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016bff8adcc2332772b51f8dbdc5a3d926f5a04c
mariadb/sql/sql_help.cc
monty@mysql.com/narttu.mysql.fi 088e2395f1 WL#3817: Simplify string / memory area types and make things more consistent (first part) 
The following type conversions was done:

- Changed byte to uchar
- Changed gptr to uchar*
- Change my_string to char *
- Change my_size_t to size_t
- Change size_s to size_t

Removed declaration of byte, gptr, my_string, my_size_t and size_s. 

Following function parameter changes was done:
- All string functions in mysys/strings was changed to use size_t
  instead of uint for string lengths.
- All read()/write() functions changed to use size_t (including vio).
- All protocoll functions changed to use size_t instead of uint
- Functions that used a pointer to a string length was changed to use size_t*
- Changed malloc(), free() and related functions from using gptr to use void *
  as this requires fewer casts in the code and is more in line with how the
  standard functions work.
- Added extra length argument to dirname_part() to return the length of the
  created string.
- Changed (at least) following functions to take uchar* as argument:
  - db_dump()
  - my_net_write()
  - net_write_command()
  - net_store_data()
  - DBUG_DUMP()
  - decimal2bin() & bin2decimal()
- Changed my_compress() and my_uncompress() to use size_t. Changed one
  argument to my_uncompress() from a pointer to a value as we only return
  one value (makes function easier to use).
- Changed type of 'pack_data' argument to packfrm() to avoid casts.
- Changed in readfrm() and writefrom(), ha_discover and handler::discover()
  the type for argument 'frmdata' to uchar** to avoid casts.
- Changed most Field functions to use uchar* instead of char* (reduced a lot of
  casts).
- Changed field->val_xxx(xxx, new_ptr) to take const pointers.

Other changes:
- Removed a lot of not needed casts
- Added a few new cast required by other changes
- Added some cast to my_multi_malloc() arguments for safety (as string lengths
  needs to be uint, not size_t).
- Fixed all calls to hash-get-key functions to use size_t*. (Needed to be done
  explicitely as this conflict was often hided by casting the function to
  hash_get_key).
- Changed some buffers to memory regions to uchar* to avoid casts.
- Changed some string lengths from uint to size_t.
- Changed field->ptr to be uchar* instead of char*. This allowed us to
  get rid of a lot of casts.
- Some changes from true -> TRUE, false -> FALSE, unsigned char -> uchar
- Include zlib.h in some files as we needed declaration of crc32()
- Changed MY_FILE_ERROR to be (size_t) -1.
- Changed many variables to hold the result of my_read() / my_write() to be
  size_t. This was needed to properly detect errors (which are
  returned as (size_t) -1).
- Removed some very old VMS code
- Changed packfrm()/unpackfrm() to not be depending on uint size
  (portability fix)
- Removed windows specific code to restore cursor position as this
  causes slowdown on windows and we should not mix read() and pread()
  calls anyway as this is not thread safe. Updated function comment to
  reflect this. Changed function that depended on original behavior of
  my_pwrite() to itself restore the cursor position (one such case).
- Added some missing checking of return value of malloc().
- Changed definition of MOD_PAD_CHAR_TO_FULL_LENGTH to avoid 'long' overflow.
- Changed type of table_def::m_size from my_size_t to ulong to reflect that
  m_size is the number of elements in the array, not a string/memory
  length.
- Moved THD::max_row_length() to table.cc (as it's not depending on THD).
  Inlined max_row_length_blob() into this function.
- More function comments
- Fixed some compiler warnings when compiled without partitions.
- Removed setting of LEX_STRING() arguments in declaration (portability fix).
- Some trivial indentation/variable name changes.
- Some trivial code simplifications:
  - Replaced some calls to alloc_root + memcpy to use
    strmake_root()/strdup_root().
  - Changed some calls from memdup() to strmake() (Safety fix)
  - Simpler loops in client-simple.c
2007-05-10 12:59:39 +03:00

794 lines
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/* Copyright (C) 2000 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include "mysql_priv.h"
struct st_find_field
{
const char *table_name, *field_name;
Field *field;
};
/* Used fields */
static struct st_find_field init_used_fields[]=
{
{ "help_topic", "help_topic_id", 0},
{ "help_topic", "name", 0},
{ "help_topic", "help_category_id", 0},
{ "help_topic", "description", 0},
{ "help_topic", "example", 0},
{ "help_category", "help_category_id", 0},
{ "help_category", "parent_category_id", 0},
{ "help_category", "name", 0},
{ "help_keyword", "help_keyword_id", 0},
{ "help_keyword", "name", 0},
{ "help_relation", "help_topic_id", 0},
{ "help_relation", "help_keyword_id", 0}
};
enum enum_used_fields
{
help_topic_help_topic_id= 0,
help_topic_name,
help_topic_help_category_id,
help_topic_description,
help_topic_example,
help_category_help_category_id,
help_category_parent_category_id,
help_category_name,
help_keyword_help_keyword_id,
help_keyword_name,
help_relation_help_topic_id,
help_relation_help_keyword_id
};
/*
Fill st_find_field structure with pointers to fields
SYNOPSIS
init_fields()
thd Thread handler
tables list of all tables for fields
find_fields array of structures
count size of previous array
RETURN VALUES
0 all ok
1 one of the fileds was not found
*/
static bool init_fields(THD *thd, TABLE_LIST *tables,
struct st_find_field *find_fields, uint count)
{
Name_resolution_context *context= &thd->lex->select_lex.context;
DBUG_ENTER("init_fields");
context->resolve_in_table_list_only(tables);
for (; count-- ; find_fields++)
{
/* We have to use 'new' here as field will be re_linked on free */
Item_field *field= new Item_field(context,
"mysql", find_fields->table_name,
find_fields->field_name);
if (!(find_fields->field= find_field_in_tables(thd, field, tables, NULL,
0, REPORT_ALL_ERRORS, 1,
TRUE)))
DBUG_RETURN(1);
bitmap_set_bit(find_fields->field->table->read_set,
find_fields->field->field_index);
/* To make life easier when setting values in keys */
bitmap_set_bit(find_fields->field->table->write_set,
find_fields->field->field_index);
}
DBUG_RETURN(0);
}
/*
Returns variants of found topic for help (if it is just single topic,
returns description and example, or else returns only names..)
SYNOPSIS
memorize_variant_topic()
thd Thread handler
topics Table of topics
count number of alredy found topics
find_fields Filled array of information for work with fields
RETURN VALUES
names array of names of found topics (out)
name name of found topic (out)
description description of found topic (out)
example example for found topic (out)
NOTE
Field 'names' is set only if more than one topic is found.
Fields 'name', 'description', 'example' are set only if
found exactly one topic.
*/
void memorize_variant_topic(THD *thd, TABLE *topics, int count,
struct st_find_field *find_fields,
List<String> *names,
String *name, String *description, String *example)
{
DBUG_ENTER("memorize_variant_topic");
MEM_ROOT *mem_root= thd->mem_root;
if (count==0)
{
get_field(mem_root,find_fields[help_topic_name].field, name);
get_field(mem_root,find_fields[help_topic_description].field, description);
get_field(mem_root,find_fields[help_topic_example].field, example);
}
else
{
if (count == 1)
names->push_back(name);
String *new_name= new (thd->mem_root) String;
get_field(mem_root,find_fields[help_topic_name].field,new_name);
names->push_back(new_name);
}
DBUG_VOID_RETURN;
}
/*
Look for topics by mask
SYNOPSIS
search_topics()
thd Thread handler
topics Table of topics
find_fields Filled array of info for fields
select Function to test for matching help topic.
Normally 'help_topic.name like 'bit%'
RETURN VALUES
# number of topics found
names array of names of found topics (out)
name name of found topic (out)
description description of found topic (out)
example example for found topic (out)
NOTE
Field 'names' is set only if more than one topic was found.
Fields 'name', 'description', 'example' are set only if
exactly one topic was found.
*/
int search_topics(THD *thd, TABLE *topics, struct st_find_field *find_fields,
SQL_SELECT *select, List<String> *names,
String *name, String *description, String *example)
{
DBUG_ENTER("search_topics");
int count= 0;
READ_RECORD read_record_info;
init_read_record(&read_record_info, thd, topics, select,1,0);
while (!read_record_info.read_record(&read_record_info))
{
if (!select->cond->val_int()) // Doesn't match like
continue;
memorize_variant_topic(thd,topics,count,find_fields,
names,name,description,example);
count++;
}
end_read_record(&read_record_info);
DBUG_RETURN(count);
}
/*
Look for keyword by mask
SYNOPSIS
search_keyword()
thd Thread handler
keywords Table of keywords
find_fields Filled array of info for fields
select Function to test for matching keyword.
Normally 'help_keyword.name like 'bit%'
key_id help_keyword_if of found topics (out)
RETURN VALUES
0 didn't find any topics matching the mask
1 found exactly one topic matching the mask
2 found more then one topic matching the mask
*/
int search_keyword(THD *thd, TABLE *keywords, struct st_find_field *find_fields,
SQL_SELECT *select, int *key_id)
{
DBUG_ENTER("search_keyword");
int count= 0;
READ_RECORD read_record_info;
init_read_record(&read_record_info, thd, keywords, select,1,0);
while (!read_record_info.read_record(&read_record_info) && count<2)
{
if (!select->cond->val_int()) // Dosn't match like
continue;
*key_id= (int)find_fields[help_keyword_help_keyword_id].field->val_int();
count++;
}
end_read_record(&read_record_info);
DBUG_RETURN(count);
}
/*
Look for all topics with keyword
SYNOPSIS
get_topics_for_keyword()
thd Thread handler
topics Table of topics
relations Table of m:m relation "topic/keyword"
find_fields Filled array of info for fields
key_id Primary index to use to find for keyword
RETURN VALUES
# number of topics found
names array of name of found topics (out)
name name of found topic (out)
description description of found topic (out)
example example for found topic (out)
NOTE
Field 'names' is set only if more than one topic was found.
Fields 'name', 'description', 'example' are set only if
exactly one topic was found.
*/
int get_topics_for_keyword(THD *thd, TABLE *topics, TABLE *relations,
struct st_find_field *find_fields, int16 key_id,
List<String> *names,
String *name, String *description, String *example)
{
uchar buff[8]; // Max int length
int count= 0;
int iindex_topic, iindex_relations;
Field *rtopic_id, *rkey_id;
DBUG_ENTER("get_topics_for_keyword");
if ((iindex_topic= find_type((char*) primary_key_name,
&topics->s->keynames, 1+2)-1)<0 ||
(iindex_relations= find_type((char*) primary_key_name,
&relations->s->keynames, 1+2)-1)<0)
{
my_message(ER_CORRUPT_HELP_DB, ER(ER_CORRUPT_HELP_DB), MYF(0));
DBUG_RETURN(-1);
}
rtopic_id= find_fields[help_relation_help_topic_id].field;
rkey_id= find_fields[help_relation_help_keyword_id].field;
topics->file->ha_index_init(iindex_topic,1);
relations->file->ha_index_init(iindex_relations,1);
rkey_id->store((longlong) key_id, TRUE);
rkey_id->get_key_image(buff, rkey_id->pack_length(), Field::itRAW);
int key_res= relations->file->index_read(relations->record[0],
buff, (key_part_map) 1,
HA_READ_KEY_EXACT);
for ( ;
!key_res && key_id == (int16) rkey_id->val_int() ;
key_res= relations->file->index_next(relations->record[0]))
{
uchar topic_id_buff[8];
longlong topic_id= rtopic_id->val_int();
Field *field= find_fields[help_topic_help_topic_id].field;
field->store((longlong) topic_id, TRUE);
field->get_key_image(topic_id_buff, field->pack_length(), Field::itRAW);
if (!topics->file->index_read(topics->record[0], topic_id_buff,
(key_part_map)1, HA_READ_KEY_EXACT))
{
memorize_variant_topic(thd,topics,count,find_fields,
names,name,description,example);
count++;
}
}
topics->file->ha_index_end();
relations->file->ha_index_end();
DBUG_RETURN(count);
}
/*
Look for categories by mask
SYNOPSIS
search_categories()
thd THD for init_read_record
categories Table of categories
find_fields Filled array of info for fields
select Function to test for if matching help topic.
Normally 'help_vategory.name like 'bit%'
names List of found categories names (out)
res_id Primary index of found category (only if
found exactly one category)
RETURN VALUES
# Number of categories found
*/
int search_categories(THD *thd, TABLE *categories,
struct st_find_field *find_fields,
SQL_SELECT *select, List<String> *names, int16 *res_id)
{
Field *pfname= find_fields[help_category_name].field;
Field *pcat_id= find_fields[help_category_help_category_id].field;
int count= 0;
READ_RECORD read_record_info;
DBUG_ENTER("search_categories");
init_read_record(&read_record_info, thd, categories, select,1,0);
while (!read_record_info.read_record(&read_record_info))
{
if (select && !select->cond->val_int())
continue;
String *lname= new (thd->mem_root) String;
get_field(thd->mem_root,pfname,lname);
if (++count == 1 && res_id)
*res_id= (int16) pcat_id->val_int();
names->push_back(lname);
}
end_read_record(&read_record_info);
DBUG_RETURN(count);
}
/*
Look for all topics or subcategories of category
SYNOPSIS
get_all_items_for_category()
thd Thread handler
items Table of items
pfname Field "name" in items
select "where" part of query..
res list of finded names
*/
void get_all_items_for_category(THD *thd, TABLE *items, Field *pfname,
SQL_SELECT *select, List<String> *res)
{
DBUG_ENTER("get_all_items_for_category");
READ_RECORD read_record_info;
init_read_record(&read_record_info, thd, items, select,1,0);
while (!read_record_info.read_record(&read_record_info))
{
if (!select->cond->val_int())
continue;
String *name= new (thd->mem_root) String();
get_field(thd->mem_root,pfname,name);
res->push_back(name);
}
end_read_record(&read_record_info);
DBUG_VOID_RETURN;
}
/*
Send to client answer for help request
SYNOPSIS
send_answer_1()
protocol - protocol for sending
s1 - value of column "Name"
s2 - value of column "Description"
s3 - value of column "Example"
IMPLEMENTATION
Format used:
+----------+------------+------------+
|name |description |example |
+----------+------------+------------+
|String(64)|String(1000)|String(1000)|
+----------+------------+------------+
with exactly one row!
RETURN VALUES
1 Writing of head failed
-1 Writing of row failed
0 Successeful send
*/
int send_answer_1(Protocol *protocol, String *s1, String *s2, String *s3)
{
DBUG_ENTER("send_answer_1");
List<Item> field_list;
field_list.push_back(new Item_empty_string("name",64));
field_list.push_back(new Item_empty_string("description",1000));
field_list.push_back(new Item_empty_string("example",1000));
if (protocol->send_fields(&field_list,
Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
DBUG_RETURN(1);
protocol->prepare_for_resend();
protocol->store(s1);
protocol->store(s2);
protocol->store(s3);
if (protocol->write())
DBUG_RETURN(-1);
DBUG_RETURN(0);
}
/*
Send to client help header
SYNOPSIS
send_header_2()
protocol - protocol for sending
is_it_category - need column 'source_category_name'
IMPLEMENTATION
+- -+
|+-------------------- | +----------+--------------+
||source_category_name | |name |is_it_category|
|+-------------------- | +----------+--------------+
||String(64) | |String(64)|String(1) |
|+-------------------- | +----------+--------------+
+- -+
RETURN VALUES
result of protocol->send_fields
*/
int send_header_2(Protocol *protocol, bool for_category)
{
DBUG_ENTER("send_header_2");
List<Item> field_list;
if (for_category)
field_list.push_back(new Item_empty_string("source_category_name",64));
field_list.push_back(new Item_empty_string("name",64));
field_list.push_back(new Item_empty_string("is_it_category",1));
DBUG_RETURN(protocol->send_fields(&field_list, Protocol::SEND_NUM_ROWS |
Protocol::SEND_EOF));
}
/*
strcmp for using in qsort
SYNOPSIS
strptrcmp()
ptr1 (const void*)&str1
ptr2 (const void*)&str2
RETURN VALUES
same as strcmp
*/
extern "C" int string_ptr_cmp(const void* ptr1, const void* ptr2)
{
String *str1= *(String**)ptr1;
String *str2= *(String**)ptr2;
return strcmp(str1->c_ptr(),str2->c_ptr());
}
/*
Send to client rows in format:
column1 : <name>
column2 : <is_it_category>
SYNOPSIS
send_variant_2_list()
protocol Protocol for sending
names List of names
cat Value of the column <is_it_category>
source_name name of category for all items..
RETURN VALUES
-1 Writing fail
0 Data was successefully send
*/
int send_variant_2_list(MEM_ROOT *mem_root, Protocol *protocol,
List<String> *names,
const char *cat, String *source_name)
{
DBUG_ENTER("send_variant_2_list");
String **pointers= (String**)alloc_root(mem_root,
sizeof(String*)*names->elements);
String **pos;
String **end= pointers + names->elements;
List_iterator<String> it(*names);
for (pos= pointers; pos!=end; (*pos++= it++));
qsort(pointers,names->elements,sizeof(String*),string_ptr_cmp);
for (pos= pointers; pos!=end; pos++)
{
protocol->prepare_for_resend();
if (source_name)
protocol->store(source_name);
protocol->store(*pos);
protocol->store(cat,1,&my_charset_latin1);
if (protocol->write())
DBUG_RETURN(-1);
}
DBUG_RETURN(0);
}
/*
Prepare simple SQL_SELECT table.* WHERE <Item>
SYNOPSIS
prepare_simple_select()
thd Thread handler
cond WHERE part of select
table goal table
error code of error (out)
RETURN VALUES
# created SQL_SELECT
*/
SQL_SELECT *prepare_simple_select(THD *thd, Item *cond,
TABLE *table, int *error)
{
if (!cond->fixed)
cond->fix_fields(thd, &cond); // can never fail
/* Assume that no indexes cover all required fields */
table->covering_keys.clear_all();
SQL_SELECT *res= make_select(table, 0, 0, cond, 0, error);
if (*error || (res && res->check_quick(thd, 0, HA_POS_ERROR)) ||
(res && res->quick && res->quick->reset()))
{
delete res;
res=0;
}
return res;
}
/*
Prepare simple SQL_SELECT table.* WHERE table.name LIKE mask
SYNOPSIS
prepare_select_for_name()
thd Thread handler
mask mask for compare with name
mlen length of mask
tables list of tables, used in WHERE
table goal table
pfname field "name" in table
error code of error (out)
RETURN VALUES
# created SQL_SELECT
*/
SQL_SELECT *prepare_select_for_name(THD *thd, const char *mask, uint mlen,
TABLE_LIST *tables, TABLE *table,
Field *pfname, int *error)
{
Item *cond= new Item_func_like(new Item_field(pfname),
new Item_string(mask,mlen,pfname->charset()),
new Item_string("\\",1,&my_charset_latin1),
FALSE);
if (thd->is_fatal_error)
return 0; // OOM
return prepare_simple_select(thd, cond, table, error);
}
/*
Server-side function 'help'
SYNOPSIS
mysqld_help()
thd Thread handler
RETURN VALUES
FALSE Success
TRUE Error and send_error already commited
*/
bool mysqld_help(THD *thd, const char *mask)
{
Protocol *protocol= thd->protocol;
SQL_SELECT *select;
st_find_field used_fields[array_elements(init_used_fields)];
TABLE_LIST *leaves= 0;
TABLE_LIST tables[4];
List<String> topics_list, categories_list, subcategories_list;
String name, description, example;
int count_topics, count_categories, error;
uint mlen= strlen(mask);
size_t i;
MEM_ROOT *mem_root= thd->mem_root;
DBUG_ENTER("mysqld_help");
bzero((uchar*)tables,sizeof(tables));
tables[0].alias= tables[0].table_name= (char*) "help_topic";
tables[0].lock_type= TL_READ;
tables[0].next_global= tables[0].next_local=
tables[0].next_name_resolution_table= &tables[1];
tables[1].alias= tables[1].table_name= (char*) "help_category";
tables[1].lock_type= TL_READ;
tables[1].next_global= tables[1].next_local=
tables[1].next_name_resolution_table= &tables[2];
tables[2].alias= tables[2].table_name= (char*) "help_relation";
tables[2].lock_type= TL_READ;
tables[2].next_global= tables[2].next_local=
tables[2].next_name_resolution_table= &tables[3];
tables[3].alias= tables[3].table_name= (char*) "help_keyword";
tables[3].lock_type= TL_READ;
tables[0].db= tables[1].db= tables[2].db= tables[3].db= (char*) "mysql";
Open_tables_state open_tables_state_backup;
if (open_system_tables_for_read(thd, tables, &open_tables_state_backup))
goto error2;
/*
Init tables and fields to be usable from items
tables do not contain VIEWs => we can pass 0 as conds
*/
thd->lex->select_lex.context.table_list=
thd->lex->select_lex.context.first_name_resolution_table= &tables[0];
if (setup_tables(thd, &thd->lex->select_lex.context,
&thd->lex->select_lex.top_join_list,
tables, &leaves, FALSE))
goto error;
memcpy((char*) used_fields, (char*) init_used_fields, sizeof(used_fields));
if (init_fields(thd, tables, used_fields, array_elements(used_fields)))
goto error;
for (i=0; i<sizeof(tables)/sizeof(TABLE_LIST); i++)
tables[i].table->file->init_table_handle_for_HANDLER();
if (!(select=
prepare_select_for_name(thd,mask,mlen,tables,tables[0].table,
used_fields[help_topic_name].field,&error)))
goto error;
count_topics= search_topics(thd,tables[0].table,used_fields,
select,&topics_list,
&name, &description, &example);
delete select;
if (count_topics == 0)
{
int key_id;
if (!(select=
prepare_select_for_name(thd,mask,mlen,tables,tables[3].table,
used_fields[help_keyword_name].field,
&error)))
goto error;
count_topics= search_keyword(thd,tables[3].table, used_fields, select,
&key_id);
delete select;
count_topics= (count_topics != 1) ? 0 :
get_topics_for_keyword(thd,tables[0].table,tables[2].table,
used_fields,key_id,&topics_list,&name,
&description,&example);
}
if (count_topics == 0)
{
int16 category_id;
Field *cat_cat_id= used_fields[help_category_parent_category_id].field;
if (!(select=
prepare_select_for_name(thd,mask,mlen,tables,tables[1].table,
used_fields[help_category_name].field,
&error)))
goto error;
count_categories= search_categories(thd, tables[1].table, used_fields,
select,
&categories_list,&category_id);
delete select;
if (!count_categories)
{
if (send_header_2(protocol,FALSE))
goto error;
}
else if (count_categories > 1)
{
if (send_header_2(protocol,FALSE) ||
send_variant_2_list(mem_root,protocol,&categories_list,"Y",0))
goto error;
}
else
{
Field *topic_cat_id= used_fields[help_topic_help_category_id].field;
Item *cond_topic_by_cat=
new Item_func_equal(new Item_field(topic_cat_id),
new Item_int((int32)category_id));
Item *cond_cat_by_cat=
new Item_func_equal(new Item_field(cat_cat_id),
new Item_int((int32)category_id));
if (!(select= prepare_simple_select(thd, cond_topic_by_cat,
tables[0].table, &error)))
goto error;
get_all_items_for_category(thd,tables[0].table,
used_fields[help_topic_name].field,
select,&topics_list);
delete select;
if (!(select= prepare_simple_select(thd, cond_cat_by_cat,
tables[1].table, &error)))
goto error;
get_all_items_for_category(thd,tables[1].table,
used_fields[help_category_name].field,
select,&subcategories_list);
delete select;
String *cat= categories_list.head();
if (send_header_2(protocol, TRUE) ||
send_variant_2_list(mem_root,protocol,&topics_list, "N",cat) ||
send_variant_2_list(mem_root,protocol,&subcategories_list,"Y",cat))
goto error;
}
}
else if (count_topics == 1)
{
if (send_answer_1(protocol,&name,&description,&example))
goto error;
}
else
{
/* First send header and functions */
if (send_header_2(protocol, FALSE) ||
send_variant_2_list(mem_root,protocol, &topics_list, "N", 0))
goto error;
if (!(select=
prepare_select_for_name(thd,mask,mlen,tables,tables[1].table,
used_fields[help_category_name].field,&error)))
goto error;
search_categories(thd, tables[1].table, used_fields,
select,&categories_list, 0);
delete select;
/* Then send categories */
if (send_variant_2_list(mem_root,protocol, &categories_list, "Y", 0))
goto error;
}
send_eof(thd);
close_system_tables(thd, &open_tables_state_backup);
DBUG_RETURN(FALSE);
error:
close_system_tables(thd, &open_tables_state_backup);
error2:
DBUG_RETURN(TRUE);
}
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