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MDEV-5535: Cannot reopen temporary table

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mysqld maintains a list of TABLE objects for all temporary
tables created within a session in THD. Here each table is
represented by a TABLE object.

A query referencing a particular temporary table for more
than once, however, failed with ER_CANT_REOPEN_TABLE error
because a TABLE_SHARE was allocate together with the TABLE,
so temporary tables always had only one TABLE per TABLE_SHARE.

This patch lift this restriction by separating TABLE and
TABLE_SHARE objects and storing TABLE_SHAREs for temporary
tables in a list in THD, and TABLEs in a list within their
respective TABLE_SHAREs.
This commit is contained in:
Nirbhay Choubey
2016-06-10 16:19:59 -04:00
parent 547511153f
commit 7305be2f7e
50 changed files with 2315 additions and 1260 deletions
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3
sql/sql_show.cc
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@ -4155,7 +4155,7 @@ fill_schema_table_by_open(THD *thd, bool is_show_fields_or_keys,
'only_view_structure()'.
*/
lex->sql_command= SQLCOM_SHOW_FIELDS;
result= (open_temporary_tables(thd, table_list) ||
result= (thd->open_temporary_tables(table_list) ||
open_normal_and_derived_tables(thd, table_list,
(MYSQL_OPEN_IGNORE_FLUSH |
MYSQL_OPEN_FORCE_SHARED_HIGH_PRIO_MDL |
@ -4218,6 +4218,7 @@ end:
all tables open within this Open_tables_state.
*/
thd->temporary_tables= NULL;
close_thread_tables(thd);
/*
Release metadata lock we might have acquired.