MDEV-27595 Backport SQL service, introduced by MDEV-19275.

Embedded-server related fixes.

libmysqld/emb_qcache.cc

@@ -490,7 +490,7 @@ int emb_load_querycache_result(THD *thd, Querycache_stream *src)
   *prev_row= NULL;
   data->embedded_info->prev_ptr= prev_row;
 return_ok:
-  net_send_eof(thd, thd->server_status,
+  thd->protocol->net_send_eof(thd, thd->server_status,
                thd->get_stmt_da()->current_statement_warn_count());
   DBUG_RETURN(0);
 err:

libmysqld/lib_sql.cc

@@ -1125,7 +1125,7 @@ bool Protocol::send_result_set_metadata(List<Item> *list, uint flags)
 
   for (uint pos= 0 ; (item= it++); pos++)
   {
-    if (prot.store_field_metadata(thd, item, pos))
+    if (prot.store_item_metadata(thd, item, pos))
       goto err;
   }
 
@@ -1240,8 +1240,7 @@ bool Protocol_binary::write()
     @retval FALSE Success
 */
 
-bool
-net_send_ok(THD *thd,
+bool Protocol::net_send_ok(THD *thd,
             uint server_status, uint statement_warn_count,
             ulonglong affected_rows, ulonglong id, const char *message,
             bool, bool)
@@ -1276,7 +1275,7 @@ net_send_ok(THD *thd,
 */
 
 bool
-net_send_eof(THD *thd, uint server_status, uint statement_warn_count)
+Protocol::net_send_eof(THD *thd, uint server_status, uint statement_warn_count)
 {
   bool error= write_eof_packet(thd, server_status, statement_warn_count);
   thd->cur_data= 0;
@@ -1284,8 +1283,8 @@ net_send_eof(THD *thd, uint server_status, uint statement_warn_count)
 }
 
 
-bool net_send_error_packet(THD *thd, uint sql_errno, const char *err,
-                           const char *sqlstate)
+bool Protocol::net_send_error_packet(THD *thd, uint sql_errno, const char *err,
+                                     const char *sqlstate)
 {
   uint error;
   char converted_err[MYSQL_ERRMSG_SIZE];

sql/protocol.cc

@@ -906,7 +906,7 @@ bool Protocol::send_result_set_metadata(List<Item> *list, uint flags)
   for (uint pos= 0; (item=it++); pos++)
   {
     prot.prepare_for_resend();
-    if (prot.store_field_metadata(thd, item, pos))
+    if (prot.store_item_metadata(thd, item, pos))
       goto err;
     if (prot.write())
       DBUG_RETURN(1);
@@ -986,7 +986,7 @@ bool Protocol::write()
 #endif /* EMBEDDED_LIBRARY */
 
 
-bool Protocol_text::store_field_metadata(THD *thd, Item *item, uint pos)
+bool Protocol_text::store_item_metadata(THD *thd, Item *item, uint pos)
 {
   Send_field field(thd, item);
   return store_field_metadata(thd, field, item->charset_for_protocol(), pos);

sql/protocol.h

@@ -201,7 +201,7 @@ class Protocol_text :public Protocol
   bool store_field_metadata(const THD *thd, const Send_field &field,
                             CHARSET_INFO *charset_for_protocol,
                             uint pos);
-  bool store_field_metadata(THD *thd, Item *item, uint pos);
+  bool store_item_metadata(THD *thd, Item *item, uint pos);
   bool store_field_metadata_for_list_fields(const THD *thd, Field *field,
                                             const TABLE_LIST *table_list,
                                             uint pos);