From 0de565a56475e355eb77225981256348c698b9b6 Mon Sep 17 00:00:00 2001 From: Igor Babaev Date: Thu, 4 Jan 2018 23:40:37 -0800 Subject: [PATCH] Fixed mdev-14852 Fails to reopen temp table within standard CTE If the specification of a CTE contains a reference to a temporary table then THD::open_temporary_table() must be called for this reference for any occurrence of the CTE in the query. By mistake this was done only for the first occurrences of CTEs. The patch fixes this problem in With_element::clone_parsed_spec(). It also moves there the call of check_dependencies_in_with_clauses() to its proper place before the call of check_table_access(). Additionally the patch optimizes the number of calls of the function check_dependencies_in_with_clauses(). --- mysql-test/r/cte_nonrecursive.result | 30 ++++++++++++++++++++++++++++ mysql-test/t/cte_nonrecursive.test | 29 +++++++++++++++++++++++++++ sql/sql_cte.cc | 7 +++++++ sql/sql_parse.cc | 22 +++++--------------- sql/sql_prepare.cc | 11 +++------- 5 files changed, 74 insertions(+), 25 deletions(-) diff --git a/mysql-test/r/cte_nonrecursive.result b/mysql-test/r/cte_nonrecursive.result index b1b41b1c5e7..c1f4c9fd486 100644 --- a/mysql-test/r/cte_nonrecursive.result +++ b/mysql-test/r/cte_nonrecursive.result @@ -1265,3 +1265,33 @@ a 4 deallocate prepare stmt; drop table t1; +# +# MDEV-14852: CTE using temporary table in query +# with two references to the CTE +# +create temporary table t1 (i int); +insert into t1 values (5),(4),(1),(2),(3); +with +c1 as (select i from t1), +c2 as (select i from c1 where c1.i=2) +select i from c1 where i > 3 union select i from c2; +i +5 +4 +2 +drop table t1; +create table t1 (term char(10)); +create temporary table t2 (term char(10)); +insert into t1 values ('TERM01'),('TERM02'),('TERM03'); +insert into t2 values ('TERM02'),('TERM03'),('TERM04'); +with c1 as (select * from t1), c2 as (select * from t2) +(select * from c1 left outer join c2 on c1.term = c2.term) +union all +(select * from c1 right outer join c2 on c1.term = c2.term +where c1.term is null); +term term +TERM02 TERM02 +TERM03 TERM03 +TERM01 NULL +NULL TERM04 +drop table t1,t2; diff --git a/mysql-test/t/cte_nonrecursive.test b/mysql-test/t/cte_nonrecursive.test index 1f21dbcd36d..9436665bfee 100644 --- a/mysql-test/t/cte_nonrecursive.test +++ b/mysql-test/t/cte_nonrecursive.test @@ -853,3 +853,32 @@ execute stmt; deallocate prepare stmt; drop table t1; + +--echo # +--echo # MDEV-14852: CTE using temporary table in query +--echo # with two references to the CTE +--echo # + +create temporary table t1 (i int); +insert into t1 values (5),(4),(1),(2),(3); + +with +c1 as (select i from t1), +c2 as (select i from c1 where c1.i=2) +select i from c1 where i > 3 union select i from c2; + +drop table t1; + +create table t1 (term char(10)); +create temporary table t2 (term char(10)); + +insert into t1 values ('TERM01'),('TERM02'),('TERM03'); +insert into t2 values ('TERM02'),('TERM03'),('TERM04'); + +with c1 as (select * from t1), c2 as (select * from t2) +(select * from c1 left outer join c2 on c1.term = c2.term) +union all +(select * from c1 right outer join c2 on c1.term = c2.term + where c1.term is null); + +drop table t1,t2; diff --git a/sql/sql_cte.cc b/sql/sql_cte.cc index 601c1928d58..d12948fb624 100644 --- a/sql/sql_cte.cc +++ b/sql/sql_cte.cc @@ -817,12 +817,19 @@ st_select_lex_unit *With_element::clone_parsed_spec(THD *thd, parse_status= parse_sql(thd, &parser_state, 0); if (parse_status) goto err; + + if (check_dependencies_in_with_clauses(lex->with_clauses_list)) + goto err; + spec_tables= lex->query_tables; spec_tables_tail= 0; for (TABLE_LIST *tbl= spec_tables; tbl; tbl= tbl->next_global) { + if (!tbl->derived && !tbl->schema_table && + thd->open_temporary_table(tbl)) + goto err; spec_tables_tail= tbl; } if (check_table_access(thd, SELECT_ACL, spec_tables, FALSE, UINT_MAX, FALSE)) diff --git a/sql/sql_parse.cc b/sql/sql_parse.cc index f00c74b155c..6d068eb99ac 100644 --- a/sql/sql_parse.cc +++ b/sql/sql_parse.cc @@ -2990,6 +2990,9 @@ mysql_execute_command(THD *thd) thd->get_stmt_da()->opt_clear_warning_info(thd->query_id); } + if (check_dependencies_in_with_clauses(thd->lex->with_clauses_list)) + DBUG_RETURN(1); + #ifdef HAVE_REPLICATION if (unlikely(thd->slave_thread)) { @@ -3446,14 +3449,6 @@ mysql_execute_command(THD *thd) ulong privileges_requested= lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL; - /* - The same function must be called for DML commands - when CTEs are supported in DML statements - */ - res= check_dependencies_in_with_clauses(thd->lex->with_clauses_list); - if (res) - break; - if (all_tables) res= check_table_access(thd, privileges_requested, @@ -3879,8 +3874,7 @@ mysql_execute_command(THD *thd) /* Copy temporarily the statement flags to thd for lock_table_names() */ uint save_thd_create_info_options= thd->lex->create_info.options; thd->lex->create_info.options|= create_info.options; - if (!(res= check_dependencies_in_with_clauses(lex->with_clauses_list))) - res= open_and_lock_tables(thd, create_info, lex->query_tables, TRUE, 0); + res= open_and_lock_tables(thd, create_info, lex->query_tables, TRUE, 0); thd->lex->create_info.options= save_thd_create_info_options; if (res) { @@ -4493,8 +4487,7 @@ end_with_restore_list: unit->set_limit(select_lex); - if (!(res= check_dependencies_in_with_clauses(lex->with_clauses_list)) && - !(res=open_and_lock_tables(thd, all_tables, TRUE, 0))) + if (!(res=open_and_lock_tables(thd, all_tables, TRUE, 0))) { MYSQL_INSERT_SELECT_START(thd->query()); /* @@ -4821,9 +4814,6 @@ end_with_restore_list: { List *lex_var_list= &lex->var_list; - if (check_dependencies_in_with_clauses(thd->lex->with_clauses_list)) - goto error; - if ((check_table_access(thd, SELECT_ACL, all_tables, FALSE, UINT_MAX, FALSE) || open_and_lock_tables(thd, all_tables, TRUE, 0))) goto error; @@ -6376,8 +6366,6 @@ static bool execute_sqlcom_select(THD *thd, TABLE_LIST *all_tables) new (thd->mem_root) Item_int(thd, (ulonglong) thd->variables.select_limit); } - if (check_dependencies_in_with_clauses(lex->with_clauses_list)) - return 1; if (!(res= open_and_lock_tables(thd, all_tables, TRUE, 0))) { diff --git a/sql/sql_prepare.cc b/sql/sql_prepare.cc index be78a76152e..390b70877f5 100644 --- a/sql/sql_prepare.cc +++ b/sql/sql_prepare.cc @@ -1573,8 +1573,6 @@ static int mysql_test_select(Prepared_statement *stmt, lex->select_lex.context.resolve_in_select_list= TRUE; ulong privilege= lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL; - if (check_dependencies_in_with_clauses(lex->with_clauses_list)) - goto error; if (tables) { if (check_table_access(thd, privilege, tables, FALSE, UINT_MAX, FALSE)) @@ -1841,9 +1839,6 @@ static bool mysql_test_create_table(Prepared_statement *stmt) if (create_table_precheck(thd, tables, create_table)) DBUG_RETURN(TRUE); - if (check_dependencies_in_with_clauses(lex->with_clauses_list)) - DBUG_RETURN(TRUE); - if (select_lex->item_list.elements) { /* Base table and temporary table are not in the same name space. */ @@ -2234,9 +2229,6 @@ static bool mysql_test_insert_select(Prepared_statement *stmt, if (insert_precheck(stmt->thd, tables)) return 1; - if (check_dependencies_in_with_clauses(lex->with_clauses_list)) - return 1; - /* store it, because mysql_insert_select_prepare_tester change it */ first_local_table= lex->select_lex.table_list.first; DBUG_ASSERT(first_local_table != 0); @@ -2339,6 +2331,9 @@ static bool check_prepared_statement(Prepared_statement *stmt) if (tables) thd->get_stmt_da()->opt_clear_warning_info(thd->query_id); + if (check_dependencies_in_with_clauses(thd->lex->with_clauses_list)) + goto error; + if (sql_command_flags[sql_command] & CF_HA_CLOSE) mysql_ha_rm_tables(thd, tables);