!3539 修复发布端主备切换后，订阅端无法自动连接到新主的问题

Merge pull request !3539 from pengjiong/fix_date

src/gausskernel/process/threadpool/knl_thread.cpp

@@ -1084,6 +1084,7 @@ static void KnlTPublicationInit(knl_t_publication_context* publicationCxt)
     publicationCxt->publications_valid = false;
     publicationCxt->RelationSyncCache = NULL;
     publicationCxt->updateConninfoNeeded = false;
+    publicationCxt->firstTimeSendConninfo = false;
 }
 
 static void KnlTUndolauncherInit(knl_t_undolauncher_context* undolauncherCxt)

src/gausskernel/storage/replication/pgoutput/pgoutput.cpp

@@ -178,6 +178,7 @@ static void pgoutput_startup(LogicalDecodingContext *ctx, OutputPluginOptions *o
         if (data->protocol_version >= LOGICALREP_CONNINFO_PROTO_VERSION_NUM) {
             t_thrd.publication_cxt.updateConninfoNeeded = true;
         }
+        t_thrd.publication_cxt.firstTimeSendConninfo = true;
         CacheRegisterThreadSyscacheCallback(PUBLICATIONOID, publication_invalidation_cb, (Datum)0);
 
         /* Initialize relation schema cache. */
@@ -235,7 +236,8 @@ static void pgoutput_commit_txn(LogicalDecodingContext *ctx, ReorderBufferTXN *t
      * Send the newest connecttion information to the subscriber,
      * when the connection information about the standby changes.
      */
-    if (t_thrd.publication_cxt.updateConninfoNeeded && ReplconninfoChanged()) {
+    if ((t_thrd.publication_cxt.updateConninfoNeeded && ReplconninfoChanged()) ||
+        t_thrd.publication_cxt.firstTimeSendConninfo) {
         StringInfoData standbysInfo;
         initStringInfo(&standbysInfo);
 
@@ -245,6 +247,7 @@ static void pgoutput_commit_txn(LogicalDecodingContext *ctx, ReorderBufferTXN *t
         OutputPluginWrite(ctx, true);
 
         FreeStringInfo(&standbysInfo);
+        t_thrd.publication_cxt.firstTimeSendConninfo = false;
     }
 }
 

src/include/knl/knl_thread.h

@@ -3339,6 +3339,7 @@ typedef struct knl_t_publication_context {
     /* Map used to remember which relation schemas we sent. */
     HTAB* RelationSyncCache;
     bool updateConninfoNeeded;
+    bool firstTimeSendConninfo;
 } knl_t_publication_context;
 
 typedef struct knl_t_dms_context {