chore: import upstream snapshot with attribution

2026-07-13 12:32:25 +08:00
commit e014feafe1
2285 changed files with 1131979 additions and 0 deletions
@@ -0,0 +1,52 @@
+--
+-- Check that system tables can be reindexed.
+--
+-- Note that this test currently is not included in the default
+-- schedules, as currently reindexing catalog tables can cause
+-- deadlocks:
+--
+-- * The lock upgrade between the ShareLock acquired for the reindex
+--   and RowExclusiveLock needed for pg_class/pg_index locks can
+--   trigger deadlocks.
+--
+-- * The uniqueness checks performed when reindexing a unique/primary
+--   key index possibly need to wait for the transaction of a
+--   about-to-deleted row in pg_class to commit. That can cause
+--   deadlocks because, in contrast to user tables, locks on catalog
+--   tables are routinely released before commit - therefore the lock
+--   held for reindexing doesn't guarantee that no running transaction
+--   performed modifications in the table underlying the index.
+--
+--   This is particularly problematic as such conflicts can be
+--   triggered even when run in isolation, as a previous session's
+--   temporary table cleanup might still be running (even when the
+--   session ended from a client perspective).
+
+
+-- Check reindexing of whole tables
+REINDEX TABLE pg_class; -- mapped, non-shared, critical
+REINDEX TABLE pg_index; -- non-mapped, non-shared, critical
+REINDEX TABLE pg_operator; -- non-mapped, non-shared, critical
+REINDEX TABLE pg_database; -- mapped, shared, critical
+REINDEX TABLE pg_shdescription; -- mapped, shared non-critical
+
+-- Check that individual system indexes can be reindexed. That's a bit
+-- different from the entire-table case because reindex_relation
+-- treats e.g. pg_class special.
+REINDEX INDEX pg_class_oid_index; -- mapped, non-shared, critical
+REINDEX INDEX pg_class_relname_nsp_index; -- mapped, non-shared, non-critical
+REINDEX INDEX pg_index_indexrelid_index; -- non-mapped, non-shared, critical
+REINDEX INDEX pg_index_indrelid_index; -- non-mapped, non-shared, non-critical
+REINDEX INDEX pg_database_oid_index; -- mapped, shared, critical
+REINDEX INDEX pg_shdescription_o_c_index; -- mapped, shared, non-critical
+
+-- Check the same REINDEX INDEX statements under parallelism.
+BEGIN;
+SET min_parallel_table_scan_size = 0;
+REINDEX INDEX pg_class_oid_index; -- mapped, non-shared, critical
+REINDEX INDEX pg_class_relname_nsp_index; -- mapped, non-shared, non-critical
+REINDEX INDEX pg_index_indexrelid_index; -- non-mapped, non-shared, critical
+REINDEX INDEX pg_index_indrelid_index; -- non-mapped, non-shared, non-critical
+REINDEX INDEX pg_database_oid_index; -- mapped, shared, critical
+REINDEX INDEX pg_shdescription_o_c_index; -- mapped, shared, non-critical
+ROLLBACK;