Bugfix in ALTER TABLE CREATE TOAST TABLE

Automatically create toast table at CREATE TABLE if new table
has toastable attributes.

Jan

diff --git a/src/backend/commands/command.c b/src/backend/commands/command.c
index 19c8710..bb77fdf 100644 (file)
--- a/src/backend/commands/command.c
+++ b/src/backend/commands/command.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *       $Header: /cvsroot/pgsql/src/backend/commands/Attic/command.c,v 1.83 2000/07/04 06:11:27 tgl Exp $
+ *       $Header: /cvsroot/pgsql/src/backend/commands/Attic/command.c,v 1.84 2000/07/05 12:45:25 wieck Exp $
  *
  * NOTES
  *       The PerformAddAttribute() code, like most of the relation
@@ -1177,21 +1177,23 @@ AlterTableDropConstraint(const char *relationName,
  * ALTER TABLE CREATE TOAST TABLE
  */
 void
-AlterTableCreateToastTable(const char *relationName)
+AlterTableCreateToastTable(const char *relationName, bool silent)
 {
        Relation                        rel;
        Oid                                     myrelid;
        HeapTuple                       reltup;
+       HeapTupleData           classtuple;
        TupleDesc                       tupdesc;
        Form_pg_attribute  *att;
        Relation                        class_rel;
+       Buffer                          buffer;
        Relation                        ridescs[Num_pg_class_indices];
        Oid                                     toast_relid;
        Oid                                     toast_idxid;
        bool                            has_toastable_attrs = false;
        int                                     i;
-       char                            toast_relname[NAMEDATALEN];
-       char                            toast_idxname[NAMEDATALEN];
+       char                            toast_relname[NAMEDATALEN + 1];
+       char                            toast_idxname[NAMEDATALEN + 1];
        Relation                        toast_rel;
        AttrNumber                      attNums[1];
        Oid                                     classObjectId[1];
@@ -1199,17 +1201,34 @@ AlterTableCreateToastTable(const char *relationName)
        /*
         * permissions checking.  XXX exactly what is appropriate here?
         */
-/*
-       if (!allowSystemTableMods && IsSystemRelationName(relationName))
-               elog(ERROR, "ALTER TABLE: relation \"%s\" is a system catalog",
-                        relationName);
-*/
 #ifndef NO_SECURITY
        if (!pg_ownercheck(UserName, relationName, RELNAME))
                elog(ERROR, "ALTER TABLE: permission denied");
 #endif
 
        /*
+        * lock the pg_class tuple for update
+        */
+       reltup = SearchSysCacheTuple(RELNAME, PointerGetDatum(relationName),
+                                                                0, 0, 0);
+
+       if (!HeapTupleIsValid(reltup))
+               elog(ERROR, "ALTER TABLE: relation \"%s\" not found",
+                        relationName);
+       class_rel = heap_openr(RelationRelationName, RowExclusiveLock);
+       classtuple.t_self = reltup->t_self;
+       switch (heap_mark4update(class_rel, &classtuple, &buffer))
+       {
+               case HeapTupleSelfUpdated:
+               case HeapTupleMayBeUpdated:
+                       break;
+               default:
+                       elog(ERROR, "couldn't lock pg_class tuple");
+       }
+       reltup = heap_copytuple(&classtuple);
+       ReleaseBuffer(buffer);
+
+       /*
         * Grab an exclusive lock on the target table, which we will NOT
         * release until end of transaction.
         */
@@ -1231,22 +1250,24 @@ AlterTableCreateToastTable(const char *relationName)
        }
 
        if (!has_toastable_attrs)
+       {
+           if (silent)
+               {
+                       heap_close(rel, NoLock);
+                       heap_close(class_rel, NoLock);
+                       return;
+               }
+
                elog(ERROR, "ALTER TABLE: relation \"%s\" has no toastable attributes",
                                relationName);
+       }
 
-       /*
-        * Get the pg_class tuple for the relation
-        */
-       reltup = SearchSysCacheTuple(RELNAME,
-                                                                PointerGetDatum(relationName),
-                                                                0, 0, 0);
-
-       if (!HeapTupleIsValid(reltup))
-               elog(ERROR, "ALTER TABLE: relation \"%s\" not found",
-                        relationName);
 
        /*
-        * XXX is the following check sufficient?
+        * XXX is the following check sufficient? At least it would
+        * allow to create TOAST tables for views. But why not - someone
+        * can insert into a view, so it shouldn't be impossible to hide
+        * huge data there :-)
         */
        if (((Form_pg_class) GETSTRUCT(reltup))->relkind != RELKIND_RELATION)
        {
@@ -1281,6 +1302,8 @@ AlterTableCreateToastTable(const char *relationName)
 
        /* XXX use RELKIND_TOASTVALUE here? */
        /* XXX what if owning relation is temp?  need we mark toasttable too? */
+       /* !!! No need to worry about temp. It'll go away when it's master    */
+       /*     table is deleted. Jan                                          */
        heap_create_with_catalog(toast_relname, tupdesc, RELKIND_RELATION,
                                                         false, true);
 
@@ -1308,32 +1331,22 @@ AlterTableCreateToastTable(const char *relationName)
        index_close(toast_rel);
 
        /*
-        * Get the pg_class tuple for the relation
-        */
-       class_rel = heap_openr(RelationRelationName, RowExclusiveLock);
-
-       reltup = SearchSysCacheTupleCopy(RELNAME,
-                                                                        PointerGetDatum(relationName),
-                                                                        0, 0, 0);
-       if (!HeapTupleIsValid(reltup))
-               elog(ERROR, "ALTER TABLE: relation \"%s\" not found",
-                        relationName);
-
-       /*
         * Store the toast table- and index-Oid's in the relation tuple
         */
        ((Form_pg_class) GETSTRUCT(reltup))->reltoastrelid = toast_relid;
        ((Form_pg_class) GETSTRUCT(reltup))->reltoastidxid = toast_idxid;
        heap_update(class_rel, &reltup->t_self, reltup, NULL);
 
-       /* keep catalog indices current */
+       /*
+        * Keep catalog indices current
+        */
        CatalogOpenIndices(Num_pg_class_indices, Name_pg_class_indices, ridescs);
-       CatalogIndexInsert(ridescs, Num_pg_class_indices, rel, reltup);
+       CatalogIndexInsert(ridescs, Num_pg_class_indices, class_rel, reltup);
        CatalogCloseIndices(Num_pg_class_indices, ridescs);
 
        heap_freetuple(reltup);
 
-       heap_close(class_rel, RowExclusiveLock);
+       heap_close(class_rel, NoLock);
        heap_close(rel, NoLock);
 }
 

diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 17c77da..409aca7 100644 (file)
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -10,7 +10,7 @@
  *
  *
  * IDENTIFICATION
- *       $Header: /cvsroot/pgsql/src/backend/tcop/utility.c,v 1.90 2000/07/03 23:09:46 wieck Exp $
+ *       $Header: /cvsroot/pgsql/src/backend/tcop/utility.c,v 1.91 2000/07/05 12:45:26 wieck Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -159,6 +159,15 @@ ProcessUtility(Node *parsetree,
                        CHECK_IF_ABORTED();
 
                        DefineRelation((CreateStmt *) parsetree, RELKIND_RELATION);
+
+                       /*
+                        * Let AlterTableCreateToastTable decide if this
+                        * one needs a secondary relation too.
+                        *
+                        */
+                       CommandCounterIncrement();
+                       AlterTableCreateToastTable(((CreateStmt *)parsetree)->relname,
+                                                                               true);
                        break;
 
                case T_DropStmt:
@@ -361,7 +370,7 @@ ProcessUtility(Node *parsetree,
                                                AlterTableDropConstraint(stmt->relname, stmt->inh, stmt->name, stmt->behavior);
                                                break;
                                        case 'E':       /* CREATE TOAST TABLE */
-                                               AlterTableCreateToastTable(stmt->relname);
+                                               AlterTableCreateToastTable(stmt->relname, false);
                                                break;
                                        default:        /* oops */
                                                elog(ERROR, "T_AlterTableStmt: unknown subtype");

diff --git a/src/include/commands/command.h b/src/include/commands/command.h
index e870126..b2b3d63 100644 (file)
--- a/src/include/commands/command.h
+++ b/src/include/commands/command.h
@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: command.h,v 1.20 2000/07/03 23:10:10 wieck Exp $
+ * $Id: command.h,v 1.21 2000/07/05 12:45:31 wieck Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -58,7 +58,8 @@ extern void AlterTableDropConstraint(const char *relationName,
                                                 bool inh, const char *constrName,
                                                 int behavior);
 
-extern void AlterTableCreateToastTable(const char *relationName);
+extern void AlterTableCreateToastTable(const char *relationName,
+                         bool silent);
 
 /*
  * LOCK