bk commit into 4.1 tree (bell:1.2314) BUG#11522

[sanja]

Below is the list of changes that have just been committed into a local
4.1 repository of bell. When bell does a push these changes will
be propagated to the main repository and, within 24 hours after the
push, to the public repository.
For information on how to access the public repository
see http://dev.mysql.com/doc/mysql/en/installing-source-tree.html

ChangeSet
  1.2314 05/06/23 17:44:25 bell@stripped +3 -0
  temporary tables of subquery in the from clause just skipped during processing QC tables
(BUG#11522)

  sql/sql_cache.cc
    1.92 05/06/23 17:43:24 bell@stripped +15 -2
    temporary tables of subquery in the from clause just skipped during processing QC
tables

  mysql-test/t/query_cache.test
    1.42 05/06/23 17:43:24 bell@stripped +26 -0
    queries with subquery in the FROM clause

  mysql-test/r/query_cache.result
    1.55 05/06/23 17:43:24 bell@stripped +52 -0
    queries with subquery in the FROM clause

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	bell
# Host:	sanja.is.com.ua
# Root:	/home/bell/mysql/bk/work-bug_qc-4.1

--- 1.91/sql/sql_cache.cc	Fri Apr  1 06:17:43 2005
+++ 1.92/sql/sql_cache.cc	Thu Jun 23 17:43:24 2005
@@ -2114,6 +2114,13 @@
 
   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_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 @@
 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();

--- 1.54/mysql-test/r/query_cache.result	Fri Apr 29 18:46:00 2005
+++ 1.55/mysql-test/r/query_cache.result	Thu Jun 23 17:43:24 2005
@@ -971,4 +971,56 @@
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 lkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcba
 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;

--- 1.41/mysql-test/t/query_cache.test	Fri Apr 29 18:46:00 2005
+++ 1.42/mysql-test/t/query_cache.test	Thu Jun 23 17:43:24 2005
@@ -730,4 +730,30 @@
 
 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;