MDEV-5273 Prepared statement doesn't return metadata after prepare.

SHOW BINARY LOGS fixed.

sql/sql_prepare.cc

@@ -104,6 +104,7 @@ When one supplies long data for a placeholder:
                          // mysql_handle_derived
 #include "sql_cursor.h"
 #include "sql_show.h"
+#include "sql_repl.h"
 #include "slave.h"
 #include "sp_head.h"
 #include "sp.h"
@@ -1939,6 +1940,29 @@ static bool mysql_test_show_master_status(Prepared_statement *stmt)
 }
 
 
+/**
+  Validate and prepare for execution SHOW BINLOGS statement.
+
+  @param stmt               prepared statement
+
+  @retval
+    FALSE             success
+  @retval
+    TRUE              error, error message is set in THD
+*/
+
+static bool mysql_test_show_binlogs(Prepared_statement *stmt)
+{
+  DBUG_ENTER("mysql_test_show_binlogs");
+  THD *thd= stmt->thd;
+  List<Item> fields;
+
+  show_binlogs_get_fields(thd, &fields);
+    
+  DBUG_RETURN(send_stmt_metadata(thd, stmt, &fields));
+}
+
+
 /**
   @brief Validate and prepare for execution CREATE VIEW statement
 
@@ -2307,6 +2331,13 @@ static bool check_prepared_statement(Prepared_statement *stmt)
       DBUG_RETURN(FALSE);
     }
     break;
+  case SQLCOM_SHOW_BINLOGS:
+    if (!(res= mysql_test_show_binlogs(stmt)))
+    {
+      /* Statement and field info has already been sent */
+      DBUG_RETURN(FALSE);
+    }
+    break;
   case SQLCOM_CREATE_VIEW:
     if (lex->create_view_mode == VIEW_ALTER)
     {

sql/sql_repl.cc

@@ -4146,6 +4146,19 @@ bool show_binlog_info(THD* thd)
 }
 
 
+void show_binlogs_get_fields(THD *thd, List<Item> *field_list)
+{
+  MEM_ROOT *mem_root= thd->mem_root;
+  field_list->push_back(new (mem_root)
+                        Item_empty_string(thd, "Log_name", 255),
+                        mem_root);
+  field_list->push_back(new (mem_root)
+                        Item_return_int(thd, "File_size", 20,
+                                        MYSQL_TYPE_LONGLONG),
+                        mem_root);
+}
+
+
 /**
   Execute a SHOW BINARY LOGS statement.
 
@@ -4165,7 +4178,6 @@ bool show_binlogs(THD* thd)
   uint length;
   int cur_dir_len;
   Protocol *protocol= thd->protocol;
-  MEM_ROOT *mem_root= thd->mem_root;
   DBUG_ENTER("show_binlogs");
 
   if (!mysql_bin_log.is_open())
@@ -4174,13 +4186,8 @@ bool show_binlogs(THD* thd)
     DBUG_RETURN(TRUE);
   }
 
-  field_list.push_back(new (mem_root)
+  show_binlogs_get_fields(thd, &field_list);
-                       Item_empty_string(thd, "Log_name", 255),
+
-                       mem_root);
-  field_list.push_back(new (mem_root)
-                       Item_return_int(thd, "File_size", 20,
-                                       MYSQL_TYPE_LONGLONG),
-                       mem_root);
   if (protocol->send_result_set_metadata(&field_list,
                             Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
     DBUG_RETURN(TRUE);

sql/sql_repl.h

@@ -52,6 +52,7 @@ bool purge_master_logs(THD* thd, const char* to_log);
 bool purge_master_logs_before_date(THD* thd, time_t purge_time);
 bool log_in_use(const char* log_name);
 void adjust_linfo_offsets(my_off_t purge_offset);
+void show_binlogs_get_fields(THD *thd, List<Item> *field_list);
 bool show_binlogs(THD* thd);
 extern int init_master_info(Master_info* mi);
 void kill_zombie_dump_threads(uint32 slave_server_id);