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pg_upgrade: use CTE query rather than temp table 

Now that 8.3 is not supported, we can use a CTE and not temp tables.
This allows for auto-oid assignment protection in a future patch.
This commit is contained in:
Bruce Momjian 2014-08-25 21:22:08 -04:00
parent e8c81b1b8e
commit 5d16332e96
1 changed files with 67 additions and 63 deletions
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130
contrib/pg_upgrade/info.c
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@ -320,71 +320,75 @@ get_rel_infos(ClusterInfo *cluster, DbInfo *dbinfo)
*/
snprintf(query, sizeof(query),
"CREATE TEMPORARY TABLE info_rels (reloid) AS SELECT c.oid "
"FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n "
" ON c.relnamespace = n.oid "
"LEFT OUTER JOIN pg_catalog.pg_index i "
" ON c.oid = i.indexrelid "
"WHERE relkind IN ('r', 'm', 'i', 'S') AND "
/*
* pg_dump only dumps valid indexes; testing indisready is necessary in
* 9.2, and harmless in earlier/later versions.
*/
" i.indisvalid IS DISTINCT FROM false AND "
" i.indisready IS DISTINCT FROM false AND "
/* exclude possible orphaned temp tables */
" ((n.nspname !~ '^pg_temp_' AND "
" n.nspname !~ '^pg_toast_temp_' AND "
/* skip pg_toast because toast index have relkind == 'i', not 't' */
" n.nspname NOT IN ('pg_catalog', 'information_schema', "
" 'binary_upgrade', 'pg_toast') AND "
" c.oid >= %u) "
" OR (n.nspname = 'pg_catalog' AND "
" relname IN ('pg_largeobject', 'pg_largeobject_loid_pn_index'%s) ));",
FirstNormalObjectId,
/* does pg_largeobject_metadata need to be migrated? */
(GET_MAJOR_VERSION(old_cluster.major_version) <= 804) ?
"" : ", 'pg_largeobject_metadata', 'pg_largeobject_metadata_oid_index'");
PQclear(executeQueryOrDie(conn, "%s", query));
/*
* Get TOAST tables and indexes; we have to gather the TOAST tables in
* later steps because we can't schema-qualify TOAST tables.
*/
PQclear(executeQueryOrDie(conn,
"INSERT INTO info_rels "
"SELECT reltoastrelid "
"FROM info_rels i JOIN pg_catalog.pg_class c "
" ON i.reloid = c.oid "
" AND c.reltoastrelid != %u", InvalidOid));
PQclear(executeQueryOrDie(conn,
"INSERT INTO info_rels "
"SELECT indexrelid "
"FROM pg_index "
"WHERE indisvalid "
" AND indrelid IN (SELECT reltoastrelid "
" FROM info_rels i "
" JOIN pg_catalog.pg_class c "
" ON i.reloid = c.oid "
" AND c.reltoastrelid != %u)",
InvalidOid));
snprintf(query, sizeof(query),
"SELECT c.oid, n.nspname, c.relname, "
" c.relfilenode, c.reltablespace, %s "
"FROM info_rels i JOIN pg_catalog.pg_class c "
" ON i.reloid = c.oid "
" JOIN pg_catalog.pg_namespace n "
" ON c.relnamespace = n.oid "
" LEFT OUTER JOIN pg_catalog.pg_tablespace t "
" ON c.reltablespace = t.oid "
/* get regular heap */
"WITH regular_heap (reloid) AS ( "
" SELECT c.oid "
" FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n "
" ON c.relnamespace = n.oid "
" LEFT OUTER JOIN pg_catalog.pg_index i "
" ON c.oid = i.indexrelid "
" WHERE relkind IN ('r', 'm', 'i', 'S') AND "
/*
* pg_dump only dumps valid indexes; testing indisready is necessary in
* 9.2, and harmless in earlier/later versions.
*/
" i.indisvalid IS DISTINCT FROM false AND "
" i.indisready IS DISTINCT FROM false AND "
/* exclude possible orphaned temp tables */
" ((n.nspname !~ '^pg_temp_' AND "
" n.nspname !~ '^pg_toast_temp_' AND "
/* skip pg_toast because toast index have relkind == 'i', not 't' */
" n.nspname NOT IN ('pg_catalog', 'information_schema', "
" 'binary_upgrade', 'pg_toast') AND "
" c.oid >= %u) OR "
" (n.nspname = 'pg_catalog' AND "
" relname IN ('pg_largeobject', 'pg_largeobject_loid_pn_index'%s) ))), "
/*
* We have to gather the TOAST tables in later steps because we
* can't schema-qualify TOAST tables.
*/
/* get TOAST heap */
" toast_heap (reloid) AS ( "
" SELECT reltoastrelid "
" FROM regular_heap JOIN pg_catalog.pg_class c "
" ON regular_heap.reloid = c.oid "
" AND c.reltoastrelid != %u), "
/* get indexes on regular and TOAST heap */
" all_index (reloid) AS ( "
" SELECT indexrelid "
" FROM pg_index "
" WHERE indisvalid "
" AND indrelid IN (SELECT reltoastrelid "
" FROM (SELECT reloid FROM regular_heap "
" UNION ALL "
" SELECT reloid FROM toast_heap) all_heap "
" JOIN pg_catalog.pg_class c "
" ON all_heap.reloid = c.oid "
" AND c.reltoastrelid != %u)) "
/* get all rels */
"SELECT c.oid, n.nspname, c.relname, "
" c.relfilenode, c.reltablespace, %s "
"FROM (SELECT reloid FROM regular_heap "
" UNION ALL "
" SELECT reloid FROM toast_heap "
" UNION ALL "
" SELECT reloid FROM all_index) all_rels "
" JOIN pg_catalog.pg_class c "
" ON all_rels.reloid = c.oid "
" JOIN pg_catalog.pg_namespace n "
" ON c.relnamespace = n.oid "
" LEFT OUTER JOIN pg_catalog.pg_tablespace t "
" ON c.reltablespace = t.oid "
/* we preserve pg_class.oid so we sort by it to match old/new */
"ORDER BY 1;",
"ORDER BY 1;",
FirstNormalObjectId,
/* does pg_largeobject_metadata need to be migrated? */
(GET_MAJOR_VERSION(old_cluster.major_version) <= 804) ?
"" : ", 'pg_largeobject_metadata', 'pg_largeobject_metadata_oid_index'",
InvalidOid, InvalidOid,
/* 9.2 removed the spclocation column */
(GET_MAJOR_VERSION(cluster->major_version) <= 901) ?
"t.spclocation" : "pg_catalog.pg_tablespace_location(t.oid) AS spclocation");
(GET_MAJOR_VERSION(cluster->major_version) <= 901) ?
"t.spclocation" : "pg_catalog.pg_tablespace_location(t.oid) AS spclocation");
res = executeQueryOrDie(conn, "%s", query);