autovacuum worker should load dolphin.

src/common/backend/utils/init/postinit.cpp

@@ -1685,6 +1685,8 @@ void PostgresInitializer::InitAutoVacWorker()
 
     InitSettings();
 
+    InitExtensionVariable();
+
     FinishInit();
 }
 

src/gausskernel/process/postmaster/autovacuum.cpp

@@ -1355,6 +1355,10 @@ NON_EXEC_STATIC void AutoVacWorkerMain()
         pgstat_report_appname("AutoVacWorker");
         pgstat_report_activity(STATE_IDLE, NULL);
 
+#if (!defined(ENABLE_MULTIPLE_NODES)) && (!defined(ENABLE_PRIVATEGAUSS))
+        LoadSqlPlugin();
+#endif
+
         set_ps_display(dbname, false);
         ereport(GetVacuumLogLevel(), (errmsg("start autovacuum on database \"%s\"", dbname)));
 

src/include/utils/fmgrtab.h

@@ -212,7 +212,7 @@ static_assert(sizeof(NULL) == sizeof(void*), "NULL must be a 8 byte-length point
 
 #define CUR_THR_IS_WORKER() (t_thrd.role == WORKER || t_thrd.role == THREADPOOL_WORKER ||\
     t_thrd.role == STREAM_WORKER || t_thrd.role == THREADPOOL_STREAM || t_thrd.role == WAL_DB_SENDER||\
-    t_thrd.role == PARALLEL_DECODE || t_thrd.role == JOB_WORKER)
+    t_thrd.role == PARALLEL_DECODE || t_thrd.role == JOB_WORKER || t_thrd.role == AUTOVACUUM_WORKER)
 
 #if (!defined(ENABLE_MULTIPLE_NODES)) && (!defined(ENABLE_PRIVATEGAUSS))
 /* for dolphin and whale plugin */