDesc->tdhasoid)
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{
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/*
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* Here we match by column number not name; the match *must* be the
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* system column, not some random column named "oid".
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*/
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tuple=SearchSysCacheCopy2(ATTNUM,
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ObjectIdGetDatum(RelationGetRelid(child_rel)),
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Int16GetDatum(ObjectIdAttributeNumber));
10346+
if (HeapTupleIsValid(tuple))
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{
10348+
Form_pg_attributechildatt= (Form_pg_attribute)GETSTRUCT(tuple);
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/* See comments above; these changes should be the same */
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childatt->attinhcount++;
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simple_heap_update(attrrel,&tuple->t_self,tuple);
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CatalogUpdateIndexes(attrrel,tuple);
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heap_freetuple(tuple);
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}
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else
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{
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ereport(ERROR,
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(errcode(ERRCODE_DATATYPE_MISMATCH),
10360+
errmsg("child table is missing column \"%s\"",
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"oid")));
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}
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}
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heap_close(attrrel,RowExclusiveLock);
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}
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‎src/test/regress/expected/inherit.out

Lines changed: 49 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -612,6 +612,55 @@ select * from d;
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32 | one | two | three
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(1 row)
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-- check that oid column is handled properly during alter table inherit
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create table oid_parent (a int) with oids;
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create table oid_child () inherits (oid_parent);
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select attinhcount, attislocal from pg_attribute
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where attrelid = 'oid_child'::regclass and attname = 'oid';
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attinhcount | attislocal
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-------------+------------
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1 | f
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(1 row)
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drop table oid_child;
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create table oid_child (a int) without oids;
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alter table oid_child inherit oid_parent; -- fail
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ERROR: table "oid_child" without OIDs cannot inherit from table "oid_parent" with OIDs
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alter table oid_child set with oids;
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select attinhcount, attislocal from pg_attribute
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where attrelid = 'oid_child'::regclass and attname = 'oid';
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attinhcount | attislocal
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-------------+------------
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0 | t
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(1 row)
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alter table oid_child inherit oid_parent;
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select attinhcount, attislocal from pg_attribute
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where attrelid = 'oid_child'::regclass and attname = 'oid';
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attinhcount | attislocal
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-------------+------------
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1 | t
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(1 row)
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alter table oid_child set without oids; -- fail
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ERROR: cannot drop inherited column "oid"
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alter table oid_parent set without oids;
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select attinhcount, attislocal from pg_attribute
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where attrelid = 'oid_child'::regclass and attname = 'oid';
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attinhcount | attislocal
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-------------+------------
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0 | t
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(1 row)
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alter table oid_child set without oids;
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select attinhcount, attislocal from pg_attribute
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where attrelid = 'oid_child'::regclass and attname = 'oid';
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attinhcount | attislocal
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-------------+------------
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(0 rows)
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drop table oid_parent cascade;
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NOTICE: drop cascades to table oid_child
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-- Test non-inheritable parent constraints
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create table p1(ff1 int);
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alter table p1 add constraint p1chk check (ff1 > 0) no inherit;

‎src/test/regress/sql/inherit.sql

Lines changed: 26 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -145,6 +145,32 @@ insert into d values('test','one','two','three');
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altertable a alter column aa typeinteger using bit_length(aa);
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select*from d;
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-- check that oid column is handled properly during alter table inherit
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createtableoid_parent (aint) with oids;
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createtableoid_child () inherits (oid_parent);
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select attinhcount, attislocalfrom pg_attribute
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where attrelid='oid_child'::regclassand attname='oid';
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droptable oid_child;
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createtableoid_child (aint) without oids;
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altertable oid_child inherit oid_parent;-- fail
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altertable oid_childset with oids;
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select attinhcount, attislocalfrom pg_attribute
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where attrelid='oid_child'::regclassand attname='oid';
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altertable oid_child inherit oid_parent;
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select attinhcount, attislocalfrom pg_attribute
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where attrelid='oid_child'::regclassand attname='oid';
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altertable oid_childset without oids;-- fail
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altertable oid_parentset without oids;
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select attinhcount, attislocalfrom pg_attribute
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where attrelid='oid_child'::regclassand attname='oid';
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altertable oid_childset without oids;
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select attinhcount, attislocalfrom pg_attribute
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where attrelid='oid_child'::regclassand attname='oid';
171+
172+
droptable oid_parent cascade;
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-- Test non-inheritable parent constraints
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createtablep1(ff1int);
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altertable p1 addconstraint p1chkcheck (ff1>0) no inherit;

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