cleanup of SHOW STATUS code, as a preparation for WL#2935

(MySQL plugin interface: status variables)

adding SHOW_FUNC, removing SHOW_some_specific_value,
only generic SHOW_LONG/SHOW_CHAR/etc are recognized.
changing to use SHOW_FUNC instead of ha_update_statistics


sql/ha_innodb.h:
  cleanup of SHOW STATUS code, as a preparation for WL#2935
  removing ha_update_statistics().
sql/handler.cc:
  cleanup of SHOW STATUS code, as a preparation for WL#2935
  removing ha_update_statistics().
sql/handler.h:
  cleanup of SHOW STATUS code, as a preparation for WL#2935
  removing ha_update_statistics().
sql/mysqld.cc:
  cleanup of SHOW STATUS code, as a preparation for WL#2935
  adding SHOW_FUNC, removing SHOW_some_specific_variable,
  only generic SHOW_LONG/SHOW_CHAR/etc are recognized.
  changing to use SHOW_FUNC instead of ha_update_statistics
sql/set_var.cc:
  cleanup of SHOW STATUS code, as a preparation for WL#2935
  adding SHOW_FUNC, removing SHOW_some_specific_variable,
  only generic SHOW_LONG/SHOW_CHAR/etc are recognized.
sql/sql_show.cc:
  cleanup of SHOW STATUS code, as a preparation for WL#2935
  adding SHOW_FUNC, removing SHOW_some_specific_variable,
  only generic SHOW_LONG/SHOW_CHAR/etc are recognized.
  changing to use SHOW_FUNC instead of ha_update_statistics
sql/structs.h:
  cleanup of SHOW STATUS code, as a preparation for WL#2935
  adding SHOW_FUNC, removing SHOW_some_specific_variable,
  only generic SHOW_LONG/SHOW_CHAR/etc are recognized.

sql/ha_innodb.h

@@ -277,7 +277,6 @@ void innobase_store_binlog_offset_and_flush_log(char *binlog_name,longlong offse
 
 void innobase_drop_database(char *path);
 bool innobase_show_status(THD* thd, stat_print_fn*, enum ha_stat_type);
-int innodb_export_status(void);
 
 int innobase_release_temporary_latches(THD *thd);
 

sql/handler.cc

@@ -1180,15 +1180,6 @@ int ha_release_temporary_latches(THD *thd)
 #endif
 }
 
-
-int ha_update_statistics()
-{
-#ifdef WITH_INNOBASE_STORAGE_ENGINE
-  innodb_export_status();
-#endif
-  return 0;
-}
-
 int ha_rollback_to_savepoint(THD *thd, SAVEPOINT *sv)
 {
   int error=0;

sql/handler.h

@@ -1549,7 +1549,6 @@ int ha_initialize_handlerton(handlerton *hton);
 
 TYPELIB *ha_known_exts(void);
 int ha_panic(enum ha_panic_function flag);
-int ha_update_statistics();
 void ha_close_connection(THD* thd);
 bool ha_flush_logs(handlerton *db_type);
 void ha_drop_database(char* path);

sql/set_var.cc

@@ -623,6 +623,45 @@ sys_var_have_variable sys_have_row_based_replication("have_row_based_replication
 /* Global read-only variable describing server license */
 sys_var_const_str		sys_license("license", STRINGIFY_ARG(LICENSE));
 
+#ifdef HAVE_REPLICATION
+static int show_slave_skip_errors(THD *thd, show_var_st *var, char *buff)
+{
+  var->type=SHOW_CHAR;
+  var->value= buff;
+  if (!use_slave_mask || bitmap_is_clear_all(&slave_error_mask))
+  {
+    var->value= "OFF";
+  }
+  else if (bitmap_is_set_all(&slave_error_mask))
+  {
+    var->value= "ALL";
+  }
+  else
+  {
+    /* 10 is enough assuming errors are max 4 digits */
+    int i;
+    var->value= buff;
+    for (i= 1;
+         i < MAX_SLAVE_ERROR &&
+         (buff - var->value) < SHOW_VAR_FUNC_BUFF_SIZE;
+         i++)
+    {
+      if (bitmap_is_set(&slave_error_mask, i))
+      {
+        buff= int10_to_str(i, buff, 10);
+        *buff++= ',';
+      }
+    }
+    if (var->value != buff)
+      buff--;				// Remove last ','
+    if (i < MAX_SLAVE_ERROR)
+      buff= strmov(buff, "...");  // Couldn't show all errors
+    *buff=0;
+  }
+  return 0;
+}
+#endif /* HAVE_REPLICATION */
+
 
 /*
   Variables shown by SHOW variables in alphabetical order
@@ -863,7 +902,7 @@ struct show_var_st init_vars[]= {
     (char*) &sys_slave_compressed_protocol,           SHOW_SYS},
   {"slave_load_tmpdir",       (char*) &slave_load_tmpdir,           SHOW_CHAR_PTR},
   {sys_slave_net_timeout.name,(char*) &sys_slave_net_timeout,	    SHOW_SYS},
-  {"slave_skip_errors",       (char*) &slave_error_mask,            SHOW_SLAVE_SKIP_ERRORS},
+  {"slave_skip_errors",       (char*) &show_slave_skip_errors,      SHOW_FUNC},
   {sys_slave_trans_retries.name,(char*) &sys_slave_trans_retries,   SHOW_SYS},
 #endif
   {sys_slow_launch_time.name, (char*) &sys_slow_launch_time,        SHOW_SYS},

sql/structs.h

@@ -175,27 +175,10 @@ enum SHOW_TYPE
   SHOW_UNDEF,
   SHOW_LONG, SHOW_LONGLONG, SHOW_INT, SHOW_CHAR, SHOW_CHAR_PTR,
   SHOW_DOUBLE_STATUS, SHOW_BOOL, SHOW_MY_BOOL,
-  SHOW_OPEN_TABLES, SHOW_TABLE_DEFINITIONS, SHOW_STARTTIME, SHOW_QUESTION,
   SHOW_LONG_CONST, SHOW_INT_CONST, SHOW_HAVE, SHOW_SYS, SHOW_HA_ROWS,
-  SHOW_VARS,
-#ifdef HAVE_OPENSSL
-  SHOW_SSL_CTX_SESS_ACCEPT, 	SHOW_SSL_CTX_SESS_ACCEPT_GOOD,
-  SHOW_SSL_GET_VERSION, 	SHOW_SSL_CTX_GET_SESSION_CACHE_MODE,
-  SHOW_SSL_CTX_SESS_CB_HITS, 	SHOW_SSL_CTX_SESS_ACCEPT_RENEGOTIATE,
-  SHOW_SSL_CTX_SESS_NUMBER, 	SHOW_SSL_SESSION_REUSED,
-  SHOW_SSL_CTX_SESS_GET_CACHE_SIZE, SHOW_SSL_GET_CIPHER,
-  SHOW_SSL_GET_DEFAULT_TIMEOUT,	SHOW_SSL_GET_VERIFY_MODE,
-  SHOW_SSL_CTX_GET_VERIFY_MODE, SHOW_SSL_GET_VERIFY_DEPTH,
-  SHOW_SSL_CTX_GET_VERIFY_DEPTH, SHOW_SSL_CTX_SESS_CONNECT,
-  SHOW_SSL_CTX_SESS_CONNECT_RENEGOTIATE, SHOW_SSL_CTX_SESS_CONNECT_GOOD,
-  SHOW_SSL_CTX_SESS_HITS, SHOW_SSL_CTX_SESS_MISSES,
-  SHOW_SSL_CTX_SESS_TIMEOUTS, SHOW_SSL_CTX_SESS_CACHE_FULL,
-  SHOW_SSL_GET_CIPHER_LIST,
-#endif /* HAVE_OPENSSL */
-  SHOW_NET_COMPRESSION,
-  SHOW_RPL_STATUS, SHOW_SLAVE_RUNNING, SHOW_SLAVE_RETRIED_TRANS,
+  SHOW_ARRAY, SHOW_FUNC,
   SHOW_KEY_CACHE_LONG, SHOW_KEY_CACHE_CONST_LONG, SHOW_KEY_CACHE_LONGLONG,
-  SHOW_LONG_STATUS, SHOW_LONG_CONST_STATUS, SHOW_SLAVE_SKIP_ERRORS
+  SHOW_LONG_STATUS, SHOW_LONG_CONST_STATUS
 };
 
 enum SHOW_COMP_OPTION { SHOW_OPTION_YES, SHOW_OPTION_NO, SHOW_OPTION_DISABLED};
@@ -204,19 +187,19 @@ extern const char *show_comp_option_name[];
 
 typedef int *(*update_var)(THD *, struct show_var_st *);
 
-
 typedef struct show_var_st {
   const char *name;
   char *value;
   SHOW_TYPE type;
 } SHOW_VAR;
 
+#define SHOW_VAR_FUNC_BUFF_SIZE 1024
+typedef int (*show_var_func)(THD *, struct show_var_st *, char *);
 
 typedef struct	st_lex_user {
   LEX_STRING user, host, password;
 } LEX_USER;
 
-
 /*
   This structure specifies the maximum amount of resources which
   can be consumed by each account. Zero value of a member means