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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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7
mysql-test/suite/handler/handler.inc
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@@ -460,9 +460,6 @@ drop table t1;
#
# Bug#30882 Dropping a temporary table inside a stored function may cause a server crash
#
# Test HANDLER statements in conjunction with temporary tables. While the temporary table
# is open by a HANDLER, no other statement can access it.
#
create temporary table t1 (a int, b char(1), key a using btree (a), key b using btree (a,b));
insert into t1 values (0,"a"),(1,"b"),(2,"c"),(3,"d"),(4,"e"),
@@ -472,7 +469,6 @@ handler t1 open as a1;
handler a1 read a=(1);
handler a1 read a next;
handler a1 read a next;
--error ER_CANT_REOPEN_TABLE
select a,b from t1;
handler a1 read a prev;
handler a1 read a prev;
@@ -564,7 +560,7 @@ handler t1 open;
handler t1 read next;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
handler t2 close;
--error ER_CANT_REOPEN_TABLE
--error ER_LOCK_OR_ACTIVE_TRANSACTION
handler t3 open;
--echo # After UNLOCK TABLES handlers should be around and
--echo # we should be able to continue reading through them.
@@ -1182,7 +1178,6 @@ handler t1 read a next;
select * from t1;
--echo # Sic: the position is not lost
handler t2 read a next;
--error ER_CANT_REOPEN_TABLE
select * from t2;
handler t2 read a next;
drop table t1;