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Commit 06291c3f authored by Sergei Golubchik's avatar Sergei Golubchik
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small cleanup 

comments, rename a function to reflect its usage better
parent 4e0c6139
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Showing with 33 additions and 73 deletions
sql/sql_statistics.cc
View file @ 06291c3f
......@@ -102,29 +102,6 @@ inline void init_table_list_for_stat_tables(TABLE_LIST *tables, bool for_write)
}
}
/**
@details
The function builds a TABLE_LIST containing only one element 'tbl' for
the statistical table called 'stat_tab_name'.
The lock type of the element is set to TL_READ if for_write = FALSE,
otherwise it is set to TL_WRITE.
*/
static inline
void init_table_list_for_single_stat_table(TABLE_LIST *tbl,
const LEX_CSTRING *stat_tab_name,
bool for_write)
{
memset((char *) tbl, 0, sizeof(TABLE_LIST));
tbl->db= MYSQL_SCHEMA_NAME;
tbl->table_name= *stat_tab_name;
tbl->alias= *stat_tab_name;
tbl->lock_type= for_write ? TL_WRITE : TL_READ;
}
static Table_check_intact_log_error stat_table_intact;
static const
......@@ -286,15 +263,16 @@ inline int open_stat_tables(THD *thd, TABLE_LIST *tables,
/**
@brief
Open a statistical table and lock it
@details
This is used by DDLs. When a column or index is dropped or renamed,
stat tables need to be adjusted accordingly.
*/
static
inline int open_single_stat_table(THD *thd, TABLE_LIST *table,
static inline int open_stat_table_for_ddl(THD *thd, TABLE_LIST *table,
const LEX_CSTRING *stat_tab_name,
Open_tables_backup *backup,
bool for_write)
Open_tables_backup *backup)
{
init_table_list_for_single_stat_table(table, stat_tab_name, for_write);
init_mdl_requests(table);
table->init_one_table(&MYSQL_SCHEMA_NAME, stat_tab_name, NULL, TL_WRITE);
return open_system_tables_for_read(thd, table, backup);
}
......@@ -3478,21 +3456,16 @@ int delete_statistics_for_table(THD *thd, const LEX_CSTRING *db,
@brief
Delete statistics on a column of the specified table
@param
thd The thread handle
@param
tab The table the column belongs to
@param
col The field of the column whose statistics is to be deleted
@param thd The thread handle
@param tab The table the column belongs to
@param col The field of the column whose statistics is to be deleted
@details
The function delete statistics on the column 'col' belonging to the table
'tab' from the statistical table column_stats.
@retval
0 If all deletions are successful or we couldn't open statistics table
@retval
1 Otherwise
@retval 0 If all deletions are successful or we couldn't open statistics table
@retval 1 Otherwise
@note
The function is called when dropping a table column or when changing
......@@ -3509,8 +3482,8 @@ int delete_statistics_for_column(THD *thd, TABLE *tab, Field *col)
int rc= 0;
DBUG_ENTER("delete_statistics_for_column");
if (open_single_stat_table(thd, &tables, &stat_table_name[1],
&open_tables_backup, TRUE))
if (open_stat_table_for_ddl(thd, &tables, &stat_table_name[1],
&open_tables_backup))
DBUG_RETURN(0);
save_binlog_format= thd->set_current_stmt_binlog_format_stmt();
......@@ -3537,24 +3510,18 @@ int delete_statistics_for_column(THD *thd, TABLE *tab, Field *col)
@brief
Delete statistics on an index of the specified table
@param
thd The thread handle
@param
tab The table the index belongs to
@param
key_info The descriptor of the index whose statistics is to be deleted
@param
ext_prefixes_only Delete statistics only on the index prefixes extended by
the components of the primary key
@param thd The thread handle
@param tab The table the index belongs to
@param key_info The descriptor of the index whose statistics is to be deleted
@param ext_prefixes_only Delete statistics only on the index prefixes
extended by the components of the primary key
@details
The function delete statistics on the index specified by 'key_info'
defined on the table 'tab' from the statistical table index_stats.
@retval
0 If all deletions are successful or we couldn't open statistics table
@retval
1 Otherwise
@retval 0 If all deletions are successful or we couldn't open statistics table
@retval 1 Otherwise
@note
The function is called when dropping an index, or dropping/changing the
......@@ -3572,8 +3539,8 @@ int delete_statistics_for_index(THD *thd, TABLE *tab, KEY *key_info,
int rc= 0;
DBUG_ENTER("delete_statistics_for_index");
if (open_single_stat_table(thd, &tables, &stat_table_name[2],
&open_tables_backup, TRUE))
if (open_stat_table_for_ddl(thd, &tables, &stat_table_name[2],
&open_tables_backup))
DBUG_RETURN(0);
save_binlog_format= thd->set_current_stmt_binlog_format_stmt();
......@@ -3716,26 +3683,19 @@ int rename_table_in_stat_tables(THD *thd, const LEX_CSTRING *db,
/**
@brief
Rename a column in the statistical table column_stats
@param
thd The thread handle
@param
tab The table the column belongs to
@param
col The column to be renamed
@param
new_name The new column name
@param thd The thread handle
@param tab The table the column belongs to
@param col The column to be renamed
@param new_name The new column name
@details
The function replaces the name of the column 'col' belonging to the table
'tab' for 'new_name' in the statistical table column_stats.
@retval
0 If all updates of the table name are successful
@retval
1 Otherwise
@retval 0 If all updates of the table name are successful
@retval 1 Otherwise
@note
The function is called when executing any statement that renames a column,
......@@ -3756,8 +3716,8 @@ int rename_column_in_stat_tables(THD *thd, TABLE *tab, Field *col,
if (tab->s->tmp_table != NO_TMP_TABLE)
DBUG_RETURN(0);
if (open_single_stat_table(thd, &tables, &stat_table_name[1],
&open_tables_backup, TRUE))
if (open_stat_table_for_ddl(thd, &tables, &stat_table_name[1],
&open_tables_backup))
DBUG_RETURN(rc);
save_binlog_format= thd->set_current_stmt_binlog_format_stmt();
......
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