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handlerton::discover_table_names() can not discover only

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"unknown" tables. Duplicates are possible - deal with them.
This commit is contained in:
Sergei Golubchik 2013-04-09 15:49:00 +02:00
parent a489ae89b9
commit 5d364e53cb
8 changed files with 191 additions and 125 deletions
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5
sql/discover.cc
View File

@ -232,11 +232,10 @@ int extension_based_table_discovery(MY_DIR *dirp, const char *ext_meta,
will ignore them. Anyone still having these files, should disable
discovering engines, and rename these invalid table files.
*/
int ext_table_discovery_simple(MY_DIR *dirp, const char *ext_meta,
int ext_table_discovery_simple(MY_DIR *dirp,
handlerton::discovered_list *result)
{
CHARSET_INFO *cs= character_set_filesystem;
size_t ext_meta_len= strlen(ext_meta);
FILEINFO *cur, *end;
cur= dirp->dir_entry;
@ -248,7 +247,7 @@ int ext_table_discovery_simple(MY_DIR *dirp, const char *ext_meta,
if (ext && !is_prefix(cur->name, tmp_file_prefix))
{
if (my_strnncoll(cs, (uchar*)ext, strlen(ext),
(uchar*)ext_meta, ext_meta_len) == 0)
(uchar*)reg_ext, reg_ext_length) == 0)
{
*ext = 0;
if (result->add_file(cur->name))

2
sql/discover.h
View File

@ -25,7 +25,7 @@ int extension_based_table_discovery(MY_DIR *dirp, const char *ext,
handlerton::discovered_list *tl);
#ifdef MYSQL_SERVER
int ext_table_discovery_simple(MY_DIR *dirp, const char *ext_meta,
int ext_table_discovery_simple(MY_DIR *dirp,
handlerton::discovered_list *result);
#endif

184
sql/handler.cc
View File

@ -383,12 +383,36 @@ static int ha_finish_errors(void)
return 0;
}
volatile int32 need_full_discover_for_existence= 0;
static volatile int32 need_full_discover_for_existence= 0;
static volatile int32 engines_with_discover_table_names= 0;
static int full_discover_for_existence(handlerton *, const char *, const char *)
{ return 1; }
static int ext_based_existence(handlerton *, const char *, const char *)
{ return 1; }
static int hton_ext_based_table_discovery(handlerton *hton, LEX_STRING *db,
MY_DIR *dir, handlerton::discovered_list *result)
{
/*
tablefile_extensions[0] is the metadata file, see
the comment above tablefile_extensions declaration
*/
return extension_based_table_discovery(dir, hton->tablefile_extensions[0],
result);
}
static void update_discovery_counters(handlerton *hton, int val)
{
if (hton->discover_table_existence == full_discover_for_existence)
my_atomic_add32(&need_full_discover_for_existence, val);
if (hton->discover_table_names)
my_atomic_add32(&engines_with_discover_table_names, val);
}
int ha_finalize_handlerton(st_plugin_int *plugin)
{
handlerton *hton= (handlerton *)plugin->data;
@ -438,11 +462,7 @@ int ha_finalize_handlerton(st_plugin_int *plugin)
hton2plugin[hton->slot]= NULL;
}
if (hton->discover_table_existence == full_discover_for_existence)
my_atomic_add32(&need_full_discover_for_existence, -1);
if (hton->discover_table_names)
my_atomic_add32(&engines_with_discover_table_names, -1);
update_discovery_counters(hton, -1);
my_free(hton);
@ -451,13 +471,6 @@ int ha_finalize_handlerton(st_plugin_int *plugin)
}
static int hton_ext_based_table_discovery(handlerton *hton, LEX_STRING *db,
MY_DIR *dir, handlerton::discovered_list *result)
{
return extension_based_table_discovery(dir, hton->tablefile_extensions[0],
result);
}
int ha_initialize_handlerton(st_plugin_int *plugin)
{
handlerton *hton;
@ -474,6 +487,9 @@ int ha_initialize_handlerton(st_plugin_int *plugin)
goto err_no_hton_memory;
}
hton->tablefile_extensions= no_exts;
hton->discover_table_names= hton_ext_based_table_discovery;
hton->slot= HA_SLOT_UNDEF;
/* Historical Requirement */
plugin->data= hton; // shortcut for the future
@ -484,15 +500,11 @@ int ha_initialize_handlerton(st_plugin_int *plugin)
goto err;
}
// default list file extensions: empty
if (!hton->tablefile_extensions)
hton->tablefile_extensions= no_exts;
// if the enfine can discover a single table and it is file-based
// then it can use a default file-based table names discovery
if (!hton->discover_table_names &&
hton->discover_table && hton->tablefile_extensions[0])
hton->discover_table_names= hton_ext_based_table_discovery;
// hton_ext_based_table_discovery() works only when discovery
// is supported and the engine if file-based.
if (hton->discover_table_names == hton_ext_based_table_discovery &&
(!hton->discover_table || !hton->tablefile_extensions[0]))
hton->discover_table_names= NULL;
// default discover_table_existence implementation
if (!hton->discover_table_existence && hton->discover_table)
@ -500,10 +512,7 @@ int ha_initialize_handlerton(st_plugin_int *plugin)
if (hton->tablefile_extensions[0])
hton->discover_table_existence= ext_based_existence;
else
{
hton->discover_table_existence= full_discover_for_existence;
my_atomic_add32(&need_full_discover_for_existence, 1);
}
}
/*
@ -595,8 +604,7 @@ int ha_initialize_handlerton(st_plugin_int *plugin)
break;
};
if (hton->discover_table_names)
my_atomic_add32(&engines_with_discover_table_names, 1);
update_discovery_counters(hton, 1);
DBUG_RETURN(0);
@ -4474,13 +4482,88 @@ bool ha_table_exists(THD *thd, const char *db, const char *table_name,
/**
Discover all table names in a given database
*/
volatile int32 engines_with_discover_table_names= 0;
extern "C" {
static int cmp_file_names(const void *a, const void *b)
{
CHARSET_INFO *cs= character_set_filesystem;
char *aa= ((FILEINFO *)a)->name;
char *bb= ((FILEINFO *)b)->name;
return my_strnncoll(cs, (uchar*)aa, strlen(aa), (uchar*)bb, strlen(bb));
}
static int cmp_table_names(LEX_STRING * const *a, LEX_STRING * const *b)
{
return my_strnncoll(&my_charset_bin, (uchar*)((*a)->str), (*a)->length,
(uchar*)((*b)->str), (*b)->length);
}
}
Discovered_table_list::Discovered_table_list(THD *thd_arg,
Dynamic_array<LEX_STRING*> *tables_arg,
const LEX_STRING *wild_arg)
{
thd= thd_arg;
tables= tables_arg;
if (wild_arg->str && wild_arg->str[0])
{
wild= wild_arg->str;
wend= wild + wild_arg->length;
}
else
wild= 0;
}
bool Discovered_table_list::add_table(const char *tname, size_t tlen)
{
if (wild && my_wildcmp(files_charset_info, tname, tname + tlen, wild, wend,
wild_prefix, wild_one, wild_many))
return 0;
LEX_STRING *name= thd->make_lex_string(tname, tlen);
if (!name || tables->append(name))
return 1;
return 0;
}
bool Discovered_table_list::add_file(const char *fname)
{
char tname[SAFE_NAME_LEN + 1];
size_t tlen= filename_to_tablename(fname, tname, sizeof(tname));
return add_table(tname, tlen);
}
void Discovered_table_list::sort()
{
tables->sort(cmp_table_names);
}
void Discovered_table_list::remove_duplicates()
{
LEX_STRING **src= tables->front();
LEX_STRING **dst= src;
while (++dst < tables->back())
{
LEX_STRING *s= *src, *d= *dst;
DBUG_ASSERT(strncmp(s->str, d->str, min(s->length, d->length)) <= 0);
if ((s->length != d->length || strncmp(s->str, d->str, d->length)))
{
src++;
if (src != dst)
*src= *dst;
}
}
tables->set_elements(src - tables->front() + 1);
}
struct st_discover_names_args
{
LEX_STRING *db;
MY_DIR *dirp;
handlerton::discovered_list *result;
Discovered_table_list *result;
uint possible_duplicates;
};
static my_bool discover_names(THD *thd, plugin_ref plugin,
@ -4488,28 +4571,51 @@ static my_bool discover_names(THD *thd, plugin_ref plugin,
{
st_discover_names_args *args= (st_discover_names_args *)arg;
handlerton *ht= plugin_data(plugin, handlerton *);
if (ht->state == SHOW_OPTION_YES && ht->discover_table_names &&
ht->discover_table_names(ht, args->db, args->dirp, args->result))
return 1;
if (ht->state == SHOW_OPTION_YES && ht->discover_table_names)
{
uint old_elements= args->result->tables->elements();
if (ht->discover_table_names(ht, args->db, args->dirp, args->result))
return 1;
/*
hton_ext_based_table_discovery never discovers a table that has
a corresponding .frm file; but custom engine discover methods might
*/
if (ht->discover_table_names != hton_ext_based_table_discovery)
args->possible_duplicates+= args->result->tables->elements() - old_elements;
}
return 0;
}
int ha_discover_table_names(THD *thd, LEX_STRING *db, MY_DIR *dirp,
handlerton::discovered_list *result)
Discovered_table_list *result)
{
int error;
DBUG_ENTER("ha_discover_table_names");
st_discover_names_args args= {db, dirp, result};
if (engines_with_discover_table_names == 0)
DBUG_RETURN(ext_table_discovery_simple(dirp, reg_ext, result));
{
error= ext_table_discovery_simple(dirp, result);
result->sort();
}
else
{
st_discover_names_args args= {db, dirp, result, 0};
error= extension_based_table_discovery(dirp, reg_ext, result);
/* extension_based_table_discovery relies on dirp being sorted */
my_qsort(dirp->dir_entry, dirp->number_of_files,
sizeof(FILEINFO), cmp_file_names);
if (!error)
error= plugin_foreach(thd, discover_names, MYSQL_STORAGE_ENGINE_PLUGIN,
&args);
error= extension_based_table_discovery(dirp, reg_ext, result) ||
plugin_foreach(thd, discover_names,
MYSQL_STORAGE_ENGINE_PLUGIN, &args);
result->sort();
if (args.possible_duplicates > 0)
result->remove_duplicates();
}
DBUG_RETURN(error);
}

25
sql/handler.h
View File

@ -31,6 +31,7 @@
#include "thr_lock.h" /* thr_lock_type, THR_LOCK_DATA */
#include "sql_cache.h"
#include "structs.h" /* SHOW_COMP_OPTION */
#include "sql_array.h" /* Dynamic_array<> */
#include <my_compare.h>
#include <ft_global.h>
@ -3101,14 +3102,30 @@ int ha_delete_table(THD *thd, handlerton *db_type, const char *path,
bool ha_show_status(THD *thd, handlerton *db_type, enum ha_stat_type stat);
/* discovery */
#ifdef MYSQL_SERVER
class Discovered_table_list: public handlerton::discovered_list
{
THD *thd;
const char *wild, *wend;
public:
Dynamic_array<LEX_STRING*> *tables;
Discovered_table_list(THD *thd_arg, Dynamic_array<LEX_STRING*> *tables_arg,
const LEX_STRING *wild_arg);
~Discovered_table_list() {}
bool add_table(const char *tname, size_t tlen);
bool add_file(const char *fname);
void sort();
void remove_duplicates(); // assumes that the list is sorted
};
int ha_discover_table(THD *thd, TABLE_SHARE *share);
int ha_discover_table_names(THD *thd, LEX_STRING *db, MY_DIR *dirp,
handlerton::discovered_list *result);
Discovered_table_list *result);
bool ha_table_exists(THD *thd, const char *db, const char *table_name,
handlerton **hton= 0);
#ifdef MYSQL_SERVER
extern volatile int32 engines_with_discover_table_names;
#endif
/* key cache */

2
sql/item_subselect.cc
View File

@ -2935,7 +2935,7 @@ bool Item_exists_subselect::exists2in_processor(uchar *opt_arg)
res= TRUE;
goto out;
}
for (int i= 0; i < eqs.elements(); i++)
for (size_t i= 0; i < eqs.elements(); i++)
{
if (optimizer->arguments()[0]->maybe_null)
{

9
sql/sql_array.h
View File

@ -104,7 +104,7 @@ public:
MYF(MY_THREAD_SPECIFIC));
}
Elem& at(int idx)
Elem& at(size_t idx)
{
return *(((Elem*)array.buffer) + idx);
}
@ -129,11 +129,16 @@ public:
return (insert_dynamic(&array, (uchar*)&el));
}
int elements()
size_t elements()
{
return array.elements;
}
void set_elements(size_t n)
{
array.elements= n;
}
~Dynamic_array()
{
delete_dynamic(&array);

81
sql/sql_show.cc
View File

@ -687,59 +687,6 @@ db_name_is_in_ignore_db_dirs_list(const char *directory)
return my_hash_search(&ignore_db_dirs_hash, (uchar *) buff, buff_len)!=NULL;
}
class Discovered_table_list: public handlerton::discovered_list
{
THD *thd;
const char *wild;
size_t wild_length;
Dynamic_array<LEX_STRING*> *tables;
public:
Discovered_table_list(THD *thd_arg, Dynamic_array<LEX_STRING*> *tables_arg,
const char *wild_arg)
{
thd= thd_arg;
tables= tables_arg;
if (wild_arg && wild_arg[0])
{
wild= wild_arg;
wild_length= strlen(wild_arg);
}
else
wild= 0;
}
~Discovered_table_list() {}
bool add_table(const char *tname, size_t tlen)
{
if (wild && my_wildcmp(files_charset_info, tname, tname + tlen,
wild, wild + wild_length,
wild_prefix, wild_one, wild_many))
return 0;
LEX_STRING *name= thd->make_lex_string(tname, tlen);
if (!name || tables->append(name))
return 1;
return 0;
}
bool add_file(const char *fname)
{
char tname[SAFE_NAME_LEN + 1];
size_t tlen= filename_to_tablename(fname, tname, sizeof(tname));
return add_table(tname, tlen);
}
};
extern "C" {
static int cmp_table_names(LEX_STRING * const *a, LEX_STRING * const *b)
{
return my_strnncoll(&my_charset_bin,
(const uchar*)((*a)->str), (*a)->length,
(const uchar*)((*b)->str), (*b)->length);
}
}
enum find_files_result {
FIND_FILES_OK,
FIND_FILES_OOM,
@ -767,20 +714,13 @@ enum find_files_result {
static find_files_result
find_files(THD *thd, Dynamic_array<LEX_STRING*> *files, LEX_STRING *db,
const char *path, const char *wild)
const char *path, const LEX_STRING *wild)
{
MY_DIR *dirp;
myf my_dir_flags= MY_THREAD_SPECIFIC;
Discovered_table_list tl(thd, files, wild);
DBUG_ENTER("find_files");
if (!db)
my_dir_flags|= MY_WANT_STAT;
if (engines_with_discover_table_names)
my_dir_flags|= MY_WANT_SORT;
if (!(dirp = my_dir(path, my_dir_flags)))
if (!(dirp = my_dir(path, MY_THREAD_SPECIFIC | (db ? 0 : MY_WANT_STAT))))
{
if (my_errno == ENOENT)
my_error(ER_BAD_DB_ERROR, MYF(ME_BELL | ME_WAITTANG), db->str);
@ -819,6 +759,7 @@ find_files(THD *thd, Dynamic_array<LEX_STRING*> *files, LEX_STRING *db,
if (tl.add_file(file->name))
goto err;
}
tl.sort();
}
else
{
@ -826,11 +767,9 @@ find_files(THD *thd, Dynamic_array<LEX_STRING*> *files, LEX_STRING *db,
goto err;
}
DBUG_PRINT("info",("found: %d files", files->elements()));
DBUG_PRINT("info",("found: %zu files", files->elements()));
my_dirend(dirp);
files->sort(cmp_table_names);
DBUG_RETURN(FIND_FILES_OK);
err:
@ -3716,7 +3655,7 @@ int make_db_list(THD *thd, Dynamic_array<LEX_STRING*> *files,
return 1;
}
return find_files(thd, files, 0, mysql_data_home,
lookup_field_vals->db_value.str);
&lookup_field_vals->db_value);
}
@ -3747,7 +3686,7 @@ int make_db_list(THD *thd, Dynamic_array<LEX_STRING*> *files,
*/
if (files->append_val(&INFORMATION_SCHEMA_NAME))
return 1;
return find_files(thd, files, 0, mysql_data_home, NullS);
return find_files(thd, files, 0, mysql_data_home, &null_lex_str);
}
@ -3891,7 +3830,7 @@ make_table_name_list(THD *thd, Dynamic_array<LEX_STRING*> *table_names,
lookup_field_vals->table_value.str));
find_files_result res= find_files(thd, table_names, db_name, path,
lookup_field_vals->table_value.str);
&lookup_field_vals->table_value);
if (res != FIND_FILES_OK)
{
/*
@ -4633,7 +4572,7 @@ int get_all_tables(THD *thd, TABLE_LIST *tables, COND *cond)
if (make_db_list(thd, &db_names, &lookup_field_vals))
goto err;
for (int i=0; i < db_names.elements(); i++)
for (size_t i=0; i < db_names.elements(); i++)
{
LEX_STRING *db_name= db_names.at(i);
#ifndef NO_EMBEDDED_ACCESS_CHECKS
@ -4652,7 +4591,7 @@ int get_all_tables(THD *thd, TABLE_LIST *tables, COND *cond)
if (res)
goto err;
for (int i=0; i < table_names.elements(); i++)
for (size_t i=0; i < table_names.elements(); i++)
{
LEX_STRING *table_name= table_names.at(i);
@ -4800,7 +4739,7 @@ int fill_schema_schemata(THD *thd, TABLE_LIST *tables, COND *cond)
DBUG_RETURN(0);
}
for (int i=0; i < db_names.elements(); i++)
for (size_t i=0; i < db_names.elements(); i++)
{
LEX_STRING *db_name= db_names.at(i);
if (db_name == &INFORMATION_SCHEMA_NAME)

8
storage/sphinx/ha_sphinx.cc
View File

@ -1285,7 +1285,7 @@ CSphSEQuery::~CSphSEQuery ()
SafeDeleteArray ( m_sQueryBuffer );
SafeDeleteArray ( m_pWeights );
SafeDeleteArray ( m_pBuf );
for ( int i=0; i<m_dOverrides.elements(); i++ )
for ( size_t i=0; i<m_dOverrides.elements(); i++ )
SafeDelete ( m_dOverrides.at(i) );
SPH_VOID_RET();
}
@ -1865,7 +1865,7 @@ int CSphSEQuery::BuildRequest ( char ** ppBuffer )
iReqSize += 8 + strlen(m_sFieldWeight[i] );
// overrides
iReqSize += 4;
for ( int i=0; i<m_dOverrides.elements(); i++ )
for ( size_t i=0; i<m_dOverrides.elements(); i++ )
{
CSphSEQuery::Override_t * pOverride = m_dOverrides.at(i);
const uint32 uSize = pOverride->m_iType==SPH_ATTR_BIGINT ? 16 : 12; // id64 + value
@ -1972,13 +1972,13 @@ int CSphSEQuery::BuildRequest ( char ** ppBuffer )
// overrides
SendInt ( m_dOverrides.elements() );
for ( int i=0; i<m_dOverrides.elements(); i++ )
for ( size_t i=0; i<m_dOverrides.elements(); i++ )
{
CSphSEQuery::Override_t * pOverride = m_dOverrides.at(i);
SendString ( pOverride->m_sName );
SendDword ( pOverride->m_iType );
SendInt ( pOverride->m_dIds.elements() );
for ( int j=0; j<pOverride->m_dIds.elements(); j++ )
for ( size_t j=0; j<pOverride->m_dIds.elements(); j++ )
{
SendUint64 ( pOverride->m_dIds.at(j) );
if ( pOverride->m_iType==SPH_ATTR_FLOAT )