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;
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|
Warnings:
Warning	1287	'<select expression> INTO <destination>;' is deprecated and will be removed in a future release. Please use 'SELECT <select list> INTO <destination> FROM...' instead
set @reprepare_count= 0;
flush status;
drop table if exists t1;
# Column added or dropped is not within the list of selected columns
# or table comment has changed.
# A reprepare is probably not needed.
create table t1 (a int, b int);
prepare stmt from "select a from t1";
execute stmt;
a
call p_verify_reprepare_count(0);
SUCCESS

alter table t1 add column c int;
execute stmt;
a
call p_verify_reprepare_count(1);
SUCCESS

execute stmt;
a
call p_verify_reprepare_count(0);
SUCCESS

alter table t1 drop column b;
execute stmt;
a
call p_verify_reprepare_count(1);
SUCCESS

execute stmt;
a
call p_verify_reprepare_count(0);
SUCCESS

alter table t1 comment "My best table";
execute stmt;
a
call p_verify_reprepare_count(1);
SUCCESS

execute stmt;
a
call p_verify_reprepare_count(0);
SUCCESS

drop table t1;
deallocate prepare stmt;
# Selects using the table at various positions, inser,update ...
# + the table disappears
create table t1 (a int);
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";
# Attention: Result logging is disabled.
execute stmt10;
execute stmt9;
execute stmt8;
execute stmt7;
execute stmt6;
execute stmt5;
execute stmt4;
execute stmt3;
execute stmt2;
execute stmt1;
call p_verify_reprepare_count(0);
SUCCESS

drop table t1;
execute stmt10;
ERROR 42S02: Table 'test.t1' doesn't exist
execute stmt9;
ERROR 42S02: Table 'test.t1' doesn't exist
execute stmt8;
ERROR 42S02: Table 'test.t1' doesn't exist
execute stmt7;
ERROR 42S02: Table 'test.t1' doesn't exist
execute stmt6;
ERROR 42S02: Table 'test.t1' doesn't exist
execute stmt5;
ERROR 42S02: Table 'test.t1' doesn't exist
execute stmt4;
ERROR 42S02: Table 'test.t1' doesn't exist
execute stmt3;
ERROR 42S02: Table 'test.t1' doesn't exist
execute stmt2;
ERROR 42S02: Table 'test.t1' doesn't exist
execute stmt1;
ERROR 42S02: Table 'test.t1' doesn't exist
call p_verify_reprepare_count(0);
SUCCESS

deallocate prepare stmt10;
deallocate prepare stmt9;
deallocate prepare stmt8;
deallocate prepare stmt7;
deallocate prepare stmt6;
deallocate prepare stmt5;
deallocate prepare stmt4;
deallocate prepare stmt3;
deallocate prepare stmt2;
deallocate prepare stmt1;
# Selects using the table at various positions, inser,update ...
# + 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";
# Attention: Result logging is disabled.
execute stmt8;
execute stmt7;
execute stmt6;
execute stmt5;
execute stmt4;
execute stmt3;
execute stmt2;
execute stmt1;
call p_verify_reprepare_count(0);
SUCCESS

alter table t1 drop column b;
execute stmt8;
ERROR 21S01: Column count doesn't match value count at row 1
call p_verify_reprepare_count(1);
SUCCESS

execute stmt7;
ERROR 42S22: Unknown column 'b' in 'field list'
call p_verify_reprepare_count(1);
SUCCESS

execute stmt6;
ERROR 21000: The used SELECT statements have a different number of columns
call p_verify_reprepare_count(1);
SUCCESS

execute stmt5;
ERROR 21000: The used SELECT statements have a different number of columns
call p_verify_reprepare_count(1);
SUCCESS

execute stmt4;
ERROR 21000: Operand should contain 2 column(s)
call p_verify_reprepare_count(1);
SUCCESS

execute stmt3;
ERROR 42S22: Unknown column 'b' in 'where clause'
call p_verify_reprepare_count(1);
SUCCESS

execute stmt2;
ERROR 42S22: Unknown column 'b' in 'field list'
call p_verify_reprepare_count(1);
SUCCESS

execute stmt1;
ERROR 42S22: Unknown column 'b' in 'field list'
call p_verify_reprepare_count(1);
SUCCESS

execute stmt8;
ERROR 21S01: Column count doesn't match value count at row 1
call p_verify_reprepare_count(1);
ERROR
Expected: 1, actual: 0
execute stmt7;
ERROR 42S22: Unknown column 'b' in 'field list'
call p_verify_reprepare_count(1);
SUCCESS

execute stmt6;
ERROR 21000: The used SELECT statements have a different number of columns
call p_verify_reprepare_count(1);
SUCCESS

execute stmt5;
ERROR 21000: The used SELECT statements have a different number of columns
call p_verify_reprepare_count(1);
SUCCESS

execute stmt4;
ERROR 21000: Operand should contain 2 column(s)
call p_verify_reprepare_count(1);
SUCCESS

execute stmt3;
ERROR 42S22: Unknown column 'b' in 'where clause'
call p_verify_reprepare_count(1);
SUCCESS

execute stmt2;
ERROR 42S22: Unknown column 'b' in 'field list'
call p_verify_reprepare_count(1);
SUCCESS

execute stmt1;
ERROR 42S22: Unknown column 'b' in 'field list'
call p_verify_reprepare_count(1);
SUCCESS

# Why does the INSERT ... SELECT does not get a reprepare or is
# only the counter not incremented?
execute stmt8;
ERROR 21S01: Column count doesn't match value count at row 1
call p_verify_reprepare_count(1);
ERROR
Expected: 1, actual: 0
alter table t2 add column c int;
execute stmt8;
ERROR 21S01: Column count doesn't match value count at row 1
call p_verify_reprepare_count(1);
SUCCESS

deallocate prepare stmt8;
deallocate prepare stmt7;
deallocate prepare stmt6;
deallocate prepare stmt5;
deallocate prepare stmt4;
deallocate prepare stmt3;
deallocate prepare stmt2;
deallocate prepare stmt1;
drop table t1;
drop table t2;
# 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));
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;
# Optimizer strategy: Possible keys = NULL , Extra = Using index
prepare stmt from "select avg(a) from t1";
execute stmt;
avg(a)
7.5000
call p_verify_reprepare_count(0);
SUCCESS

execute stmt;
avg(a)
7.5000
call p_verify_reprepare_count(0);
SUCCESS

alter table t1 drop index t1_unq_idx;
# Optimizer strategy: Possible keys = NULL , Extra = 
execute stmt;
avg(a)
7.5000
call p_verify_reprepare_count(1);
SUCCESS

execute stmt;
avg(a)
7.5000
call p_verify_reprepare_count(0);
SUCCESS

# select AVG(<col>) + optimizer uses table scan meets a new index
alter table t1 add unique index t1_unq_idx(a);
# Optimizer strategy: Possible keys = NULL , Extra = Using index
execute stmt;
avg(a)
7.5000
call p_verify_reprepare_count(1);
SUCCESS

execute stmt;
avg(a)
7.5000
call p_verify_reprepare_count(0);
SUCCESS

deallocate prepare stmt;
drop table t1;
# 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);
SUCCESS

drop table t1;
create view t1 as select 1;
execute stmt;
ERROR HY000: The target table t1 of the INSERT is not insertable-into
call p_verify_reprepare_count(1);
SUCCESS

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);
SUCCESS

execute stmt;
call p_verify_reprepare_count(0);
SUCCESS

select * from t1;
a
1
1
deallocate prepare stmt;
drop view t1;
drop table t2;
=====================================================================
Some freestyle tests
=====================================================================
create temporary table t1 as select 1 as a;
create procedure p1()
begin
drop temporary table t1;
end|
create function f1() returns int
begin
call p1();
return 1;
end|
prepare stmt from "select f1() as my_column, a from t1";
execute stmt;
ERROR HY000: Can't reopen table: 't1'
call p_verify_reprepare_count(0);
SUCCESS

select * from t1;
a
1
prepare stmt from "select a, f1() as my_column from t1";
execute stmt;
ERROR HY000: Can't reopen table: 't1'
call p_verify_reprepare_count(0);
SUCCESS

select * from t1;
a
1
prepare stmt from "select f1() as my_column, count(*) from t1";
execute stmt;
ERROR HY000: Can't reopen table: 't1'
call p_verify_reprepare_count(0);
SUCCESS

select * from t1;
a
1
prepare stmt from "select count(*), f1() as my_column from t1";
execute stmt;
ERROR HY000: Can't reopen table: 't1'
call p_verify_reprepare_count(0);
SUCCESS

select * from t1;
a
1
# 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;
my_column
1
call p_verify_reprepare_count(0);
SUCCESS

execute stmt;
my_column
1
call p_verify_reprepare_count(0);
SUCCESS

select * from t1;
a
1
# Execute drops temporary table
prepare stmt from "select f1()";
execute stmt;
f1()
1
call p_verify_reprepare_count(0);
SUCCESS

execute stmt;
ERROR 42S02: Unknown table 'test.t1'
call p_verify_reprepare_count(0);
SUCCESS

drop function f1;
drop procedure p1;
deallocate prepare stmt;
# Execute fails, temporary table is not replaced by another
create temporary table t1 as select 1 as a;
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|
prepare stmt from "select count(*), f1() as my_column from t1";
execute stmt;
ERROR HY000: Can't reopen table: 't1'
call p_verify_reprepare_count(0);
SUCCESS

select * from t1;
a
1
deallocate prepare stmt;
prepare stmt from "call p1";
execute stmt;
drop procedure p1;
create schema mysqltest;
create procedure mysqltest.p1()
begin
drop schema mysqltest;
create schema mysqltest;
end|
execute stmt;
ERROR 42000: PROCEDURE test.p1 does not exist
call p_verify_reprepare_count(0);
SUCCESS

execute stmt;
ERROR 42000: PROCEDURE test.p1 does not exist
call p_verify_reprepare_count(0);
SUCCESS

deallocate prepare stmt;
drop schema mysqltest;
drop temporary table t1;
# Cleanup
#
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;