!1669 add wm_concat function to use internal datatype

Merge pull request !1669 from 吕辉/wm_concat

src/common/backend/catalog/pg_aggregate.cpp

@@ -47,7 +47,8 @@ static void InternalAggIsSupported(const char *aggName)
         "json_agg",
         "json_object_agg",
         "st_summarystatsagg",
-        "st_union"
+        "st_union",
+        "wm_concat"
     };
 
     uint len = lengthof(supportList);

src/gausskernel/process/tcop/postgres.cpp

@@ -827,9 +827,6 @@ void InitBSqlPluginHookIfNeeded()
 {
     const char* b_sql_plugin = "b_sql_plugin";
     CFunInfo tmpCF;
-    if (!CheckIfExtensionExists(b_sql_plugin)) {
-        return;
-    }
 
     tmpCF = load_external_function(b_sql_plugin, INIT_PLUGIN_OBJECT, false, false);
     if (tmpCF.user_fn != NULL) {
@@ -7572,7 +7569,7 @@ int PostgresMain(int argc, char* argv[], const char* dbname, const char* usernam
         init_set_params_htab();
 
 #ifndef ENABLE_MULTIPLE_NODES
-    if (u_sess->proc_cxt.MyDatabaseId != InvalidOid && DB_IS_CMPT(B_FORMAT)) {
+    if (u_sess->proc_cxt.MyDatabaseId != InvalidOid && DB_IS_CMPT(B_FORMAT) && u_sess->attr.attr_sql.b_sql_plugin) {
         InitBSqlPluginHookIfNeeded();
     }
 #endif

src/gausskernel/process/threadpool/threadpool_worker.cpp

@@ -848,7 +848,7 @@ static bool InitSession(knl_session_context* session)
     t_thrd.proc_cxt.PostInit->InitSession();
 
 #ifndef ENABLE_MULTIPLE_NODES
-    if (u_sess->proc_cxt.MyDatabaseId != InvalidOid && DB_IS_CMPT(B_FORMAT)) {
+    if (u_sess->proc_cxt.MyDatabaseId != InvalidOid && DB_IS_CMPT(B_FORMAT) && u_sess->attr.attr_sql.b_sql_plugin) {
         InitBSqlPluginHookIfNeeded();
     }
 #endif