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mariadb/plugin/qc_info/qc_info.cc
Alexander Barkov fd247cc21f MDEV-31340 Remove MY_COLLATION_HANDLER::strcasecmp() 
This patch also fixes:
  MDEV-33050 Build-in schemas like oracle_schema are accent insensitive
  MDEV-33084 LASTVAL(t1) and LASTVAL(T1) do not work well with lower-case-table-names=0
  MDEV-33085 Tables T1 and t1 do not work well with ENGINE=CSV and lower-case-table-names=0
  MDEV-33086 SHOW OPEN TABLES IN DB1 -- is case insensitive with lower-case-table-names=0
  MDEV-33088 Cannot create triggers in the database `MYSQL`
  MDEV-33103 LOCK TABLE t1 AS t2 -- alias is not case sensitive with lower-case-table-names=0
  MDEV-33109 DROP DATABASE MYSQL -- does not drop SP with lower-case-table-names=0
  MDEV-33110 HANDLER commands are case insensitive with lower-case-table-names=0
  MDEV-33119 User is case insensitive in INFORMATION_SCHEMA.VIEWS
  MDEV-33120 System log table names are case insensitive with lower-cast-table-names=0

- Removing the virtual function strnncoll() from MY_COLLATION_HANDLER

- Adding a wrapper function CHARSET_INFO::streq(), to compare
  two strings for equality. For now it calls strnncoll() internally.
  In the future it will turn into a virtual function.

- Adding new accent sensitive case insensitive collations:
    - utf8mb4_general1400_as_ci
    - utf8mb3_general1400_as_ci
  They implement accent sensitive case insensitive comparison.
  The weight of a character is equal to the code point of its
  upper case variant. These collations use Unicode-14.0.0 casefolding data.

  The result of
     my_charset_utf8mb3_general1400_as_ci.strcoll()
  is very close to the former
     my_charset_utf8mb3_general_ci.strcasecmp()

  There is only a difference in a couple dozen rare characters, because:
    - the switch from "tolower" to "toupper" comparison, to make
      utf8mb3_general1400_as_ci closer to utf8mb3_general_ci
    - the switch from Unicode-3.0.0 to Unicode-14.0.0
  This difference should be tolarable. See the list of affected
  characters in the MDEV description.

  Note, utf8mb4_general1400_as_ci correctly handles non-BMP characters!
  Unlike utf8mb4_general_ci, it does not treat all BMP characters
  as equal.

- Adding classes representing names of the file based database objects:

    Lex_ident_db
    Lex_ident_table
    Lex_ident_trigger

  Their comparison collation depends on the underlying
  file system case sensitivity and on --lower-case-table-names
  and can be either my_charset_bin or my_charset_utf8mb3_general1400_as_ci.

- Adding classes representing names of other database objects,
  whose names have case insensitive comparison style,
  using my_charset_utf8mb3_general1400_as_ci:

  Lex_ident_column
  Lex_ident_sys_var
  Lex_ident_user_var
  Lex_ident_sp_var
  Lex_ident_ps
  Lex_ident_i_s_table
  Lex_ident_window
  Lex_ident_func
  Lex_ident_partition
  Lex_ident_with_element
  Lex_ident_rpl_filter
  Lex_ident_master_info
  Lex_ident_host
  Lex_ident_locale
  Lex_ident_plugin
  Lex_ident_engine
  Lex_ident_server
  Lex_ident_savepoint
  Lex_ident_charset
  engine_option_value::Name

- All the mentioned Lex_ident_xxx classes implement a method streq():

  if (ident1.streq(ident2))
     do_equal();

  This method works as a wrapper for CHARSET_INFO::streq().

- Changing a lot of "LEX_CSTRING name" to "Lex_ident_xxx name"
  in class members and in function/method parameters.

- Replacing all calls like
    system_charset_info->coll->strcasecmp(ident1, ident2)
  to
    ident1.streq(ident2)

- Taking advantage of the c++11 user defined literal operator
  for LEX_CSTRING (see m_strings.h) and Lex_ident_xxx (see lex_ident.h)
  data types. Use example:

  const Lex_ident_column primary_key_name= "PRIMARY"_Lex_ident_column;

  is now a shorter version of:

  const Lex_ident_column primary_key_name=
    Lex_ident_column({STRING_WITH_LEN("PRIMARY")});
2024-04-18 15:22:10 +04:00

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/*
Copyright (c) 2008, Roland Bouman
http://rpbouman.blogspot.com/
roland.bouman@gmail.com
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of the Roland Bouman nor the
names of the contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef MYSQL_SERVER
#define MYSQL_SERVER
#endif
#include <my_global.h>
#include <sql_parse.h> // check_global_access
#include <sql_acl.h> // PROCESS_ACL
#include <sql_class.h> // THD
#include <sql_cache.h>
#include <sql_i_s.h> // ST_SCHEMA_TABLE
#include <set_var.h> // sql_mode_string_representation
#include <tztime.h>
#include <mysql/plugin.h>
class Accessible_Query_Cache : public Query_cache {
public:
HASH *get_queries()
{
return &this->queries;
}
} *qc;
bool schema_table_store_record(THD *thd, TABLE *table);
#define MAX_STATEMENT_TEXT_LENGTH 32767
#define COLUMN_STATEMENT_SCHEMA 0
#define COLUMN_STATEMENT_TEXT 1
#define COLUMN_RESULT_BLOCKS_COUNT 2
#define COLUMN_RESULT_BLOCKS_SIZE 3
#define COLUMN_RESULT_BLOCKS_SIZE_USED 4
#define COLUMN_LIMIT 5
#define COLUMN_MAX_SORT_LENGTH 6
#define COLUMN_GROUP_CONCAT_MAX_LENGTH 7
#define COLUMN_CHARACTER_SET_CLIENT 8
#define COLUMN_CHARACTER_SET_RESULT 9
#define COLUMN_COLLATION 10
#define COLUMN_TIMEZONE 11
#define COLUMN_DEFAULT_WEEK_FORMAT 12
#define COLUMN_DIV_PRECISION_INCREMENT 13
#define COLUMN_SQL_MODE 14
#define COLUMN_LC_TIME_NAMES 15
#define COLUMN_CLIENT_LONG_FLAG 16
#define COLUMN_CLIENT_PROTOCOL_41 17
#define COLUMN_CLIENT_EXTENDED_METADATA 18
#define COLUMN_PROTOCOL_TYPE 19
#define COLUMN_MORE_RESULTS_EXISTS 20
#define COLUMN_IN_TRANS 21
#define COLUMN_AUTOCOMMIT 22
#define COLUMN_PKT_NR 23
#define COLUMN_HITS 24
namespace Show {
/* ST_FIELD_INFO is defined in table.h */
static ST_FIELD_INFO qc_info_fields[]=
{
Column("STATEMENT_SCHEMA", Varchar(NAME_LEN), NOT_NULL),
Column("STATEMENT_TEXT", Longtext(MAX_STATEMENT_TEXT_LENGTH),NOT_NULL),
Column("RESULT_BLOCKS_COUNT", SLong(), NOT_NULL),
Column("RESULT_BLOCKS_SIZE", SLonglong(MY_INT32_NUM_DECIMAL_DIGITS),NOT_NULL),
Column("RESULT_BLOCKS_SIZE_USED",SLonglong(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
Column("LIMIT", SLonglong(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
Column("MAX_SORT_LENGTH", SLonglong(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
Column("GROUP_CONCAT_MAX_LENGTH",SLonglong(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
Column("CHARACTER_SET_CLIENT", CSName(), NOT_NULL),
Column("CHARACTER_SET_RESULT", CSName(), NOT_NULL),
Column("COLLATION", CLName(), NOT_NULL),
Column("TIMEZONE", Varchar(50), NOT_NULL),
Column("DEFAULT_WEEK_FORMAT", SLong(), NOT_NULL),
Column("DIV_PRECISION_INCREMENT",SLong(), NOT_NULL),
Column("SQL_MODE", Varchar(250), NOT_NULL),
Column("LC_TIME_NAMES", Varchar(100), NOT_NULL),
Column("CLIENT_LONG_FLAG", STiny(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
Column("CLIENT_PROTOCOL_41", STiny(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
Column("CLIENT_EXTENDED_METADATA",STiny(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
Column("PROTOCOL_TYPE", STiny(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
Column("MORE_RESULTS_EXISTS", STiny(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
Column("IN_TRANS", STiny(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
Column("AUTOCOMMIT", STiny(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
Column("PACKET_NUMBER", STiny(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
Column("HITS", SLonglong(MY_INT32_NUM_DECIMAL_DIGITS), NOT_NULL),
CEnd()
};
} // namespace Show
static const char unknown[]= "#UNKNOWN#";
static int qc_info_fill_table(THD *thd, TABLE_LIST *tables,
COND *cond)
{
int status= 1;
CHARSET_INFO *scs= system_charset_info;
TABLE *table= tables->table;
HASH *queries = qc->get_queries();
/* one must have PROCESS privilege to see others' queries */
if (check_global_access(thd, PROCESS_ACL, true))
return 0;
if (qc->try_lock(thd))
return 0; // QC is or is being disabled
/* loop through all queries in the query cache */
for (uint i= 0; i < queries->records; i++)
{
const uchar *query_cache_block_raw;
Query_cache_block* query_cache_block;
Query_cache_query* query_cache_query;
Query_cache_query_flags flags;
uint result_blocks_count;
ulonglong result_blocks_size;
ulonglong result_blocks_size_used;
Query_cache_block *first_result_block;
Query_cache_block *result_block;
const char *statement_text;
size_t statement_text_length;
size_t flags_length;
const char *key, *db;
size_t key_length, db_length;
LEX_CSTRING sql_mode_str;
const String *tz;
CHARSET_INFO *cs_client;
CHARSET_INFO *cs_result;
CHARSET_INFO *collation;
query_cache_block_raw = my_hash_element(queries, i);
query_cache_block = (Query_cache_block*)query_cache_block_raw;
if (unlikely(!query_cache_block ||
query_cache_block->type != Query_cache_block::QUERY))
continue;
query_cache_query = query_cache_block->query();
/* Get the actual SQL statement for this query cache query */
statement_text = (const char*)query_cache_query->query();
statement_text_length = strlen(statement_text);
/* We truncate SQL statements up to MAX_STATEMENT_TEXT_LENGTH in our I_S table */
table->field[COLUMN_STATEMENT_TEXT]->store((char*)statement_text,
MY_MIN(statement_text_length, MAX_STATEMENT_TEXT_LENGTH), scs);
/* get the entire key that identifies this query cache query */
key = (const char*)query_cache_query_get_key(query_cache_block_raw,
&key_length, 0);
/* get and store the flags */
flags_length= key_length - QUERY_CACHE_FLAGS_SIZE;
memcpy(&flags, key+flags_length, QUERY_CACHE_FLAGS_SIZE);
table->field[COLUMN_LIMIT]->store(flags.limit, 0);
table->field[COLUMN_MAX_SORT_LENGTH]->store(flags.max_sort_length, 0);
table->field[COLUMN_GROUP_CONCAT_MAX_LENGTH]->store(flags.group_concat_max_len, 0);
cs_client= get_charset(flags.character_set_client_num, MYF(MY_WME));
if (likely(cs_client))
table->field[COLUMN_CHARACTER_SET_CLIENT]->
store(&cs_client->cs_name, scs);
else
table->field[COLUMN_CHARACTER_SET_CLIENT]->
store(STRING_WITH_LEN(unknown), scs);
cs_result= get_charset(flags.character_set_results_num, MYF(MY_WME));
if (likely(cs_result))
table->field[COLUMN_CHARACTER_SET_RESULT]->store(&cs_result->cs_name, scs);
else
table->field[COLUMN_CHARACTER_SET_RESULT]->
store(STRING_WITH_LEN(unknown), scs);
collation= get_charset(flags.collation_connection_num, MYF(MY_WME));
if (likely(collation))
table->field[COLUMN_COLLATION]-> store(&collation->coll_name, scs);
else
table->field[COLUMN_COLLATION]-> store(STRING_WITH_LEN(unknown), scs);
tz= flags.time_zone->get_name();
if (likely(tz))
table->field[COLUMN_TIMEZONE]->store(tz->ptr(), tz->length(), scs);
else
table->field[COLUMN_TIMEZONE]-> store(STRING_WITH_LEN(unknown), scs);
table->field[COLUMN_DEFAULT_WEEK_FORMAT]->store(flags.default_week_format, 0);
table->field[COLUMN_DIV_PRECISION_INCREMENT]->store(flags.div_precision_increment, 0);
sql_mode_string_representation(thd, flags.sql_mode, &sql_mode_str);
table->field[COLUMN_SQL_MODE]->store(sql_mode_str.str, sql_mode_str.length, scs);
table->field[COLUMN_LC_TIME_NAMES]->store(flags.lc_time_names->name, scs);
table->field[COLUMN_CLIENT_LONG_FLAG]->store(flags.client_long_flag, 0);
table->field[COLUMN_CLIENT_PROTOCOL_41]->store(flags.client_protocol_41, 0);
table->field[COLUMN_CLIENT_EXTENDED_METADATA]->
store(flags.client_extended_metadata, 0);
table->field[COLUMN_PROTOCOL_TYPE]->store(flags.protocol_type, 0);
table->field[COLUMN_MORE_RESULTS_EXISTS]->store(flags.more_results_exists, 0);
table->field[COLUMN_IN_TRANS]->store(flags.in_trans, 0);
table->field[COLUMN_AUTOCOMMIT]->store(flags.autocommit, 0);
table->field[COLUMN_PKT_NR]->store(flags.pkt_nr, 0);
table->field[COLUMN_HITS]->store(query_cache_query->hits(), 0);
/* The database against which the statement is executed is part of the
query cache query key
*/
compile_time_assert(QUERY_CACHE_DB_LENGTH_SIZE == 2);
db= key + statement_text_length + 1 + QUERY_CACHE_DB_LENGTH_SIZE;
db_length= uint2korr(db - QUERY_CACHE_DB_LENGTH_SIZE);
table->field[COLUMN_STATEMENT_SCHEMA]->store(db, db_length, scs);
/* If we have result blocks, process them */
first_result_block= query_cache_query->result();
if(query_cache_query->is_results_ready() &&
first_result_block)
{
/* initialize so we can loop over the result blocks*/
result_block= first_result_block;
result_blocks_count = 1;
result_blocks_size = result_block->length;
result_blocks_size_used = result_block->used;
/* loop over the result blocks*/
while((result_block= result_block->next)!=first_result_block)
{
/* calculate total number of result blocks */
result_blocks_count++;
/* calculate total size of result blocks */
result_blocks_size += result_block->length;
/* calculate total of used size of result blocks */
result_blocks_size_used += result_block->used;
}
}
else
{
result_blocks_count = 0;
result_blocks_size = 0;
result_blocks_size_used = 0;
}
table->field[COLUMN_RESULT_BLOCKS_COUNT]->store(result_blocks_count, 0);
table->field[COLUMN_RESULT_BLOCKS_SIZE]->store(result_blocks_size, 0);
table->field[COLUMN_RESULT_BLOCKS_SIZE_USED]->
store(result_blocks_size_used, 0);
if (schema_table_store_record(thd, table))
goto cleanup;
}
status = 0;
cleanup:
qc->unlock();
return status;
}
static int qc_info_plugin_init(void *p)
{
ST_SCHEMA_TABLE *schema= (ST_SCHEMA_TABLE *)p;
schema->fields_info= Show::qc_info_fields;
schema->fill_table= qc_info_fill_table;
qc = (Accessible_Query_Cache *)&query_cache;
return qc == 0;
}
static struct st_mysql_information_schema qc_info_plugin=
{ MYSQL_INFORMATION_SCHEMA_INTERFACE_VERSION };
/*
Plugin library descriptor
*/
maria_declare_plugin(query_cache_info)
{
MYSQL_INFORMATION_SCHEMA_PLUGIN,
&qc_info_plugin,
"QUERY_CACHE_INFO",
"Roland Bouman, Daniel Black",
"Lists all queries in the query cache.",
PLUGIN_LICENSE_BSD,
qc_info_plugin_init, /* Plugin Init */
0, /* Plugin Deinit */
0x0101, /* version, hex */
NULL, /* status variables */
NULL, /* system variables */
"1.1", /* version as a string */
MariaDB_PLUGIN_MATURITY_STABLE
}
maria_declare_plugin_end;
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