Drop support for Postgres < 12

Author: Sergey Shinderuk

Diff for: .travis.yml

@@ -7,7 +7,6 @@ env:
 - PG_MAJOR=14
 - PG_MAJOR=13
 - PG_MAJOR=12
-- PG_MAJOR=11
 before_script:
 - curl https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
 - echo "deb https://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" | sudo tee -a /etc/apt/sources.list

Diff for: README.md

@@ -7,7 +7,7 @@
 Introduction
 ------------
 
-PostgreSQL 9.6+ provides an information about current wait event of particular
+PostgreSQL provides information about current wait event of particular
 process.  However, in order to gather descriptive statistics of server
 behavior user have to sample current wait event multiple times.
 `pg_wait_sampling` is an extension for collecting sampling statistics of wait
@@ -47,7 +47,7 @@ PostgreSQL installation. It is available from
 [github](https://github.com/postgrespro/pg_wait_sampling)
 under the same license as
 [PostgreSQL](http://www.postgresql.org/about/licence/)
-and supports PostgreSQL 9.6+.
+and supports PostgreSQL 12+.
 
 Installation
 ------------
@@ -58,10 +58,10 @@ repository: https://download.postgresql.org/pub/repos/
 Manual build
 ------------
 
-`pg_wait_sampling` is PostgreSQL extension which requires PostgreSQL 9.6 or
+`pg_wait_sampling` is PostgreSQL extension which requires PostgreSQL 12 or
 higher. Before build and install you should ensure following:
 
- * PostgreSQL version is 9.6 or higher.
+ * PostgreSQL version is 12 or higher.
  * You have development package of PostgreSQL installed or you built
    PostgreSQL from source.
  * Your PATH variable is configured so that `pg_config` command available, or

Diff for: collector.c

@@ -423,15 +423,9 @@ pgws_collector_main(Datum main_arg)
 		 * Wait until next sample time or request to do something through
 		 * shared memory.
 		 */
-#if PG_VERSION_NUM >= 100000
 		rc = WaitLatch(&MyProc->procLatch, WL_LATCH_SET | WL_TIMEOUT | WL_POSTMASTER_DEATH,
 				Min(history_period - (int)history_diff,
 					profile_period - (int)profile_diff), PG_WAIT_EXTENSION);
-#else
-		rc = WaitLatch(&MyProc->procLatch, WL_LATCH_SET | WL_TIMEOUT | WL_POSTMASTER_DEATH,
-				Min(history_period - (int)history_diff,
-					profile_period - (int)profile_diff));
-#endif
 
 		if (rc & WL_POSTMASTER_DEATH)
 			proc_exit(1);
@@ -482,7 +476,7 @@ pgws_collector_main(Datum main_arg)
 					default:
 						Assert(false);
 				}
-				shm_mq_detach_compat(mqh, pgws_collector_mq);
+				shm_mq_detach(mqh);
 			}
 			else if (request == PROFILE_RESET)
 			{

Diff for: compat.h

@@ -17,26 +17,6 @@
 #include "storage/shm_mq.h"
 #include "utils/guc_tables.h"
 
-static inline TupleDesc
-CreateTemplateTupleDescCompat(int nattrs, bool hasoid)
-{
-#if PG_VERSION_NUM >= 120000
-	return CreateTemplateTupleDesc(nattrs);
-#else
-	return CreateTemplateTupleDesc(nattrs, hasoid);
-#endif
-}
-
-static inline void
-shm_mq_detach_compat(shm_mq_handle *mqh, shm_mq *mq)
-{
-#if PG_VERSION_NUM >= 100000
-	shm_mq_detach(mqh);
-#else
-	shm_mq_detach(mq);
-#endif
-}
-
 static inline shm_mq_result
 shm_mq_send_compat(shm_mq_handle *mqh, Size nbytes, const void *data,
 				   bool nowait, bool force_flush)
@@ -61,11 +41,9 @@ InitPostgresCompat(const char *in_dbname, Oid dboid,
 #elif PG_VERSION_NUM >= 150000
 	InitPostgres(in_dbname, dboid, username, useroid, load_session_libraries,
 				 override_allow_connections, out_dbname);
-#elif PG_VERSION_NUM >= 110000
+#else
 	InitPostgres(in_dbname, dboid, username, useroid, out_dbname,
 				 override_allow_connections);
-#else
-	InitPostgres(in_dbname, dboid, username, useroid, out_dbname);
 #endif
 }
 

Diff for: pg_wait_sampling.c

@@ -18,9 +18,7 @@
 #include "optimizer/planner.h"
 #include "pgstat.h"
 #include "postmaster/autovacuum.h"
-#if PG_VERSION_NUM >= 120000
 #include "replication/walsender.h"
-#endif
 #include "storage/ipc.h"
 #include "storage/pg_shmem.h"
 #include "storage/procarray.h"
@@ -119,9 +117,7 @@ get_max_procs_count(void)
 	 * Starting with pg12, wal senders aren't part of MaxConnections anymore
 	 * and have to be accounted for.
 	 */
-#if PG_VERSION_NUM >= 120000
 	count += max_wal_senders;
-#endif		/* pg 12+ */
 #endif		/* pg 15- */
 	/* End of MaxBackends calculation. */
 
@@ -331,16 +327,9 @@ pgws_shmem_startup(void)
 	else
 	{
 		toc = shm_toc_attach(PG_WAIT_SAMPLING_MAGIC, pgws);
-
-#if PG_VERSION_NUM >= 100000
 		pgws_collector_hdr = shm_toc_lookup(toc, 0, false);
 		pgws_collector_mq = shm_toc_lookup(toc, 1, false);
 		pgws_proc_queryids = shm_toc_lookup(toc, 2, false);
-#else
-		pgws_collector_hdr = shm_toc_lookup(toc, 0);
-		pgws_collector_mq = shm_toc_lookup(toc, 1);
-		pgws_proc_queryids = shm_toc_lookup(toc, 2);
-#endif
 	}
 
 	shmem_initialized = true;
@@ -366,7 +355,7 @@ static void
 pgws_cleanup_callback(int code, Datum arg)
 {
 	elog(DEBUG3, "pg_wait_sampling cleanup: detaching shm_mq and releasing queue lock");
-	shm_mq_detach_compat(recv_mqh, recv_mq);
+	shm_mq_detach(recv_mqh);
 	LockRelease(&queueTag, ExclusiveLock, false);
 }
 
@@ -463,7 +452,7 @@ pg_wait_sampling_get_current(PG_FUNCTION_ARGS)
 		params->ts = GetCurrentTimestamp();
 
 		funcctx->user_fctx = params;
-		tupdesc = CreateTemplateTupleDescCompat(4, false);
+		tupdesc = CreateTemplateTupleDesc(4);
 		TupleDescInitEntry(tupdesc, (AttrNumber) 1, "pid",
 						   INT4OID, -1, 0);
 		TupleDescInitEntry(tupdesc, (AttrNumber) 2, "type",
@@ -651,7 +640,7 @@ receive_array(SHMRequest request, Size item_size, Size *count)
 	PG_END_ENSURE_ERROR_CLEANUP(pgws_cleanup_callback, 0);
 
 	/* We still have to detach and release lock during normal operation. */
-	shm_mq_detach_compat(recv_mqh, recv_mq);
+	shm_mq_detach(recv_mqh);
 	LockRelease(&queueTag, ExclusiveLock, false);
 
 	return result;
@@ -684,7 +673,7 @@ pg_wait_sampling_get_profile(PG_FUNCTION_ARGS)
 		funcctx->max_calls = profile->count;
 
 		/* Make tuple descriptor */
-		tupdesc = CreateTemplateTupleDescCompat(5, false);
+		tupdesc = CreateTemplateTupleDesc(5);
 		TupleDescInitEntry(tupdesc, (AttrNumber) 1, "pid",
 						   INT4OID, -1, 0);
 		TupleDescInitEntry(tupdesc, (AttrNumber) 2, "type",
@@ -801,7 +790,7 @@ pg_wait_sampling_get_history(PG_FUNCTION_ARGS)
 		funcctx->max_calls = history->count;
 
 		/* Make tuple descriptor */
-		tupdesc = CreateTemplateTupleDescCompat(5, false);
+		tupdesc = CreateTemplateTupleDesc(5);
 		TupleDescInitEntry(tupdesc, (AttrNumber) 1, "pid",
 						   INT4OID, -1, 0);
 		TupleDescInitEntry(tupdesc, (AttrNumber) 2, "sample_ts",
@@ -879,17 +868,6 @@ pgws_planner_hook(Query *parse,
 	if (MyProc)
 	{
 		int i = MyProc - ProcGlobal->allProcs;
-#if PG_VERSION_NUM >= 110000
-		/*
-		 * since we depend on queryId we need to check that its size
-		 * is uint64 as we coded in pg_wait_sampling
-		 */
-		StaticAssertExpr(sizeof(parse->queryId) == sizeof(uint64),
-				"queryId size is not uint64");
-#else
-		StaticAssertExpr(sizeof(parse->queryId) == sizeof(uint32),
-				"queryId size is not uint32");
-#endif
 		if (!pgws_proc_queryids[i])
 			pgws_proc_queryids[i] = parse->queryId;
 
@@ -921,17 +899,6 @@ pgws_ExecutorStart(QueryDesc *queryDesc, int eflags)
 	if (MyProc)
 	{
 		i = MyProc - ProcGlobal->allProcs;
-#if PG_VERSION_NUM >= 110000
-		/*
-		 * since we depend on queryId we need to check that its size
-		 * is uint64 as we coded in pg_wait_sampling
-		 */
-		StaticAssertExpr(sizeof(queryDesc->plannedstmt->queryId) == sizeof(uint64),
-				"queryId size is not uint64");
-#else
-		StaticAssertExpr(sizeof(queryDesc->plannedstmt->queryId) == sizeof(uint32),
-				"queryId size is not uint32");
-#endif
 		if (!pgws_proc_queryids[i])
 			pgws_proc_queryids[i] = queryDesc->plannedstmt->queryId;
 	}

Diff for: pg_wait_sampling.h

@@ -10,12 +10,7 @@
 #ifndef __PG_WAIT_SAMPLING_H__
 #define __PG_WAIT_SAMPLING_H__
 
-#include <postgres.h>
-
-/* Check PostgreSQL version */
-#if PG_VERSION_NUM < 90600
-	#error "You are trying to build pg_wait_sampling with PostgreSQL version lower than 9.6.  Please, check you environment."
-#endif
+#include "postgres.h"
 
 #include "storage/proc.h"
 #include "storage/shm_mq.h"