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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| 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); 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); SUCCESS 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 = NULL 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;