diff options
author | unknown <bell@sanja.is.com.ua> | 2005-06-23 20:06:35 +0300 |
---|---|---|
committer | unknown <bell@sanja.is.com.ua> | 2005-06-23 20:06:35 +0300 |
commit | 0cc6dd83c469b105c6c4e9032d28b01dd208c532 (patch) | |
tree | 0d99be579b042cf0600548c9e9e8b0e29fc7ba11 | |
parent | 109323717470d3d7c2507b0e424a340eb05a0679 (diff) | |
download | mariadb-git-0cc6dd83c469b105c6c4e9032d28b01dd208c532.tar.gz |
temporary tables of subquery in the from clause just skipped during processing QC tables (BUG#11522)
mysql-test/r/query_cache.result:
queries with subquery in the FROM clause
mysql-test/t/query_cache.test:
queries with subquery in the FROM clause
sql/sql_cache.cc:
temporary tables of subquery in the from clause just skipped during processing QC tables
-rw-r--r-- | mysql-test/r/query_cache.result | 52 | ||||
-rw-r--r-- | mysql-test/t/query_cache.test | 26 | ||||
-rw-r--r-- | sql/sql_cache.cc | 17 |
3 files changed, 93 insertions, 2 deletions
diff --git a/mysql-test/r/query_cache.result b/mysql-test/r/query_cache.result index 55f9bc6c224..ec996fb4128 100644 --- a/mysql-test/r/query_cache.result +++ b/mysql-test/r/query_cache.result @@ -971,4 +971,56 @@ abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzab 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flush query cache; drop table t1, t2; +create table t1 (a int); +insert into t1 values (1); +reset query cache; +flush status; +select * from (select * from t1) a; +a +1 +show status like "Qcache_queries_in_cache"; +Variable_name Value +Qcache_queries_in_cache 1 +show status like "Qcache_inserts"; +Variable_name Value +Qcache_inserts 1 +show status like "Qcache_hits"; +Variable_name Value +Qcache_hits 0 +select * from (select * from t1) a; +a +1 +show status like "Qcache_queries_in_cache"; +Variable_name Value +Qcache_queries_in_cache 1 +show status like "Qcache_inserts"; +Variable_name Value +Qcache_inserts 1 +show status like "Qcache_hits"; +Variable_name Value +Qcache_hits 1 +insert into t1 values (2); +show status like "Qcache_queries_in_cache"; +Variable_name Value +Qcache_queries_in_cache 0 +show status like "Qcache_inserts"; +Variable_name Value +Qcache_inserts 1 +show status like "Qcache_hits"; +Variable_name Value +Qcache_hits 1 +select * from (select * from t1) a; +a +1 +2 +show status like "Qcache_queries_in_cache"; +Variable_name Value +Qcache_queries_in_cache 1 +show status like "Qcache_inserts"; +Variable_name Value +Qcache_inserts 2 +show status like "Qcache_hits"; +Variable_name Value +Qcache_hits 1 +drop table t1; set GLOBAL query_cache_size=0; diff --git a/mysql-test/t/query_cache.test b/mysql-test/t/query_cache.test index 170f150f7aa..ecb8fee9af1 100644 --- a/mysql-test/t/query_cache.test +++ b/mysql-test/t/query_cache.test @@ -730,4 +730,30 @@ flush query cache; drop table t1, t2; +create table t1 (a int); +insert into t1 values (1); +reset query cache; +flush status; + +# +# queries with subquery in the FROM clause (BUG#11522) +# +select * from (select * from t1) a; +show status like "Qcache_queries_in_cache"; +show status like "Qcache_inserts"; +show status like "Qcache_hits"; +select * from (select * from t1) a; +show status like "Qcache_queries_in_cache"; +show status like "Qcache_inserts"; +show status like "Qcache_hits"; +insert into t1 values (2); +show status like "Qcache_queries_in_cache"; +show status like "Qcache_inserts"; +show status like "Qcache_hits"; +select * from (select * from t1) a; +show status like "Qcache_queries_in_cache"; +show status like "Qcache_inserts"; +show status like "Qcache_hits"; +drop table t1; + set GLOBAL query_cache_size=0; diff --git a/sql/sql_cache.cc b/sql/sql_cache.cc index 8deb3489782..366a13d59ba 100644 --- a/sql/sql_cache.cc +++ b/sql/sql_cache.cc @@ -2114,6 +2114,13 @@ my_bool Query_cache::register_all_tables(Query_cache_block *block, for (n=0; tables_used; tables_used=tables_used->next, n++, block_table++) { + if (tables_used->derived) + { + DBUG_PRINT("qcache", ("derived table skipped")); + n--; + block_table--; + continue; + } DBUG_PRINT("qcache", ("table %s, db %s, openinfo at 0x%lx, keylen %u, key at 0x%lx", tables_used->real_name, tables_used->db, @@ -2671,7 +2678,8 @@ TABLE_COUNTER_TYPE Query_cache::is_cacheable(THD *thd, uint32 query_len, table_alias_charset used here because it depends of lower_case_table_names variable */ - if (tables_used->table->tmp_table != NO_TMP_TABLE || + if ((tables_used->table->tmp_table != NO_TMP_TABLE && + !tables_used->derived) || (*tables_type & HA_CACHE_TBL_NOCACHE) || (tables_used->db_length == 5 && my_strnncoll(table_alias_charset, (uchar*)tables_used->db, 6, @@ -2682,7 +2690,12 @@ TABLE_COUNTER_TYPE Query_cache::is_cacheable(THD *thd, uint32 query_len, other non-cacheable table(s)")); DBUG_RETURN(0); } - if (tables_used->table->db_type == DB_TYPE_MRG_MYISAM) + if (tables_used->derived) + { + table_count--; + DBUG_PRINT("qcache", ("derived table skipped")); + } + else if (tables_used->table->db_type == DB_TYPE_MRG_MYISAM) { ha_myisammrg *handler = (ha_myisammrg *)tables_used->table->file; MYRG_INFO *file = handler->myrg_info(); |