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430d60d1fc
The problem happened because the the new client capability flag CLIENT_EXTENDED_METADATA was not put into the cache entry key. So results cached by a new client were sent to the old client (and vica versa) with a mis-matching metadata, which made the client abort the connection on an unexpected result set metadata packet format. The problem was caused by the patch for: MDEV-17832 Protocol: extensions for Pluggable types and JSON, GEOMETRY which forgot to adjust the query cache code. Fix: - Adding a new member Query_cache_query_flags::client_extended_metadata, so only clients with equal CLIENT_EXTENDED_METADATA flag values can reuse results. - Adding a new column CLIENT_EXTENDED_METADATA into INFORMATION_SCHEMA.QUERY_CACHE_INFO (privided by the qc_info plugin).
59 lines
3.8 KiB
Text
59 lines
3.8 KiB
Text
set @save_query_cache_size=@@global.query_cache_size;
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set global query_cache_type=ON;
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set local query_cache_type=ON;
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set global query_cache_size=1355776;
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create table t1 (a int not null);
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insert into t1 values (1),(2),(3);
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select * from t1;
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a
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1
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2
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3
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select statement_schema, statement_text, result_blocks_count, result_blocks_size from information_schema.query_cache_info;
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statement_schema statement_text result_blocks_count result_blocks_size
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test select * from t1 1 512
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select @@time_zone into @time_zone;
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select @@default_week_format into @default_week_format;
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select @@character_set_client into @character_set_client;
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select @@character_set_results into @character_set_results;
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select @@sql_mode into @sql_mode;
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select @@div_precision_increment into @div_precision_increment;
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select @@lc_time_names into @lc_time_names;
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select @@max_sort_length into @max_sort_length;
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select @@autocommit into @autocommit;
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select @@group_concat_max_len into @group_concat_max_len;
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select Name into @new_time_zone from mysql.time_zone_name limit 1;
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set time_zone=@new_time_zone,default_week_format=4,character_set_client='binary',character_set_results='utf32',collation_connection='utf32_bin',sql_mode='STRICT_ALL_TABLES',div_precision_increment=7,lc_time_names='ar_SD',autocommit=0, group_concat_max_len=513, max_sort_length=1011;
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select * from t1;
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set time_zone= @time_zone, default_week_format= @default_week_format, character_set_client= @character_set_client,character_set_results= @character_set_results, sql_mode= @sql_mode, div_precision_increment= @div_precision_increment, lc_time_names= @lc_time_names, autocommit= @autocommit, group_concat_max_len= @group_concat_max_len, max_sort_length= @max_sort_length;
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select * from information_schema.query_cache_info;
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STATEMENT_SCHEMA STATEMENT_TEXT RESULT_BLOCKS_COUNT RESULT_BLOCKS_SIZE RESULT_BLOCKS_SIZE_USED LIMIT MAX_SORT_LENGTH GROUP_CONCAT_MAX_LENGTH CHARACTER_SET_CLIENT CHARACTER_SET_RESULT COLLATION TIMEZONE DEFAULT_WEEK_FORMAT DIV_PRECISION_INCREMENT SQL_MODE LC_TIME_NAMES CLIENT_LONG_FLAG CLIENT_PROTOCOL_41 CLIENT_EXTENDED_METADATA PROTOCOL_TYPE MORE_RESULTS_EXISTS IN_TRANS AUTOCOMMIT PACKET_NUMBER HITS
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test select * from t1 1 512 # -1 1011 513 binary utf32 utf32_bin Europe/Moscow 4 7 STRICT_ALL_TABLES ar_SD 1 1 1 # 0 0 0 # 0
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test select * from t1 1 512 # -1 1024 1048576 latin1 latin1 latin1_swedish_ci SYSTEM 0 4 STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION en_US 1 1 1 # 0 0 1 # 0
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reset query cache;
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select * from t1;
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a
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1
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2
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3
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select * from t1;
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a
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1
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2
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3
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select hits, statement_text from information_schema.query_cache_info;
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hits statement_text
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1 select * from t1
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drop table t1;
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select statement_schema, statement_text, result_blocks_count, result_blocks_size from information_schema.query_cache_info;
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statement_schema statement_text result_blocks_count result_blocks_size
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set global query_cache_size = 0;
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select * from information_schema.query_cache_info;
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STATEMENT_SCHEMA STATEMENT_TEXT RESULT_BLOCKS_COUNT RESULT_BLOCKS_SIZE RESULT_BLOCKS_SIZE_USED LIMIT MAX_SORT_LENGTH GROUP_CONCAT_MAX_LENGTH CHARACTER_SET_CLIENT CHARACTER_SET_RESULT COLLATION TIMEZONE DEFAULT_WEEK_FORMAT DIV_PRECISION_INCREMENT SQL_MODE LC_TIME_NAMES CLIENT_LONG_FLAG CLIENT_PROTOCOL_41 CLIENT_EXTENDED_METADATA PROTOCOL_TYPE MORE_RESULTS_EXISTS IN_TRANS AUTOCOMMIT PACKET_NUMBER HITS
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set global query_cache_size= default;
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set global query_cache_type=default;
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show query_cache_info;
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ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'query_cache_info' at line 1
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flush query_cache_info;
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ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'query_cache_info' at line 1
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set @@global.query_cache_size=@save_query_cache_size;
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