修复enable_multi_charset下walsender初始化失败的问题

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

@@ -2826,6 +2826,7 @@ void PostgresInitializer::InitSettings()
 
     /* initialize client encoding */
     InitializeClientEncoding();
+    InitializeCharsetEncoding();
 }
 
 void PostgresInitializer::InitExtensionVariable()

src/common/backend/utils/mb/mbutils.cpp

@@ -241,6 +241,14 @@ void InitializeClientEncoding(void)
                     pg_enc2name_tbl[u_sess->mb_cxt.pending_client_encoding].name,
                     GetDatabaseEncodingName())));
     }
+}
+
+void InitializeCharsetEncoding(void)
+{
+    if (!u_sess->mb_cxt.backend_startup_complete) {
+        return;
+    }
+
     u_sess->mb_cxt.character_set_connection = &pg_enc2name_tbl[GetDatabaseEncoding()];
     if (ENABLE_MULTI_CHARSET) {
         u_sess->mb_cxt.collation_connection = get_default_collation_by_charset(GetDatabaseEncoding(), false);

src/include/mb/pg_wchar.h

@@ -463,6 +463,7 @@ extern mbcharacter_incrementer pg_database_encoding_character_incrementer(void);
 extern int PrepareClientEncoding(int encoding);
 extern int SetClientEncoding(int encoding);
 extern void InitializeClientEncoding(void);
+extern void InitializeCharsetEncoding(void);
 extern int pg_get_client_encoding(void);
 extern const char* pg_get_client_encoding_name(void);
 

src/test/regress/input/charset_connection_test.source

@@ -177,4 +177,16 @@ select * from t1;
 create database latin1_db dbcompatibility 'b' encoding 'latin1' lc_ctype = 'C' lc_collate = 'C';
 \c latin1_db
 select '高斯aa' = '高斯AA';
+
+\! @abs_bindir@/gs_guc reload -Z datanode -D @abs_srcdir@/tmp_check/datanode1 -c "b_format_behavior_compat_options='enable_multi_charset'" >/dev/null 2>&1
+select pg_sleep(1);
+
+\! mkdir @abs_srcdir@/tmp_check/charset_connection_test_backup/
+\! @abs_bindir@/gs_basebackup -hlocalhost -p@portstring@ -D @abs_srcdir@/tmp_check/charset_connection_test_backup/ 2>&1 |grep successfully
+
+\! rm -rf @abs_srcdir@/tmp_check/charset_connection_test_backup/
+
+\! @abs_bindir@/gs_guc reload -Z datanode -D @abs_srcdir@/tmp_check/datanode1 -c "b_format_behavior_compat_options=''" >/dev/null 2>&1
+select pg_sleep(1);
+
 \c regression

src/test/regress/output/charset_connection_test.source

@@ -587,4 +587,22 @@ select '高斯aa' = '高斯AA';
  f
 (1 row)
 
+\! @abs_bindir@/gs_guc reload -Z datanode -D @abs_srcdir@/tmp_check/datanode1 -c "b_format_behavior_compat_options='enable_multi_charset'" >/dev/null 2>&1
+select pg_sleep(1);
+ pg_sleep 
+----------
+ 
+(1 row)
+
+\! mkdir @abs_srcdir@/tmp_check/charset_connection_test_backup/
+\! @abs_bindir@/gs_basebackup -hlocalhost -p@portstring@ -D @abs_srcdir@/tmp_check/charset_connection_test_backup/ 2>&1 |grep successfully
+--?.*gs_basebackup: base backup successfully
+\! rm -rf @abs_srcdir@/tmp_check/charset_connection_test_backup/
+\! @abs_bindir@/gs_guc reload -Z datanode -D @abs_srcdir@/tmp_check/datanode1 -c "b_format_behavior_compat_options=''" >/dev/null 2>&1
+select pg_sleep(1);
+ pg_sleep 
+----------
+ 
+(1 row)
+
 \c regression