BUG#26325 - TEMPORARY TABLE "corrupt" after first read, according

            to CHECK TABLE

CHECK/REPAIR TABLE reports "File not found" error when issued
against temporary table.

Fixed by disabling a brunch of code (in case it gets temporary table)
that is responsible for updating frm version as it is not needed
for temporary tables.

mysql-test/r/check.result

@@ -14,3 +14,11 @@ test.v1	check	status	OK
 test.t2	check	status	OK
 drop view v1;
 drop table t1, t2;
+CREATE TEMPORARY TABLE t1(a INT);
+CHECK TABLE t1;
+Table	Op	Msg_type	Msg_text
+test.t1	check	status	OK
+REPAIR TABLE t1;
+Table	Op	Msg_type	Msg_text
+test.t1	repair	status	OK
+DROP TABLE t1;

mysql-test/t/check.test

@@ -36,3 +36,12 @@ Create view v1 as Select * from t1;
 Check Table v1,t2;
 drop view v1;
 drop table t1, t2;
+
+#
+# BUG#26325 - TEMPORARY TABLE "corrupt" after first read, according to CHECK
+#             TABLE
+#
+CREATE TEMPORARY TABLE t1(a INT);
+CHECK TABLE t1;
+REPAIR TABLE t1;
+DROP TABLE t1;

sql/handler.cc

@@ -1997,7 +1997,13 @@ static bool update_frm_version(TABLE *table, bool needs_lock)
   int result= 1;
   DBUG_ENTER("update_frm_version");
 
-  if (table->s->mysql_version != MYSQL_VERSION_ID)
+  /*
+    No need to update frm version in case table was created or checked
+    by server with the same version. This also ensures that we do not
+    update frm version for temporary tables as this code doesn't support
+    temporary tables.
+  */
+  if (table->s->mysql_version == MYSQL_VERSION_ID)
     DBUG_RETURN(0);
 
   strxnmov(path, sizeof(path)-1, mysql_data_home, "/", table->s->db, "/",