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mariadb/sql/parse_file.cc
Oleksandr Byelkin f65ba9aeb7 MDEV-17124: mariadb 10.1.34, views and prepared statements: ERROR 1615 (HY000): Prepared statement needs to be re-prepared 
The problem is that if table definition cache (TDC) is full of real tables
which are in tables cache, view definition can not stay there so will be
removed by its own underlying tables.
In situation above old mechanism of detection matching definition in PS
and current version always require reprepare and so prevent executing
the PS.

One work around is to increase TDC, other - improve version check for
views/triggers (which is done here). Now in suspicious cases we check:
 - timestamp (microseconds) of the view to be sure that version really
   have changed;
 - time (microseconds) of creation of a trigger related to time
   (microseconds) of statement preparation.
2022-09-30 12:11:37 +02:00

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/* Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
/**
@file
@brief
Text .frm files management routines
*/
#include "mariadb.h"
#include "sql_priv.h"
#include "parse_file.h"
#include "unireg.h" // CREATE_MODE
#include "sql_table.h" // build_table_filename
#include <m_ctype.h>
#include <my_dir.h>
/* from sql_db.cc */
extern long mysql_rm_arc_files(THD *thd, MY_DIR *dirp, const char *org_path);
/**
Write string with escaping.
@param file IO_CACHE for record
@param val_s string for writing
@retval
FALSE OK
@retval
TRUE error
*/
static my_bool
write_escaped_string(IO_CACHE *file, LEX_STRING *val_s)
{
char *eos= val_s->str + val_s->length;
char *ptr= val_s->str;
for (; ptr < eos; ptr++)
{
/*
Should be in sync with read_escaped_string() and
parse_quoted_escaped_string()
*/
switch(*ptr) {
case '\\': // escape character
if (my_b_write(file, (const uchar *)STRING_WITH_LEN("\\\\")))
return TRUE;
break;
case '\n': // parameter value delimiter
if (my_b_write(file, (const uchar *)STRING_WITH_LEN("\\n")))
return TRUE;
break;
case '\0': // problem for some string processing utilities
if (my_b_write(file, (const uchar *)STRING_WITH_LEN("\\0")))
return TRUE;
break;
case 26: // problem for windows utilities (Ctrl-Z)
if (my_b_write(file, (const uchar *)STRING_WITH_LEN("\\z")))
return TRUE;
break;
case '\'': // list of string delimiter
if (my_b_write(file, (const uchar *)STRING_WITH_LEN("\\\'")))
return TRUE;
break;
default:
if (my_b_write(file, (const uchar *)ptr, 1))
return TRUE;
}
}
return FALSE;
}
static ulonglong view_algo_to_frm(ulonglong val)
{
switch(val)
{
case VIEW_ALGORITHM_UNDEFINED:
return VIEW_ALGORITHM_UNDEFINED_FRM;
case VIEW_ALGORITHM_MERGE:
return VIEW_ALGORITHM_MERGE_FRM;
case VIEW_ALGORITHM_TMPTABLE:
return VIEW_ALGORITHM_TMPTABLE_FRM;
}
DBUG_ASSERT(0); /* Should never happen */
return VIEW_ALGORITHM_UNDEFINED;
}
static ulonglong view_algo_from_frm(ulonglong val)
{
switch(val)
{
case VIEW_ALGORITHM_UNDEFINED_FRM:
return VIEW_ALGORITHM_UNDEFINED;
case VIEW_ALGORITHM_MERGE_FRM:
return VIEW_ALGORITHM_MERGE;
case VIEW_ALGORITHM_TMPTABLE_FRM:
return VIEW_ALGORITHM_TMPTABLE;
}
/*
Early versions of MariaDB 5.2/5.3 had identical in-memory and frm values
Return input value.
*/
return val;
}
/**
Write parameter value to IO_CACHE.
@param file pointer to IO_CACHE structure for writing
@param base pointer to data structure
@param parameter pointer to parameter descriptor
@retval
FALSE OK
@retval
TRUE error
*/
static my_bool
write_parameter(IO_CACHE *file, const uchar* base, File_option *parameter)
{
char num_buf[20]; // buffer for numeric operations
// string for numeric operations
String num(num_buf, sizeof(num_buf), &my_charset_bin);
DBUG_ENTER("write_parameter");
switch (parameter->type) {
case FILE_OPTIONS_STRING:
{
LEX_STRING *val_s= (LEX_STRING *)(base + parameter->offset);
if (my_b_write(file, (const uchar *)val_s->str, val_s->length))
DBUG_RETURN(TRUE);
break;
}
case FILE_OPTIONS_ESTRING:
{
if (write_escaped_string(file, (LEX_STRING *)(base + parameter->offset)))
DBUG_RETURN(TRUE);
break;
}
case FILE_OPTIONS_ULONGLONG:
case FILE_OPTIONS_VIEW_ALGO:
{
ulonglong val= *(ulonglong *)(base + parameter->offset);
if (parameter->type == FILE_OPTIONS_VIEW_ALGO)
val= view_algo_to_frm(val);
num.set(val, &my_charset_bin);
if (my_b_write(file, (const uchar *)num.ptr(), num.length()))
DBUG_RETURN(TRUE);
break;
}
case FILE_OPTIONS_TIMESTAMP:
{
/* string have to be allocated already */
LEX_STRING *val_s= (LEX_STRING *)(base + parameter->offset);
// number of microseconds since Epoch, timezone-independent
my_hrtime_t tm= my_hrtime();
// Paded to 19 characters for compatibility
val_s->length= snprintf(val_s->str, MICROSECOND_TIMESTAMP_BUFFER_SIZE,
"%019lld", tm.val);
DBUG_ASSERT(val_s->length == MICROSECOND_TIMESTAMP_BUFFER_SIZE-1);
if (my_b_write(file, (const uchar *)val_s->str,
PARSE_FILE_TIMESTAMPLENGTH))
DBUG_RETURN(TRUE);
break;
}
case FILE_OPTIONS_STRLIST:
{
List_iterator_fast<LEX_STRING> it(*((List<LEX_STRING>*)
(base + parameter->offset)));
bool first= 1;
LEX_STRING *str;
while ((str= it++))
{
// We need ' ' after string to detect list continuation
if ((!first && my_b_write(file, (const uchar *)STRING_WITH_LEN(" "))) ||
my_b_write(file, (const uchar *)STRING_WITH_LEN("\'")) ||
write_escaped_string(file, str) ||
my_b_write(file, (const uchar *)STRING_WITH_LEN("\'")))
{
DBUG_RETURN(TRUE);
}
first= 0;
}
break;
}
case FILE_OPTIONS_ULLLIST:
{
List_iterator_fast<ulonglong> it(*((List<ulonglong>*)
(base + parameter->offset)));
bool first= 1;
ulonglong *val;
while ((val= it++))
{
num.set(*val, &my_charset_bin);
// We need ' ' after string to detect list continuation
if ((!first && my_b_write(file, (const uchar *)STRING_WITH_LEN(" "))) ||
my_b_write(file, (const uchar *)num.ptr(), num.length()))
{
DBUG_RETURN(TRUE);
}
first= 0;
}
break;
}
default:
DBUG_ASSERT(0); // never should happened
}
DBUG_RETURN(FALSE);
}
/**
Write new .frm.
@param dir directory where put .frm
@param file_name .frm file name
@param type .frm type string (VIEW, TABLE)
@param base base address for parameter reading (structure like
TABLE)
@param parameters parameters description
@retval
FALSE OK
@retval
TRUE error
*/
my_bool
sql_create_definition_file(const LEX_CSTRING *dir,
const LEX_CSTRING *file_name,
const LEX_CSTRING *type,
uchar* base, File_option *parameters)
{
File handler;
IO_CACHE file;
char path[FN_REFLEN+1]; // +1 to put temporary file name for sure
size_t path_end;
File_option *param;
DBUG_ENTER("sql_create_definition_file");
DBUG_PRINT("enter", ("Dir: %s, file: %s, base %p",
dir ? dir->str : "",
file_name->str, base));
if (dir)
{
fn_format(path, file_name->str, dir->str, "", MY_UNPACK_FILENAME);
path_end= strlen(path);
}
else
{
/*
if not dir is passed, it means file_name is a full path,
including dir name, file name itself, and an extension,
and with unpack_filename() executed over it.
*/
path_end= strxnmov(path, sizeof(path) - 1, file_name->str, NullS) - path;
}
// temporary file name
path[path_end]='~';
path[path_end+1]= '\0';
if ((handler= mysql_file_create(key_file_fileparser,
path, CREATE_MODE, O_RDWR | O_TRUNC,
MYF(MY_WME))) < 0)
{
DBUG_RETURN(TRUE);
}
if (init_io_cache(&file, handler, 0, WRITE_CACHE, 0L, 0, MYF(MY_WME)))
goto err_w_file;
// write header (file signature)
if (my_b_write(&file, (const uchar *)STRING_WITH_LEN("TYPE=")) ||
my_b_write(&file, (const uchar *)type->str, type->length) ||
my_b_write(&file, (const uchar *)STRING_WITH_LEN("\n")))
goto err_w_cache;
// write parameters to temporary file
for (param= parameters; param->name.str; param++)
{
if (my_b_write(&file, (const uchar *)param->name.str,
param->name.length) ||
my_b_write(&file, (const uchar *)STRING_WITH_LEN("=")) ||
write_parameter(&file, base, param) ||
my_b_write(&file, (const uchar *)STRING_WITH_LEN("\n")))
goto err_w_cache;
}
if (end_io_cache(&file))
goto err_w_file;
if (opt_sync_frm) {
if (mysql_file_sync(handler, MYF(MY_WME)))
goto err_w_file;
}
if (mysql_file_close(handler, MYF(MY_WME)))
{
DBUG_RETURN(TRUE);
}
path[path_end]='\0';
{
// rename temporary file
char path_to[FN_REFLEN];
memcpy(path_to, path, path_end+1);
path[path_end]='~';
if (mysql_file_rename(key_file_fileparser, path, path_to, MYF(MY_WME)))
{
DBUG_RETURN(TRUE);
}
}
DBUG_RETURN(FALSE);
err_w_cache:
end_io_cache(&file);
err_w_file:
mysql_file_close(handler, MYF(MY_WME));
DBUG_RETURN(TRUE);
}
/**
Renames a frm file (including backups) in same schema.
@thd thread handler
@param schema name of given schema
@param old_name original file name
@param new_db new schema
@param new_name new file name
@retval
0 OK
@retval
1 Error (only if renaming of frm failed)
*/
my_bool rename_in_schema_file(THD *thd,
const char *schema, const char *old_name,
const char *new_db, const char *new_name)
{
char old_path[FN_REFLEN + 1], new_path[FN_REFLEN + 1], arc_path[FN_REFLEN + 1];
build_table_filename(old_path, sizeof(old_path) - 1,
schema, old_name, reg_ext, 0);
build_table_filename(new_path, sizeof(new_path) - 1,
new_db, new_name, reg_ext, 0);
if (mysql_file_rename(key_file_frm, old_path, new_path, MYF(MY_WME)))
return 1;
/* check if arc_dir exists: disabled unused feature (see bug #17823). */
build_table_filename(arc_path, sizeof(arc_path) - 1, schema, "arc", "", 0);
{ // remove obsolete 'arc' directory and files if any
MY_DIR *new_dirp;
if ((new_dirp = my_dir(arc_path, MYF(MY_DONT_SORT))))
{
DBUG_PRINT("my",("Archive subdir found: %s", arc_path));
(void) mysql_rm_arc_files(thd, new_dirp, arc_path);
}
}
return 0;
}
/**
Prepare frm to parse (read to memory).
@param file_name path & filename to .frm file
@param mem_root MEM_ROOT for buffer allocation
@param bad_format_errors send errors on bad content
@note
returned pointer + 1 will be type of .frm
@return
0 - error
@return
parser object
*/
File_parser *
sql_parse_prepare(const LEX_CSTRING *file_name, MEM_ROOT *mem_root,
bool bad_format_errors)
{
MY_STAT stat_info;
size_t len;
char *buff, *end, *sign;
File_parser *parser;
File file;
DBUG_ENTER("sql_parse_prepare");
if (!mysql_file_stat(key_file_fileparser,
file_name->str, &stat_info, MYF(MY_WME)))
{
DBUG_RETURN(0);
}
if (stat_info.st_size > INT_MAX-1)
{
my_error(ER_FPARSER_TOO_BIG_FILE, MYF(0), file_name->str);
DBUG_RETURN(0);
}
if (!(parser= new(mem_root) File_parser))
{
DBUG_RETURN(0);
}
if (!(buff= (char*) alloc_root(mem_root, (size_t)(stat_info.st_size+1))))
{
DBUG_RETURN(0);
}
if ((file= mysql_file_open(key_file_fileparser, file_name->str,
O_RDONLY | O_SHARE, MYF(MY_WME))) < 0)
{
DBUG_RETURN(0);
}
if ((len= mysql_file_read(file, (uchar *)buff, (size_t)stat_info.st_size,
MYF(MY_WME))) == MY_FILE_ERROR)
{
mysql_file_close(file, MYF(MY_WME));
DBUG_RETURN(0);
}
if (mysql_file_close(file, MYF(MY_WME)))
{
DBUG_RETURN(0);
}
end= buff + len;
*end= '\0'; // barrier for more simple parsing
// 7 = 5 (TYPE=) + 1 (letter at least of type name) + 1 ('\n')
if (len < 7 ||
buff[0] != 'T' ||
buff[1] != 'Y' ||
buff[2] != 'P' ||
buff[3] != 'E' ||
buff[4] != '=')
goto frm_error;
// skip signature;
parser->file_type.str= sign= buff + 5;
while (*sign >= 'A' && *sign <= 'Z' && sign < end)
sign++;
if (*sign != '\n')
goto frm_error;
parser->file_type.length= sign - parser->file_type.str;
// EOS for file signature just for safety
*sign= '\0';
parser->end= end;
parser->start= sign + 1;
parser->content_ok= 1;
DBUG_RETURN(parser);
frm_error:
if (bad_format_errors)
{
my_error(ER_FPARSER_BAD_HEADER, MYF(0), file_name->str);
DBUG_RETURN(0);
}
DBUG_RETURN(parser); // upper level have to check parser->ok()
}
/**
parse LEX_STRING.
@param ptr pointer on string beginning
@param end pointer on symbol after parsed string end (still owned
by buffer and can be accessed
@param mem_root MEM_ROOT for parameter allocation
@param str pointer on string, where results should be stored
@retval
0 error
@retval
\# pointer on symbol after string
*/
static const char *
parse_string(const char *ptr, const char *end, MEM_ROOT *mem_root,
LEX_STRING *str)
{
// get string length
const char *eol= strchr(ptr, '\n');
if (eol >= end)
return 0;
str->length= eol - ptr;
if (!(str->str= strmake_root(mem_root, ptr, str->length)))
return 0;
return eol+1;
}
/**
read escaped string from ptr to eol in already allocated str.
@param ptr pointer on string beginning
@param eol pointer on character after end of string
@param str target string
@retval
FALSE OK
@retval
TRUE error
*/
my_bool
read_escaped_string(const char *ptr, const char *eol, LEX_STRING *str)
{
char *write_pos= str->str;
for (; ptr < eol; ptr++, write_pos++)
{
char c= *ptr;
if (c == '\\')
{
ptr++;
if (ptr >= eol)
return TRUE;
/*
Should be in sync with write_escaped_string() and
parse_quoted_escaped_string()
*/
switch(*ptr) {
case '\\':
*write_pos= '\\';
break;
case 'n':
*write_pos= '\n';
break;
case '0':
*write_pos= '\0';
break;
case 'z':
*write_pos= 26;
break;
case '\'':
*write_pos= '\'';
break;
default:
return TRUE;
}
}
else
*write_pos= c;
}
str->str[str->length= write_pos-str->str]= '\0'; // just for safety
return FALSE;
}
/**
parse \\n delimited escaped string.
@param ptr pointer on string beginning
@param end pointer on symbol after parsed string end (still owned
by buffer and can be accessed
@param mem_root MEM_ROOT for parameter allocation
@param str pointer on string, where results should be stored
@retval
0 error
@retval
\# pointer on symbol after string
*/
const char *
parse_escaped_string(const char *ptr, const char *end, MEM_ROOT *mem_root,
LEX_CSTRING *str)
{
const char *eol= strchr(ptr, '\n');
if (eol == 0 || eol >= end ||
!(str->str= (char*) alloc_root(mem_root, (eol - ptr) + 1)) ||
read_escaped_string(ptr, eol, (LEX_STRING*) str))
return 0;
return eol+1;
}
/**
parse '' delimited escaped string.
@param ptr pointer on string beginning
@param end pointer on symbol after parsed string end (still owned
by buffer and can be accessed
@param mem_root MEM_ROOT for parameter allocation
@param str pointer on string, where results should be stored
@retval
0 error
@retval
\# pointer on symbol after string
*/
static const char *
parse_quoted_escaped_string(const char *ptr, const char *end,
MEM_ROOT *mem_root, LEX_STRING *str)
{
const char *eol;
uint result_len= 0;
bool escaped= 0;
// starting '
if (*(ptr++) != '\'')
return 0;
// find ending '
for (eol= ptr; (*eol != '\'' || escaped) && eol < end; eol++)
{
if (!(escaped= (*eol == '\\' && !escaped)))
result_len++;
}
// process string
if (eol >= end ||
!(str->str= (char*) alloc_root(mem_root, result_len + 1)) ||
read_escaped_string(ptr, eol, str))
return 0;
return eol+1;
}
/**
Parser for FILE_OPTIONS_ULLLIST type value.
@param[in,out] ptr pointer to parameter
@param[in] end end of the configuration
@param[in] line pointer to the line beginning
@param[in] base base address for parameter writing (structure
like TABLE)
@param[in] parameter description
@param[in] mem_root MEM_ROOT for parameters allocation
*/
bool get_file_options_ulllist(const char *&ptr, const char *end,
const char *line,
uchar* base, File_option *parameter,
MEM_ROOT *mem_root)
{
List<ulonglong> *nlist= (List<ulonglong>*)(base + parameter->offset);
ulonglong *num;
nlist->empty();
// list parsing
while (ptr < end)
{
int not_used;
char *num_end= const_cast<char *>(end);
if (!(num= (ulonglong*)alloc_root(mem_root, sizeof(ulonglong))) ||
nlist->push_back(num, mem_root))
goto nlist_err;
*num= my_strtoll10(ptr, &num_end, &not_used);
ptr= num_end;
switch (*ptr) {
case '\n':
goto end_of_nlist;
case ' ':
// we cant go over buffer bounds, because we have \0 at the end
ptr++;
break;
default:
goto nlist_err_w_message;
}
}
end_of_nlist:
if (*(ptr++) != '\n')
goto nlist_err;
return FALSE;
nlist_err_w_message:
my_error(ER_FPARSER_ERROR_IN_PARAMETER, MYF(0), parameter->name.str, line);
nlist_err:
return TRUE;
}
/**
parse parameters.
@param base base address for parameter writing (structure like
TABLE)
@param mem_root MEM_ROOT for parameters allocation
@param parameters parameters description
@param required number of required parameters in above list. If the file
contains more parameters than "required", they will
be ignored. If the file contains less parameters
then "required", non-existing parameters will
remain their values.
@param hook hook called for unknown keys
@param hook_data some data specific for the hook
@retval
FALSE OK
@retval
TRUE error
*/
my_bool
File_parser::parse(uchar* base, MEM_ROOT *mem_root,
struct File_option *parameters, uint required,
Unknown_key_hook *hook) const
{
uint first_param= 0, found= 0;
const char *ptr= start;
const char *eol;
LEX_STRING *str;
List<LEX_STRING> *list;
DBUG_ENTER("File_parser::parse");
while (ptr < end && found < required)
{
const char *line= ptr;
if (*ptr == '#')
{
// it is comment
if (!(ptr= strchr(ptr, '\n')))
{
my_error(ER_FPARSER_EOF_IN_COMMENT, MYF(0), line);
DBUG_RETURN(TRUE);
}
ptr++;
}
else
{
File_option *parameter= parameters+first_param,
*parameters_end= parameters+required;
size_t len= 0;
for (; parameter < parameters_end; parameter++)
{
len= parameter->name.length;
// check length
if (len < (size_t)(end-ptr) && ptr[len] != '=')
continue;
// check keyword
if (memcmp(parameter->name.str, ptr, len) == 0)
break;
}
if (parameter < parameters_end)
{
found++;
/*
if we found first parameter, start search from next parameter
next time.
(this small optimisation should work, because they should be
written in same order)
*/
if (parameter == parameters+first_param)
first_param++;
// get value
ptr+= (len+1);
switch (parameter->type) {
case FILE_OPTIONS_STRING:
{
if (!(ptr= parse_string(ptr, end, mem_root,
(LEX_STRING *)(base +
parameter->offset))))
{
my_error(ER_FPARSER_ERROR_IN_PARAMETER, MYF(0),
parameter->name.str, line);
DBUG_RETURN(TRUE);
}
break;
}
case FILE_OPTIONS_ESTRING:
{
if (!(ptr= parse_escaped_string(ptr, end, mem_root,
(LEX_CSTRING *)
(base + parameter->offset))))
{
my_error(ER_FPARSER_ERROR_IN_PARAMETER, MYF(0),
parameter->name.str, line);
DBUG_RETURN(TRUE);
}
break;
}
case FILE_OPTIONS_ULONGLONG:
case FILE_OPTIONS_VIEW_ALGO:
if (!(eol= strchr(ptr, '\n')))
{
my_error(ER_FPARSER_ERROR_IN_PARAMETER, MYF(0),
parameter->name.str, line);
DBUG_RETURN(TRUE);
}
{
int not_used;
ulonglong val= (ulonglong)my_strtoll10(ptr, 0, &not_used);
if (parameter->type == FILE_OPTIONS_VIEW_ALGO)
val= view_algo_from_frm(val);
*((ulonglong*)(base + parameter->offset))= val;
}
ptr= eol+1;
break;
case FILE_OPTIONS_TIMESTAMP:
{
/* string have to be allocated already */
LEX_STRING *val= (LEX_STRING *)(base + parameter->offset);
/* 19 characters of timestamp */
if (ptr[MICROSECOND_TIMESTAMP_BUFFER_SIZE-1] != '\n')
{
my_error(ER_FPARSER_ERROR_IN_PARAMETER, MYF(0),
parameter->name.str, line);
DBUG_RETURN(TRUE);
}
memcpy(val->str, ptr, MICROSECOND_TIMESTAMP_BUFFER_SIZE-1);
val->str[val->length= MICROSECOND_TIMESTAMP_BUFFER_SIZE-1]= '\0';
ptr+= MICROSECOND_TIMESTAMP_BUFFER_SIZE;
break;
}
case FILE_OPTIONS_STRLIST:
{
list= (List<LEX_STRING>*)(base + parameter->offset);
list->empty();
// list parsing
while (ptr < end)
{
if (!(str= (LEX_STRING*)alloc_root(mem_root,
sizeof(LEX_STRING))) ||
list->push_back(str, mem_root))
goto list_err;
if (!(ptr= parse_quoted_escaped_string(ptr, end, mem_root, str)))
goto list_err_w_message;
switch (*ptr) {
case '\n':
goto end_of_list;
case ' ':
// we cant go over buffer bounds, because we have \0 at the end
ptr++;
break;
default:
goto list_err_w_message;
}
}
end_of_list:
if (*(ptr++) != '\n')
goto list_err;
break;
list_err_w_message:
my_error(ER_FPARSER_ERROR_IN_PARAMETER, MYF(0),
parameter->name.str, line);
list_err:
DBUG_RETURN(TRUE);
}
case FILE_OPTIONS_ULLLIST:
if (get_file_options_ulllist(ptr, end, line, base,
parameter, mem_root))
DBUG_RETURN(TRUE);
break;
default:
DBUG_ASSERT(0); // never should happened
}
}
else
{
ptr= line;
if (hook->process_unknown_string(ptr, base, mem_root, end))
{
DBUG_RETURN(TRUE);
}
// skip unknown parameter
if (!(ptr= strchr(ptr, '\n')))
{
my_error(ER_FPARSER_EOF_IN_UNKNOWN_PARAMETER, MYF(0), line);
DBUG_RETURN(TRUE);
}
ptr++;
}
}
}
/*
NOTE: if we read less than "required" parameters, it is still Ok.
Probably, we've just read the file of the previous version, which
contains less parameters.
*/
DBUG_RETURN(FALSE);
}
/**
Dummy unknown key hook.
@param[in,out] unknown_key reference on the line with unknown
parameter and the parsing point
@param[in] base base address for parameter writing
(structure like TABLE)
@param[in] mem_root MEM_ROOT for parameters allocation
@param[in] end the end of the configuration
@note
This hook used to catch no longer supported keys and process them for
backward compatibility, but it will not slow down processing of modern
format files.
This hook does nothing except debug output.
@retval
FALSE OK
@retval
TRUE Error
*/
bool
File_parser_dummy_hook::process_unknown_string(const char *&unknown_key,
uchar* base, MEM_ROOT *mem_root,
const char *end)
{
DBUG_ENTER("file_parser_dummy_hook::process_unknown_string");
DBUG_PRINT("info", ("Unknown key: '%60s'", unknown_key));
DBUG_RETURN(FALSE);
}
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