#
# Testing the behavior of 'PREPARE', 'DDL', 'EXECUTE' scenarios
#
# There are several subtests which are probably "superfluous" because a DDL
# statement before the EXECUTE <prepared stmt handle> contained a keyword
# or action (Example: Alter) which causes that all prepared statements using
# the modified object are reprepared before execution.
# Please do not delete these subtests if they disturb. Just disable them by
# if (0)
# {
#    <tests to disable>
# }.
# There might be future optimisations of the server which decrease the amount
# of unneeded reprepares or skip unneeded prepare steps and than these subtests
# might become valuable.
#    Example:
#    Every preceding ALTER TABLE seems to cause a reprepare.
#    But if the ALTER only changed the table comment ...
#
# Created: 2008-04-18 mleich
#

--disable_warnings
drop temporary table if exists t1;
drop table if exists t1, t2;
drop procedure if exists p_verify_reprepare_count;
drop procedure if exists p1;
drop function if exists f1;
drop view if exists t1;
drop schema if exists mysqltest;
--enable_warnings

delimiter |;
create procedure p_verify_reprepare_count(expected int)
begin
  declare old_reprepare_count int default @reprepare_count;

  select variable_value from
  information_schema.session_status where
  variable_name='com_stmt_reprepare'
  into @reprepare_count;

  if old_reprepare_count + expected <> @reprepare_count then
    select concat("Expected: ", expected,
                   ", actual: ", @reprepare_count - old_reprepare_count)
    as "ERROR";
  else
    select '' as "SUCCESS";
  end if;
end|
delimiter ;|
set @reprepare_count= 0;
flush status;

--disable_warnings
drop table if exists t1;
--disable_warnings

--echo # Column added or dropped is not within the list of selected columns
--echo # or table comment has changed.
--echo # A reprepare is probably not needed.
create table t1 (a int, b int);
prepare stmt from "select a from t1";
execute stmt;
call p_verify_reprepare_count(0);
alter table t1 add column c int;
execute stmt;
call p_verify_reprepare_count(1);
execute stmt;
call p_verify_reprepare_count(0);
alter table t1 drop column b;
execute stmt;
call p_verify_reprepare_count(1);
execute stmt;
call p_verify_reprepare_count(0);
alter table t1 comment "My best table";
execute stmt;
call p_verify_reprepare_count(1);
execute stmt;
call p_verify_reprepare_count(0);
drop table t1;
deallocate prepare stmt;

--echo # Selects using the table at various positions, inser,update ...
--echo # + the table disappears
create table t1 (a int);
# Attention:
#   "truncate" must have the first position (= executed as last prepared
#   statement), because it recreates the table which has leads to reprepare
#   (is this really needed) of all statements.
prepare stmt1 from "truncate t1";
prepare stmt2 from "select 1 as my_column from t1";
prepare stmt3 from "select 1 as my_column from (select * from t1) as t2";
prepare stmt4 from
"select 1 as my_column from (select 1) as t2 where exists (select 1 from t1)";
prepare stmt5 from "select * from (select 1 as b) as t2, t1";
prepare stmt6 from "select * from t1 union all select 1.5";
prepare stmt7 from "select 1 as my_column union all select 1 from t1";
prepare stmt8 from "insert into t1 values(1),(2)";
prepare stmt9 from "update t1 set a = 3 where a = 2";
prepare stmt10 from "delete from t1 where a = 1";
let ps_stmt_count= 10;
--echo # Attention: Result logging is disabled.
# Checks of correct results of statements are not the goal of this test.
let $num= $ps_stmt_count;
while ($num)
{
   --disable_result_log
   eval execute stmt$num;
   --enable_result_log
   dec $num;
}
# There was no reprepare needed, because none of the objects has changed.
call p_verify_reprepare_count(0);
drop table t1;
let $num= $ps_stmt_count;
while ($num)
{
   --error ER_NO_SUCH_TABLE
   eval execute stmt$num;
   dec $num;
}
# There was no reprepare needed, because the statement is no more applicable.
call p_verify_reprepare_count(0);
let $num= $ps_stmt_count;
while ($num)
{
   eval deallocate prepare stmt$num;
   dec $num;
}

--echo # Selects using the table at various positions, inser,update ...
--echo # + layout change (drop column) which must cause a reprepare
create table t1 (a int, b int);
insert into t1 values(1,1),(2,2),(3,3);
create table t2 like t1;
insert into t1 values(2,2);
prepare stmt1 from "select a,b from t1";
prepare stmt2 from "select a,b from (select * from t1) as t1";
prepare stmt3 from "select * from t1 where a = 2 and b = 2";
prepare stmt4 from "select * from t2 where (a,b) in (select * from t1)";
prepare stmt5 from "select * from t1 union select * from t2";
prepare stmt6 from "select * from t1 union all select * from t2";
prepare stmt7 from "insert into t1 set a = 4, b = 4";
prepare stmt8 from "insert into t1 select * from t2";
let ps_stmt_count= 8;
--echo # Attention: Result logging is disabled.
# Checks of correct results of statements are not the goal of this test.
let $num= $ps_stmt_count;
while ($num)
{
   --disable_result_log
   eval execute stmt$num;
   --enable_result_log
   dec $num;
}
call p_verify_reprepare_count(0);
alter table t1 drop column b;
--disable_abort_on_error
let $num= $ps_stmt_count;
while ($num)
{
   eval execute stmt$num;
   # A reprepare is needed, because layout change of t1 affects statement.
   call p_verify_reprepare_count(1);
   dec $num;
}
let $num= $ps_stmt_count;
while ($num)
{
   eval execute stmt$num;
   call p_verify_reprepare_count(1);
   dec $num;
}
--echo # Why does the INSERT ... SELECT does not get a reprepare or is
--echo # only the counter not incremented?
eval execute stmt8;
call p_verify_reprepare_count(1);
--enable_abort_on_error
alter table t2 add column c int;
--error ER_WRONG_VALUE_COUNT_ON_ROW
eval execute stmt8;
call p_verify_reprepare_count(1);
let $num= $ps_stmt_count;
while ($num)
{
   eval deallocate prepare stmt$num;
   dec $num;
}
drop table t1;
drop table t2;


--echo # select AVG(<col>) + optimizer uses index meets loss of the index
create table t1 (a int, b int, primary key(b),unique index t1_unq_idx(a));
# We need an index which is not converted to PRIMARY KEY (becomes in
# case of InnoDB the key used for table clustering).
insert into t1 set a = 0, b = 0;
insert into t1 select a + 1, b + 1 from t1;
insert into t1 select a + 2, b + 2 from t1;
insert into t1 select a + 4, b + 4 from t1;
insert into t1 select a + 8, b + 8 from t1;
# "using index" optimizer strategy is intended
let $possible_keys=
    query_get_value(explain select avg(a) from t1, possible_keys, 1);
let $extra=
    query_get_value(explain select avg(a) from t1, Extra, 1);
--echo # Optimizer strategy: Possible keys = $possible_keys , Extra = $extra
prepare stmt from "select avg(a) from t1";
execute stmt;
call p_verify_reprepare_count(0);
execute stmt;
call p_verify_reprepare_count(0);

alter table t1 drop index t1_unq_idx;
let $possible_keys=
    query_get_value(explain select avg(a) from t1, possible_keys, 1);
let $extra=
    query_get_value(explain select avg(a) from t1, Extra, 1);
--echo # Optimizer strategy: Possible keys = $possible_keys , Extra = $extra
execute stmt;
call p_verify_reprepare_count(1);
execute stmt;
call p_verify_reprepare_count(0);


--echo # select AVG(<col>) + optimizer uses table scan meets a new index
alter table t1 add unique index t1_unq_idx(a);
let $possible_keys=
    query_get_value(explain select avg(a) from t1, possible_keys, 1);
let $extra=
    query_get_value(explain select avg(a) from t1, Extra, 1);
--echo # Optimizer strategy: Possible keys = $possible_keys , Extra = $extra
execute stmt;
call p_verify_reprepare_count(1);
execute stmt;
call p_verify_reprepare_count(0);

deallocate prepare stmt;
drop table t1;


--echo # table replaced by not updatable view - Insert
create table t1 (a int);
prepare stmt from "insert into t1 values(1)";
execute stmt;
call p_verify_reprepare_count(0);

drop table t1;
create view t1 as select 1;
--error ER_NON_INSERTABLE_TABLE
execute stmt;
call p_verify_reprepare_count(1);

drop view t1;
create table t2 (a int);
create view t1 as select * from t2 with check option;
execute stmt;
call p_verify_reprepare_count(1);
execute stmt;
call p_verify_reprepare_count(0);
select * from t1;

deallocate prepare stmt;
drop view t1;
drop table t2;


--echo =====================================================================
--echo Some freestyle tests
--echo =====================================================================

create temporary table t1 as select 1 as a;
delimiter |;
create procedure p1()
begin
  drop temporary table t1;
end|
create function f1() returns int
begin
  call p1();
  return 1;
end|
delimiter ;|

prepare stmt from "select f1() as my_column, a from t1";
--error ER_CANT_REOPEN_TABLE
execute stmt;
call p_verify_reprepare_count(0);
select * from t1;

prepare stmt from "select a, f1() as my_column from t1";
--error ER_CANT_REOPEN_TABLE
execute stmt;
call p_verify_reprepare_count(0);
select * from t1;

prepare stmt from "select f1() as my_column, count(*) from t1";
--error ER_CANT_REOPEN_TABLE
execute stmt;
call p_verify_reprepare_count(0);
select * from t1;

prepare stmt from "select count(*), f1() as my_column from t1";
--error ER_CANT_REOPEN_TABLE
execute stmt;
call p_verify_reprepare_count(0);
select * from t1;


--echo # Execute fails, no drop of temporary table
prepare stmt from "select 1 as my_column from (select 1) as t2
                   where exists (select f1() from t1)";
execute stmt;
call p_verify_reprepare_count(0);
execute stmt;
call p_verify_reprepare_count(0);
select * from t1;

--echo # Execute drops temporary table
prepare stmt from "select f1()";
execute stmt;
call p_verify_reprepare_count(0);
--error ER_BAD_TABLE_ERROR
execute stmt;
call p_verify_reprepare_count(0);

drop function f1;
drop procedure p1;
deallocate prepare stmt;

--echo # Execute fails, temporary table is not replaced by another
create temporary table t1 as select 1 as a;
delimiter |;
create procedure p1()
begin
  drop temporary table t1;
  create temporary table t1 as select 'abc' as a;
end|
create function f1() returns int
begin
  call p1();
  return 1;
end|
delimiter ;|
prepare stmt from "select count(*), f1() as my_column from t1";
--error ER_CANT_REOPEN_TABLE
execute stmt;
call p_verify_reprepare_count(0);
select * from t1;
deallocate prepare stmt;

prepare stmt from "call p1";
execute stmt;
drop procedure p1;
create schema mysqltest;
delimiter |;
create procedure mysqltest.p1()
begin
   drop schema mysqltest;
   create schema mysqltest;
end|
delimiter ;|
--error ER_SP_DOES_NOT_EXIST
execute stmt;
call p_verify_reprepare_count(1);
--error ER_SP_DOES_NOT_EXIST
execute stmt;
call p_verify_reprepare_count(0);
deallocate prepare stmt;
drop schema mysqltest;
drop temporary table t1;


# Bug#36089 drop temp table in SP called by function, crash
# Note: A non prepared "select 1 from t1 having count(*) = f1();" is sufficient. 
if (0)
{
create temporary table t1 as select 1 as a;
prepare stmt from "select 1 from t1 having count(*) = f1()";
execute stmt;
call p_verify_reprepare_count(0);
deallocate prepare stmt;
drop temporary table t1;
}


--echo # Cleanup
--echo #
--disable_warnings
drop temporary table if exists t1;
drop table if exists t1, t2;
drop procedure if exists p_verify_reprepare_count;
drop procedure if exists p1;
drop function if exists f1;
drop view if exists t1;
drop schema if exists mysqltest;
--enable_warnings
