From: Date: January 9 2009 11:20am
Subject: bzr commit into mysql-5.1-bugteam branch (davi:2735) Bug#37016
List-Archive: http://lists.mysql.com/commits/62785
X-Bug: 37016
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# At a local mysql-5.1-bugteam repository of davi

 2735 Davi Arnaut	2009-01-09
      Bug#37016: TRUNCATE TABLE removes some rows but not all
      
      The special TRUNCATE TABLE (DDL) transaction wasn't being properly
      rolled back if a error occurred during row by row deletion. The
      error can be caused by a foreign key restriction imposed by InnoDB
      SE and would cause the server to erroneously issue a implicit
      commit.
      
      The solution is to rollback the transaction if a truncation via row
      by row deletion fails, otherwise commit. All effects of a TRUNCATE 
      ABLE operation are rolled back if a row by row deletion fails.
modified:
  mysql-test/include/commit.inc
  mysql-test/r/commit_1innodb.result
  mysql-test/r/innodb_mysql.result
  mysql-test/t/innodb_mysql.test
  sql/sql_delete.cc

per-file messages:
  mysql-test/include/commit.inc
    Truncate always starts a transaction and commits at the end.
    The commit at the end increases the count by two, one is the
    storage engine commit and the other is the binary log.
  mysql-test/r/commit_1innodb.result
    Update test case results.
  mysql-test/r/innodb_mysql.result
    Update test case results.
  mysql-test/t/innodb_mysql.test
    Add test case for Bug#37016
  sql/sql_delete.cc
    Move truncation using row by row deletion to its own function.
    If row by row deletion fails, rollback the transaction.
    
    Remove the meddling with disabling and enabling of autocommit
    as TRUNCATE transaction is now explicitly ended (committed
    or rolled back).
=== modified file 'mysql-test/include/commit.inc'
--- a/mysql-test/include/commit.inc	2008-12-12 12:52:20 +0000
+++ b/mysql-test/include/commit.inc	2009-01-09 10:20:32 +0000
@@ -617,10 +617,10 @@ call p_verify_status_increment(0, 0, 0, 
 --echo
 --echo # No test because of Bug#8729 "rename table fails on temporary table"
 
---echo # 24. DDL: TRUNCATE TEMPORARY TABLE, does not start a transaction
+--echo # 24. DDL: TRUNCATE TEMPORARY TABLE
 --echo
 truncate table t2;
-call p_verify_status_increment(2, 0, 2, 0);
+call p_verify_status_increment(4, 0, 4, 0);
 commit;
 --echo # There is nothing left to commit
 call p_verify_status_increment(0, 0, 0, 0);
@@ -733,7 +733,7 @@ call p_verify_status_increment(1, 0, 1, 
 rename table t4 to t3;
 call p_verify_status_increment(1, 0, 1, 0);
 truncate table t3;
-call p_verify_status_increment(2, 2, 2, 2);
+call p_verify_status_increment(4, 4, 2, 2);
 create view v1 as select * from t2;
 call p_verify_status_increment(1, 0, 1, 0);
 check table t1;

=== modified file 'mysql-test/r/commit_1innodb.result'
--- a/mysql-test/r/commit_1innodb.result	2008-12-12 12:52:20 +0000
+++ b/mysql-test/r/commit_1innodb.result	2009-01-09 10:20:32 +0000
@@ -683,10 +683,10 @@ SUCCESS
 # 23. DDL: RENAME TEMPORARY TABLE, does not start a transaction
 
 # No test because of Bug#8729 "rename table fails on temporary table"
-# 24. DDL: TRUNCATE TEMPORARY TABLE, does not start a transaction
+# 24. DDL: TRUNCATE TEMPORARY TABLE
 
 truncate table t2;
-call p_verify_status_increment(2, 0, 2, 0);
+call p_verify_status_increment(4, 0, 4, 0);
 SUCCESS
 
 commit;
@@ -853,7 +853,7 @@ call p_verify_status_increment(1, 0, 1, 
 SUCCESS
 
 truncate table t3;
-call p_verify_status_increment(2, 2, 2, 2);
+call p_verify_status_increment(4, 4, 2, 2);
 SUCCESS
 
 create view v1 as select * from t2;

=== modified file 'mysql-test/r/innodb_mysql.result'
--- a/mysql-test/r/innodb_mysql.result	2009-01-07 12:11:37 +0000
+++ b/mysql-test/r/innodb_mysql.result	2009-01-09 10:20:32 +0000
@@ -1788,4 +1788,62 @@ DEALLOCATE PREPARE stmt1;
 DEALLOCATE PREPARE stmt3;
 DROP TABLE t1,t3,t2;
 DROP FUNCTION f1;
+DROP TABLE IF EXISTS t1,t2;
+CREATE TABLE t1 (id INT NOT NULL, PRIMARY KEY (id)) ENGINE=INNODB;
+CREATE TABLE t2 (id INT PRIMARY KEY,
+t1_id INT, INDEX par_ind (t1_id),
+FOREIGN KEY (t1_id) REFERENCES t1(id)) ENGINE=INNODB;
+INSERT INTO t1 VALUES (1),(2);
+INSERT INTO t2 VALUES (3,2);
+SET AUTOCOMMIT = 0;
+START TRANSACTION;
+TRUNCATE TABLE t1;
+ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`t1_id`) REFERENCES `t1` (`id`))
+SELECT * FROM t1;
+id
+1
+2
+COMMIT;
+SELECT * FROM t1;
+id
+1
+2
+START TRANSACTION;
+TRUNCATE TABLE t1;
+ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`t1_id`) REFERENCES `t1` (`id`))
+SELECT * FROM t1;
+id
+1
+2
+ROLLBACK;
+SELECT * FROM t1;
+id
+1
+2
+SET AUTOCOMMIT = 1;
+START TRANSACTION;
+SELECT * FROM t1;
+id
+1
+2
+COMMIT;
+TRUNCATE TABLE t1;
+ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`t1_id`) REFERENCES `t1` (`id`))
+SELECT * FROM t1;
+id
+1
+2
+DELETE FROM t2 WHERE id = 3;
+START TRANSACTION;
+SELECT * FROM t1;
+id
+1
+2
+TRUNCATE TABLE t1;
+ROLLBACK;
+SELECT * FROM t1;
+id
+TRUNCATE TABLE t2;
+DROP TABLE t2;
+DROP TABLE t1;
 End of 5.1 tests

=== modified file 'mysql-test/t/innodb_mysql.test'
--- a/mysql-test/t/innodb_mysql.test	2009-01-07 12:11:37 +0000
+++ b/mysql-test/t/innodb_mysql.test	2009-01-09 10:20:32 +0000
@@ -132,4 +132,56 @@ DEALLOCATE PREPARE stmt3;
 DROP TABLE t1,t3,t2;
 DROP FUNCTION f1;
 
+#
+# Bug#37016: TRUNCATE TABLE removes some rows but not all
+#
+
+--disable_warnings
+DROP TABLE IF EXISTS t1,t2;
+--enable_warnings
+
+CREATE TABLE t1 (id INT NOT NULL, PRIMARY KEY (id)) ENGINE=INNODB;
+CREATE TABLE t2 (id INT PRIMARY KEY,
+                 t1_id INT, INDEX par_ind (t1_id),
+                 FOREIGN KEY (t1_id) REFERENCES t1(id)) ENGINE=INNODB;
+INSERT INTO t1 VALUES (1),(2);
+INSERT INTO t2 VALUES (3,2);
+
+SET AUTOCOMMIT = 0;
+
+START TRANSACTION;
+--error ER_ROW_IS_REFERENCED_2
+TRUNCATE TABLE t1;
+SELECT * FROM t1;
+COMMIT;
+SELECT * FROM t1;
+
+START TRANSACTION;
+--error ER_ROW_IS_REFERENCED_2
+TRUNCATE TABLE t1;
+SELECT * FROM t1;
+ROLLBACK;
+SELECT * FROM t1;
+
+SET AUTOCOMMIT = 1;
+
+START TRANSACTION;
+SELECT * FROM t1;
+COMMIT;
+
+--error ER_ROW_IS_REFERENCED_2
+TRUNCATE TABLE t1;
+SELECT * FROM t1;
+DELETE FROM t2 WHERE id = 3;
+
+START TRANSACTION;
+SELECT * FROM t1;
+TRUNCATE TABLE t1;
+ROLLBACK;
+SELECT * FROM t1;
+TRUNCATE TABLE t2;
+
+DROP TABLE t2;
+DROP TABLE t1;
+
 --echo End of 5.1 tests

=== modified file 'sql/sql_delete.cc'
--- a/sql/sql_delete.cc	2008-11-03 13:08:42 +0000
+++ b/sql/sql_delete.cc	2009-01-09 10:20:32 +0000
@@ -951,6 +951,26 @@ bool multi_delete::send_eof()
 ****************************************************************************/
 
 /*
+  Row-by-row truncation if the engine does not support table recreation.
+  Probably a InnoDB table.
+*/
+
+static bool mysql_truncate_by_delete(THD *thd, TABLE_LIST *table_list)
+{
+  bool error, save_binlog_row_based= thd->current_stmt_binlog_row_based;
+  DBUG_ENTER("mysql_truncate_by_delete");
+  table_list->lock_type= TL_WRITE;
+  mysql_init_select(thd->lex);
+  thd->clear_current_stmt_binlog_row_based();
+  error= mysql_delete(thd, table_list, NULL, NULL, HA_POS_ERROR, LL(0), TRUE);
+  ha_autocommit_or_rollback(thd, error);
+  end_trans(thd, error ? ROLLBACK : COMMIT);
+  thd->current_stmt_binlog_row_based= save_binlog_row_based;
+  DBUG_RETURN(error);
+}
+
+
+/*
   Optimize delete of all rows by doing a full generate of the table
   This will work even if the .ISM and .ISD tables are destroyed
 
@@ -1055,24 +1075,6 @@ end:
   DBUG_RETURN(error);
 
 trunc_by_del:
-  /* Probably InnoDB table */
-  ulonglong save_options= thd->options;
-  table_list->lock_type= TL_WRITE;
-  thd->options&= ~(OPTION_BEGIN | OPTION_NOT_AUTOCOMMIT);
-  ha_enable_transaction(thd, FALSE);
-  mysql_init_select(thd->lex);
-  bool save_binlog_row_based= thd->current_stmt_binlog_row_based;
-  thd->clear_current_stmt_binlog_row_based();
-  error= mysql_delete(thd, table_list, (COND*) 0, (SQL_LIST*) 0,
-                      HA_POS_ERROR, LL(0), TRUE);
-  ha_enable_transaction(thd, TRUE);
-  /*
-    Safety, in case the engine ignored ha_enable_transaction(FALSE)
-    above. Also clears thd->transaction.*.
-  */
-  error= ha_autocommit_or_rollback(thd, error);
-  ha_commit(thd);
-  thd->options= save_options;
-  thd->current_stmt_binlog_row_based= save_binlog_row_based;
+  error= mysql_truncate_by_delete(thd, table_list);
   DBUG_RETURN(error);
 }