BUG#4286 - HANDLER tables are closed by FLUSH TABLE(S).

BUG#4335 - one name can be handler open'ed many times.
Reworked the HANDLER functions and interface.
Using a HASH to store information on open tables that
survives FLUSH TABLE.
HANDLER tables alias names must now be unique, though it
is allowed in 4.0 to qualify them with the database name
of the base table.


mysql-test/r/flush_table.result:
  BUG#4286 - HANDLER tables are closed by FLUSH TABLE(S).
  BUG#4335 - one name can be handler open'ed many times.
  Moved pure handler test results to handler.result.
  Added the new test results.
mysql-test/r/handler.result:
  BUG#4286 - HANDLER tables are closed by FLUSH TABLE(S).
  BUG#4335 - one name can be handler open'ed many times.
  Moved pure handler test results from flush_table.result to here.
mysql-test/t/flush_table.test:
  BUG#4286 - HANDLER tables are closed by FLUSH TABLE(S).
  BUG#4335 - one name can be handler open'ed many times.
  Moved pure handler tests to handler.test.
  Added new tests.
mysql-test/t/handler.test:
  BUG#4286 - HANDLER tables are closed by FLUSH TABLE(S).
  BUG#4335 - one name can be handler open'ed many times.
  Moved pure handler tests from flush_table.test to here.
sql/mysql_priv.h:
  BUG#4286 - HANDLER tables are closed by FLUSH TABLE(S).
  BUG#4335 - one name can be handler open'ed many times.
  Reworked the handler interface.
sql/sql_base.cc:
  BUG#4286 - HANDLER tables are closed by FLUSH TABLE(S).
  BUG#4335 - one name can be handler open'ed many times.
  Replaced mysql_ha_close_list() by the better named
  function mysql_ha_flush() with readable options.
sql/sql_class.cc:
  BUG#4286 - HANDLER tables are closed by FLUSH TABLE(S).
  BUG#4335 - one name can be handler open'ed many times.
  Added initialization for the handler tables hash.
  Changed the handler tables clean-up code.
  Unreleted to bug: Changed the order of THD initialization
  to avoid warning messages on Linux with gcc.
sql/sql_class.h:
  BUG#4286 - HANDLER tables are closed by FLUSH TABLE(S).
  BUG#4335 - one name can be handler open'ed many times.
  Added the handler tables HASH to THD.
sql/sql_handler.cc:
  BUG#4286 - HANDLER tables are closed by FLUSH TABLE(S).
  BUG#4335 - one name can be handler open'ed many times.
  Completely reworked the handler functions.
  Added an introducing comment, describing the new functionality.
sql/sql_table.cc:
  BUG#4286 - HANDLER tables are closed by FLUSH TABLE(S).
  BUG#4335 - one name can be handler open'ed many times.
  replaced mysql_ha_close() by the better named
  function mysql_ha_flush() with readable options.

4 files changed, 514 insertions, 119 deletions

diff --git a/mysql-test/r/flush_table.result b/mysql-test/r/flush_table.result
index cfba428e2e8..ff69291193f 100644
--- a/mysql-test/r/flush_table.result
+++ b/mysql-test/r/flush_table.result
@@ -7,58 +7,6 @@ check table t1;
 Table	Op	Msg_type	Msg_text
 test.t1	check	status	OK
 drop table t1;
-drop database if exists test_test;
-create database test_test;
-use test_test;
-create table t1(table_id char(20) primary key);
-insert into t1 values ('test_test.t1');
-insert into t1 values ('');
-handler t1 open;
-handler t1 read first limit 9;
-table_id
-test_test.t1
-
-create table t2(table_id char(20) primary key);
-insert into t2 values ('test_test.t2');
-insert into t2 values ('');
-handler t2 open;
-handler t2 read first limit 9;
-table_id
-test_test.t2
-
-use test;
-drop table if exists t1;
-create table t1(table_id char(20) primary key);
-insert into t1 values ('test.t1');
-insert into t1 values ('');
-handler t1 open;
-handler t1 read first limit 9;
-table_id
-test.t1
-
-use test;
-handler test.t1 read first limit 9;
-table_id
-test.t1
-
-handler test.t2 read first limit 9;
-Unknown table 't2' in HANDLER
-handler test_test.t1 read first limit 9;
-table_id
-test_test.t1
-
-handler test_test.t2 read first limit 9;
-table_id
-test_test.t2
-
-handler test_test.t1 close;
-drop table test_test.t1;
-handler test_test.t2 close;
-drop table test_test.t2;
-drop database test_test;
-use test;
-handler test.t1 close;
-drop table test.t1;
 drop table if exists t1;
 drop table if exists t2;
 create table t1(table_id char(20) primary key);
@@ -84,14 +32,23 @@ test.t2
 
 flush tables;
 handler a1 read first limit 9;
-Unknown table 'a1' in HANDLER
+table_id
+test.t1
+
 handler a2 read first limit 9;
-Unknown table 'a2' in HANDLER
+table_id
+test.t1
+
 handler t2 read first limit 9;
-Unknown table 't2' in HANDLER
+table_id
+test.t2
+
 handler t1 open as a1;
+Not unique table/alias: 'a1'
 handler t1 open as a2;
+Not unique table/alias: 'a2'
 handler t2 open;
+Not unique table/alias: 't2'
 handler a1 read first limit 9;
 table_id
 test.t1
@@ -106,15 +63,43 @@ test.t2
 
 flush table t1;
 handler a1 read first limit 9;
-Unknown table 'a1' in HANDLER
+table_id
+test.t1
+
 handler a2 read first limit 9;
-Unknown table 'a2' in HANDLER
+table_id
+test.t1
+
 handler t2 read first limit 9;
 table_id
 test.t2
 
 flush table t2;
 handler t2 close;
-Unknown table 't2' in HANDLER
 drop table t1;
 drop table t2;
+create table t1(table_id char(20) primary key);
+insert into t1 values ('Record-01');
+insert into t1 values ('Record-02');
+insert into t1 values ('Record-03');
+insert into t1 values ('Record-04');
+insert into t1 values ('Record-05');
+handler t1 open;
+handler t1 read first limit 1;
+table_id
+Record-01
+handler t1 read next limit 1;
+table_id
+Record-02
+handler t1 read next limit 1;
+table_id
+Record-03
+flush table t1;
+handler t1 read next limit 1;
+table_id
+Record-01
+handler t1 read next limit 1;
+table_id
+Record-02
+handler t1 close;
+drop table t1;
diff --git a/mysql-test/r/handler.result b/mysql-test/r/handler.result
index 50d51cf14f4..5af153930d5 100644
--- a/mysql-test/r/handler.result
+++ b/mysql-test/r/handler.result
@@ -203,3 +203,247 @@ handler t1 read a=(1) where b=1;
 a	b
 handler t1 close;
 drop table t1;
+drop database if exists test_test;
+create database test_test;
+use test_test;
+create table t1(table_id char(20) primary key);
+insert into t1 values ('test_test.t1');
+insert into t1 values ('');
+handler t1 open;
+handler t1 read first limit 9;
+table_id
+test_test.t1
+
+create table t2(table_id char(20) primary key);
+insert into t2 values ('test_test.t2');
+insert into t2 values ('');
+handler t2 open;
+handler t2 read first limit 9;
+table_id
+test_test.t2
+
+use test;
+drop table if exists t1;
+create table t1(table_id char(20) primary key);
+insert into t1 values ('test.t1');
+insert into t1 values ('');
+handler t1 open;
+Not unique table/alias: 't1'
+use test;
+handler test.t1 read first limit 9;
+Unknown table 'test.t1' in HANDLER
+handler test_test.t1 read first limit 9;
+table_id
+test_test.t1
+
+handler t1 read first limit 9;
+table_id
+test_test.t1
+
+handler test_test.t2 read first limit 9;
+table_id
+test_test.t2
+
+handler t2 read first limit 9;
+table_id
+test_test.t2
+
+handler test_test.t1 close;
+handler t1 close;
+Unknown table 't1' in HANDLER
+drop table test_test.t1;
+handler test_test.t2 close;
+handler t2 close;
+Unknown table 't2' in HANDLER
+drop table test_test.t2;
+drop database test_test;
+use test;
+handler test.t1 close;
+Unknown table 'test.t1' in HANDLER
+handler t1 close;
+Unknown table 't1' in HANDLER
+drop table test.t1;
+drop database if exists test_test;
+drop table if exists t1;
+drop table if exists t2;
+drop table if exists t3;
+create database test_test;
+use test_test;
+create table t1 (c1 char(20));
+insert into t1 values ('test_test.t1');
+create table t3 (c1 char(20));
+insert into t3 values ('test_test.t3');
+handler t1 open;
+handler t1 read first limit 9;
+c1
+test_test.t1
+handler t1 open h1;
+handler h1 read first limit 9;
+c1
+test_test.t1
+use test;
+create table t1 (c1 char(20));
+create table t2 (c1 char(20));
+create table t3 (c1 char(20));
+insert into t1 values ('t1');
+insert into t2 values ('t2');
+insert into t3 values ('t3');
+handler t1 open;
+Not unique table/alias: 't1'
+handler t2 open t1;
+Not unique table/alias: 't1'
+handler t3 open t1;
+Not unique table/alias: 't1'
+handler t1 read first limit 9;
+c1
+test_test.t1
+handler test.t1 close;
+Unknown table 'test.t1' in HANDLER
+handler test.t1 open h1;
+Not unique table/alias: 'h1'
+handler test_test.t1 open h1;
+Not unique table/alias: 'h1'
+handler test_test.t3 open h3;
+handler test.t1 open h2;
+handler t1 read first limit 9;
+c1
+test_test.t1
+handler h1 read first limit 9;
+c1
+test_test.t1
+handler h2 read first limit 9;
+c1
+t1
+handler h3 read first limit 9;
+c1
+test_test.t3
+handler test.h2 read first limit 9;
+c1
+t1
+handler test.h1 close;
+Unknown table 'test.h1' in HANDLER
+handler test_test.t1 close;
+handler test_test.h1 close;
+handler h2 close;
+handler t1 read first limit 9;
+Unknown table 't1' in HANDLER
+handler h1 read first limit 9;
+Unknown table 'h1' in HANDLER
+handler h2 read first limit 9;
+Unknown table 'h2' in HANDLER
+handler h3 read first limit 9;
+c1
+test_test.t3
+handler test_test.h3 read first limit 9;
+c1
+test_test.t3
+use test_test;
+handler h3 read first limit 9;
+c1
+test_test.t3
+handler test.h3 read first limit 9;
+Unknown table 'test.h3' in HANDLER
+handler test_test.h3 close;
+use test;
+drop table t3;
+drop table t2;
+drop table t1;
+drop database test_test;
+create table t1 (c1 char(20));
+insert into t1 values ("t1");
+handler t1 open as h1;
+handler h1 read first limit 9;
+c1
+t1
+create table t2 (c1 char(20));
+insert into t2 values ("t2");
+handler t2 open as h2;
+handler h2 read first limit 9;
+c1
+t2
+create table t3 (c1 char(20));
+insert into t3 values ("t3");
+handler t3 open as h3;
+handler h3 read first limit 9;
+c1
+t3
+create table t4 (c1 char(20));
+insert into t4 values ("t4");
+handler t4 open as h4;
+handler h4 read first limit 9;
+c1
+t4
+create table t5 (c1 char(20));
+insert into t5 values ("t5");
+handler t5 open as h5;
+handler h5 read first limit 9;
+c1
+t5
+alter table t1 engine=MyISAM;
+handler h1 read first limit 9;
+Unknown table 'h1' in HANDLER
+handler h2 read first limit 9;
+c1
+t2
+handler h3 read first limit 9;
+c1
+t3
+handler h4 read first limit 9;
+c1
+t4
+handler h5 read first limit 9;
+c1
+t5
+alter table t5 engine=MyISAM;
+handler h1 read first limit 9;
+Unknown table 'h1' in HANDLER
+handler h2 read first limit 9;
+c1
+t2
+handler h3 read first limit 9;
+c1
+t3
+handler h4 read first limit 9;
+c1
+t4
+handler h5 read first limit 9;
+Unknown table 'h5' in HANDLER
+alter table t3 engine=MyISAM;
+handler h1 read first limit 9;
+Unknown table 'h1' in HANDLER
+handler h2 read first limit 9;
+c1
+t2
+handler h3 read first limit 9;
+Unknown table 'h3' in HANDLER
+handler h4 read first limit 9;
+c1
+t4
+handler h5 read first limit 9;
+Unknown table 'h5' in HANDLER
+handler h2 close;
+handler h4 close;
+handler t1 open as h1_1;
+handler t1 open as h1_2;
+handler t1 open as h1_3;
+handler h1_1 read first limit 9;
+c1
+t1
+handler h1_2 read first limit 9;
+c1
+t1
+handler h1_3 read first limit 9;
+c1
+t1
+alter table t1 engine=MyISAM;
+handler h1_1 read first limit 9;
+Unknown table 'h1_1' in HANDLER
+handler h1_2 read first limit 9;
+Unknown table 'h1_2' in HANDLER
+handler h1_3 read first limit 9;
+Unknown table 'h1_3' in HANDLER
+drop table t1;
+drop table t2;
+drop table t3;
+drop table t4;
+drop table t5;
diff --git a/mysql-test/t/flush_table.test b/mysql-test/t/flush_table.test
index ad81f266afc..58c12bad3fa 100644
--- a/mysql-test/t/flush_table.test
+++ b/mysql-test/t/flush_table.test
@@ -13,62 +13,9 @@ check table t1;
 drop table t1;
 
 #
-# Check if two database names beginning the same are seen as different.
-#
-# This database begins like the usual 'test' database.
-#
---disable_warnings
-drop database if exists test_test;
---enable_warnings
-create database test_test;
-use test_test;
-create table t1(table_id char(20) primary key);
-insert into t1 values ('test_test.t1');
-insert into t1 values ('');
-handler t1 open;
-handler t1 read first limit 9;
-create table t2(table_id char(20) primary key);
-insert into t2 values ('test_test.t2');
-insert into t2 values ('');
-handler t2 open;
-handler t2 read first limit 9;
-#
-# This is the usual 'test' database.
-#
-use test;
---disable_warnings
-drop table if exists t1;
---enable_warnings
-create table t1(table_id char(20) primary key);
-insert into t1 values ('test.t1');
-insert into t1 values ('');
-handler t1 open;
-handler t1 read first limit 9;
-#
-# Check accesibility of all the tables.
-#
-use test;
-handler test.t1 read first limit 9;
---error 1109;
-handler test.t2 read first limit 9;
-handler test_test.t1 read first limit 9;
-handler test_test.t2 read first limit 9;
-#
-# Cleanup.
-#
-handler test_test.t1 close;
-drop table test_test.t1;
-handler test_test.t2 close;
-drop table test_test.t2;
-drop database test_test;
-#
-use test;
-handler test.t1 close;
-drop table test.t1;
-
-#
 # In the following test FLUSH TABLES produces a deadlock
-# (hang forever) if the fix for bug#3565 is missing.
+# (hang forever) if the fix for BUG #3565 is missing.
+# And it shows that handler tables are re-opened after flush (BUG #4286).
 #
 --disable_warnings
 drop table if exists t1;
@@ -87,28 +34,43 @@ handler a1 read first limit 9;
 handler a2 read first limit 9;
 handler t2 read first limit 9;
 flush tables;
---error 1109;
 handler a1 read first limit 9;
---error 1109;
 handler a2 read first limit 9;
---error 1109;
 handler t2 read first limit 9;
 #
+--error 1066
 handler t1 open as a1;
+--error 1066
 handler t1 open as a2;
+--error 1066
 handler t2 open;
 handler a1 read first limit 9;
 handler a2 read first limit 9;
 handler t2 read first limit 9;
 flush table t1;
---error 1109;
 handler a1 read first limit 9;
---error 1109;
 handler a2 read first limit 9;
 handler t2 read first limit 9;
 flush table t2;
---error 1109;
 handler t2 close;
 drop table t1;
 drop table t2;
 
+#
+# The fix for BUG #4286 cannot restore the position after a flush.
+#
+create table t1(table_id char(20) primary key);
+insert into t1 values ('Record-01');
+insert into t1 values ('Record-02');
+insert into t1 values ('Record-03');
+insert into t1 values ('Record-04');
+insert into t1 values ('Record-05');
+handler t1 open;
+handler t1 read first limit 1;
+handler t1 read next limit 1;
+handler t1 read next limit 1;
+flush table t1;
+handler t1 read next limit 1;
+handler t1 read next limit 1;
+handler t1 close;
+drop table t1;
diff --git a/mysql-test/t/handler.test b/mysql-test/t/handler.test
index 1f7f32c930a..53fe8c0a059 100644
--- a/mysql-test/t/handler.test
+++ b/mysql-test/t/handler.test
@@ -135,3 +135,207 @@ handler t1 read a=(1) where b=1;
 handler t1 close;
 drop table t1;
 
+#
+# Check if two database names beginning the same are seen as different.
+#
+# This database begins like the usual 'test' database.
+#
+--disable_warnings
+drop database if exists test_test;
+--enable_warnings
+create database test_test;
+use test_test;
+create table t1(table_id char(20) primary key);
+insert into t1 values ('test_test.t1');
+insert into t1 values ('');
+handler t1 open;
+handler t1 read first limit 9;
+create table t2(table_id char(20) primary key);
+insert into t2 values ('test_test.t2');
+insert into t2 values ('');
+handler t2 open;
+handler t2 read first limit 9;
+#
+# This is the usual 'test' database.
+#
+use test;
+--disable_warnings
+drop table if exists t1;
+--enable_warnings
+create table t1(table_id char(20) primary key);
+insert into t1 values ('test.t1');
+insert into t1 values ('');
+--error 1066
+handler t1 open;
+#
+# Check accesibility of all the tables.
+#
+use test;
+--error 1109;
+handler test.t1 read first limit 9;
+handler test_test.t1 read first limit 9;
+handler t1 read first limit 9;
+handler test_test.t2 read first limit 9;
+handler t2 read first limit 9;
+#
+# Cleanup.
+#
+
+handler test_test.t1 close;
+--error 1109;
+handler t1 close;
+drop table test_test.t1;
+handler test_test.t2 close;
+--error 1109;
+handler t2 close;
+drop table test_test.t2;
+drop database test_test;
+#
+use test;
+--error 1109;
+handler test.t1 close;
+--error 1109;
+handler t1 close;
+drop table test.t1;
+
+#
+# BUG#4335
+#
+--disable_warnings
+drop database if exists test_test;
+drop table if exists t1;
+drop table if exists t2;
+drop table if exists t3;
+--enable_warnings
+create database test_test;
+use test_test;
+create table t1 (c1 char(20));
+insert into t1 values ('test_test.t1');
+create table t3 (c1 char(20));
+insert into t3 values ('test_test.t3');
+handler t1 open;
+handler t1 read first limit 9;
+handler t1 open h1;
+handler h1 read first limit 9;
+use test;
+create table t1 (c1 char(20));
+create table t2 (c1 char(20));
+create table t3 (c1 char(20));
+insert into t1 values ('t1');
+insert into t2 values ('t2');
+insert into t3 values ('t3');
+--error 1066
+handler t1 open;
+--error 1066
+handler t2 open t1;
+--error 1066
+handler t3 open t1;
+handler t1 read first limit 9;
+--error 1109
+handler test.t1 close;
+--error 1066
+handler test.t1 open h1;
+--error 1066
+handler test_test.t1 open h1;
+handler test_test.t3 open h3;
+handler test.t1 open h2;
+handler t1 read first limit 9;
+handler h1 read first limit 9;
+handler h2 read first limit 9;
+handler h3 read first limit 9;
+handler test.h2 read first limit 9;
+--error 1109
+handler test.h1 close;
+handler test_test.t1 close;
+handler test_test.h1 close;
+handler h2 close;
+--error 1109
+handler t1 read first limit 9;
+--error 1109
+handler h1 read first limit 9;
+--error 1109
+handler h2 read first limit 9;
+handler h3 read first limit 9;
+handler test_test.h3 read first limit 9;
+use test_test;
+handler h3 read first limit 9;
+--error 1109
+handler test.h3 read first limit 9;
+handler test_test.h3 close;
+use test;
+drop table t3;
+drop table t2;
+drop table t1;
+drop database test_test;
+
+#
+# Test if fix for BUG#4286 correctly closes handler tables.
+#
+create table t1 (c1 char(20));
+insert into t1 values ("t1");
+handler t1 open as h1;
+handler h1 read first limit 9;
+create table t2 (c1 char(20));
+insert into t2 values ("t2");
+handler t2 open as h2;
+handler h2 read first limit 9;
+create table t3 (c1 char(20));
+insert into t3 values ("t3");
+handler t3 open as h3;
+handler h3 read first limit 9;
+create table t4 (c1 char(20));
+insert into t4 values ("t4");
+handler t4 open as h4;
+handler h4 read first limit 9;
+create table t5 (c1 char(20));
+insert into t5 values ("t5");
+handler t5 open as h5;
+handler h5 read first limit 9;
+# close first
+alter table t1 engine=MyISAM;
+--error 1109;
+handler h1 read first limit 9;
+handler h2 read first limit 9;
+handler h3 read first limit 9;
+handler h4 read first limit 9;
+handler h5 read first limit 9;
+# close last
+alter table t5 engine=MyISAM;
+--error 1109;
+handler h1 read first limit 9;
+handler h2 read first limit 9;
+handler h3 read first limit 9;
+handler h4 read first limit 9;
+--error 1109;
+handler h5 read first limit 9;
+# close middle
+alter table t3 engine=MyISAM;
+--error 1109;
+handler h1 read first limit 9;
+handler h2 read first limit 9;
+--error 1109;
+handler h3 read first limit 9;
+handler h4 read first limit 9;
+--error 1109;
+handler h5 read first limit 9;
+handler h2 close;
+handler h4 close;
+# close all depending handler tables
+handler t1 open as h1_1;
+handler t1 open as h1_2;
+handler t1 open as h1_3;
+handler h1_1 read first limit 9;
+handler h1_2 read first limit 9;
+handler h1_3 read first limit 9;
+alter table t1 engine=MyISAM;
+--error 1109;
+handler h1_1 read first limit 9;
+--error 1109;
+handler h1_2 read first limit 9;
+--error 1109;
+handler h1_3 read first limit 9;
+drop table t1;
+drop table t2;
+drop table t3;
+drop table t4;
+drop table t5;