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Commitcabad37

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> Huh, I don't know where I got the idea you were (or someone else was?)
> in the position that attislocal should be reset. I'll clean everything> up and submit the patch I had originally made.All right, this is it. This patch merely checks if child tables havethe column. If atttypid and atttypmod are the same, the attributes'attinhcount is incremented; else the operation is aborted. If childtables don't have the column, recursively add it.attislocal is not touched in any case.Alvaro Herrera
1 parentbab3d29 commitcabad37

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+38
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1 file changed

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‎src/backend/commands/tablecmds.c‎

Lines changed: 38 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $Header: /cvsroot/pgsql/src/backend/commands/tablecmds.c,v 1.45 2002/09/28 20:00:19 tgl Exp $
11+
* $Header: /cvsroot/pgsql/src/backend/commands/tablecmds.c,v 1.46 2002/10/19 02:09:45 momjian Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -1643,22 +1643,53 @@ AlterTableAddColumn(Oid myrelid,
16431643
colDefChild->inhcount=1;
16441644
colDefChild->is_local= false;
16451645

1646-
/*this routine is actually in the planner */
1647-
children=find_all_inheritors(myrelid);
1646+
/*we only need direct inheritors */
1647+
children=find_inheritance_children(myrelid);
16481648

16491649
/*
1650-
* find_all_inheritors does the recursive search of the
1651-
* inheritance hierarchy, so all we have to do is process all of
1652-
* the relids in the list that it returns.
1650+
* If the child has a column with same name and type,
1651+
* increment its attinhcount and continue. If it has
1652+
* different type, abort. If it doesn't have a column
1653+
* with the same name, add it.
16531654
*/
16541655
foreach(child,children)
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{
16561657
Oidchildrelid=lfirsti(child);
1658+
HeapTupletuple;
1659+
Form_pg_attributechildatt;
16571660

16581661
if (childrelid==myrelid)
16591662
continue;
16601663

1661-
AlterTableAddColumn(childrelid, false, true,colDefChild);
1664+
attrdesc=heap_openr(AttributeRelationName,RowExclusiveLock);
1665+
tuple=SearchSysCacheCopyAttName(childrelid,colDef->colname);
1666+
if (!HeapTupleIsValid(tuple))
1667+
{
1668+
heap_close(attrdesc,RowExclusiveLock);
1669+
AlterTableAddColumn(childrelid, false, true,colDefChild);
1670+
continue;
1671+
}
1672+
childatt= (Form_pg_attribute)GETSTRUCT(tuple);
1673+
1674+
typeTuple=typenameType(colDef->typename);
1675+
tform= (Form_pg_type)GETSTRUCT(typeTuple);
1676+
1677+
if (HeapTupleGetOid(typeTuple)!=childatt->atttypid||
1678+
colDef->typename->typemod!=childatt->atttypmod)
1679+
elog(ERROR,"ALTER TABLE: child table %u has different "
1680+
"type for column \"%s\"",
1681+
childrelid,colDef->colname);
1682+
1683+
childatt->attinhcount++;
1684+
simple_heap_update(attrdesc,&tuple->t_self,tuple);
1685+
CatalogUpdateIndexes(attrdesc,tuple);
1686+
1687+
elog(NOTICE,"ALTER TABLE: merging definition of column "
1688+
"\"%s\" for child %u",colDef->colname,childrelid);
1689+
1690+
heap_close(attrdesc,RowExclusiveLock);
1691+
heap_freetuple(tuple);
1692+
ReleaseSysCache(typeTuple);
16621693
}
16631694
}
16641695
else

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