#
# Test of update statement that uses many tables.
#

#
# If we are running with
# - Valgrind           -> $VALGRIND_TEST <> 0
# - debug tracing      -> @@session.debug LIKE '%trace%'
# the resource consumption (storage space needed, runtime) will be extreme.
# Therefore we require that the option "--big-test" is also set.
#

let $need_big= 0;
--disable_query_log
--error 0,ER_UNKNOWN_SYSTEM_VARIABLE
SET @aux = @@session.debug;
if (!$mysql_errno)
{
  # We have returncode 0 = the server system variable @@session.debug exists.
  # But we only need "--big-test" in case of tracing.
  if (`SELECT @@session.debug LIKE '%trace%'`)
  {
    let $need_big= 1;
  }
}
--enable_query_log
if ($VALGRIND_TEST)
{
  # We are running with Valgrind
  inc $need_big;
}
if (`SELECT '$BIG_TEST' = '' AND $need_big = 1`)
{
  --skip Need "--big-test" when running with the option "--debug" or "--valgrind"
}

#
# Bug#1820 Rows not deleted from second table on multi-table delete
#

--disable_warnings
DROP TABLE IF EXISTS t1,t2;
--enable_warnings

CREATE TABLE t1 ( a INT NOT NULL, b INT NOT NULL) ;
--echo # The protocolling of many inserts into t1 is suppressed.
--disable_query_log
INSERT INTO t1 VALUES (1,1),(2,2),(3,3),(4,4);
let $1=19;
set @d=4;
while ($1)
{
  eval INSERT INTO t1 SELECT a+@d,b+@d FROM t1;
  eval SET @d=@d*2;
  dec $1;
}

--enable_query_log
ALTER TABLE t1 ADD INDEX i1(a);
DELETE FROM t1 WHERE a > 2000000;
CREATE TABLE t2 LIKE t1;
INSERT INTO t2 SELECT * FROM t1;

SELECT 't2 rows before small delete', COUNT(*) FROM t1;
DELETE t1,t2 FROM t1,t2 WHERE t1.b=t2.a AND t1.a < 2;
SELECT 't2 rows after small delete', COUNT(*) FROM t2;
SELECT 't1 rows after small delete', COUNT(*) FROM t1;

## Try deleting many rows 

DELETE t1,t2 FROM t1,t2 WHERE t1.b=t2.a AND t1.a < 100*1000;
SELECT 't2 rows after big delete', COUNT(*) FROM t2;
SELECT 't1 rows after big delete', COUNT(*) FROM t1;

DROP TABLE t1,t2;
