Commit 0cc6dd83 authored by unknown's avatar unknown
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temporary tables of subquery in the from clause just skipped during processing... 

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
parent 10932371

mysql-test/r/query_cache.result

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Original line number Diff line number Diff line
@@ -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;

mysql-test/t/query_cache.test

+26 −0
Original line number Diff line number Diff line
@@ -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;

sql/sql_cache.cc

+15 −2
Original line number Diff line number Diff line
@@ -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();