Fix level tracking for older PG versions once again

pg_stat_monitor.c

@@ -1233,6 +1233,8 @@ pgsm_ProcessUtility(PlannedStmt *pstmt, const char *queryString,
 		 * To be absolutely certain we don't mess up the nesting level,
 		 * evaluate the bump_level condition just once.
 		 */
+
+#if PG_VERSION_NUM >= 170000
 		bool		bump_level =
 			!IsA(parsetree, ExecuteStmt) &&
 			!IsA(parsetree, PrepareStmt) &&
@@ -1243,6 +1245,7 @@ pgsm_ProcessUtility(PlannedStmt *pstmt, const char *queryString,
 
 		PG_TRY();
 		{
+#endif
 #if PG_VERSION_NUM >= 140000
 			if (prev_ProcessUtility)
 				prev_ProcessUtility(pstmt, queryString,
@@ -1279,6 +1282,7 @@ pgsm_ProcessUtility(PlannedStmt *pstmt, const char *queryString,
 										dest,
 										completionTag);
 #endif
+#if PG_VERSION_NUM >= 170000
 			if (bump_level)
 				nesting_level--;
 		}
@@ -1289,6 +1293,7 @@ pgsm_ProcessUtility(PlannedStmt *pstmt, const char *queryString,
 			PG_RE_THROW();
 		}
 		PG_END_TRY();
+#endif
 	}
 }
 

regression/expected/level_tracking_1.out

@@ -96,9 +96,10 @@ SELECT toplevel, calls, query FROM pg_stat_monitor
   ORDER BY query COLLATE "C", toplevel;
  toplevel | calls |             query              
 ----------+-------+--------------------------------
- t        |     1 | DELETE FROM stats_track_tab
+ t        |     2 | DELETE FROM stats_track_tab
+ t        |     1 | SELECT $1::TEXT
  t        |     1 | SELECT pg_stat_monitor_reset()
-(2 rows)
+(3 rows)
 
 -- DO block - all-level tracking without utility.
 SET pg_stat_monitor.pgsm_track = 'all';
@@ -122,11 +123,10 @@ SELECT toplevel, calls, query FROM pg_stat_monitor
   ORDER BY query COLLATE "C", toplevel;
  toplevel | calls |             query              
 ----------+-------+--------------------------------
- f        |     1 | DELETE FROM stats_track_tab
- t        |     1 | DELETE FROM stats_track_tab
- f        |     1 | SELECT $1::TEXT
+ t        |     2 | DELETE FROM stats_track_tab
+ t        |     1 | SELECT $1::TEXT
  t        |     1 | SELECT pg_stat_monitor_reset()
-(4 rows)
+(3 rows)
 
 -- PL/pgSQL function - top-level tracking.
 SET pg_stat_monitor.pgsm_track = 'top';