Bug#48800 CREATE TABLE t...SELECT fails if t is a temporary

          table

If a temporary table A exists, and a (permanent) table 
with the same name is attempted created with 
"CREATE TABLE ... AS SELECT", the create would fail with 
an error.
   1050: Table 'A' already exists

The error occured in MySQL 5.1 releases, but is not
present in MySQL 5.5.   This patch adds a regression
test to ensure that the problem does not reoccur.

mysql-test/r/create.result

@@ -1977,3 +1977,18 @@ CREATE TABLE t1 LIKE t2;
 ERROR 42S01: Table 't1' already exists
 DROP TABLE t2;
 DROP TABLE t1;
+#
+# Bug #48800 CREATE TABLE t...SELECT fails if t is a 
+#            temporary table
+#
+CREATE TEMPORARY TABLE t1 (a INT);
+CREATE TABLE t1 (a INT);
+CREATE TEMPORARY TABLE t2 (a INT);
+CREATE VIEW t2 AS SELECT 1;
+CREATE TABLE t3 (a INT);
+CREATE TEMPORARY TABLE t3 SELECT 1;
+CREATE TEMPORARY TABLE t4 (a INT);
+CREATE TABLE t4 AS SELECT 1;
+DROP TEMPORARY TABLE t1, t2, t3, t4;
+DROP TABLE t1, t3, t4;
+DROP VIEW t2;

mysql-test/t/create.test

@@ -1668,3 +1668,25 @@ CREATE TABLE t1 LIKE t2;
 
 DROP TABLE t2;
 DROP TABLE t1;
+
+--echo #
+--echo # Bug #48800 CREATE TABLE t...SELECT fails if t is a 
+--echo #            temporary table
+--echo #
+
+CREATE TEMPORARY TABLE t1 (a INT);
+CREATE TABLE t1 (a INT);
+
+CREATE TEMPORARY TABLE t2 (a INT);
+CREATE VIEW t2 AS SELECT 1;
+
+CREATE TABLE t3 (a INT);
+CREATE TEMPORARY TABLE t3 SELECT 1; 
+
+CREATE TEMPORARY TABLE t4 (a INT);
+CREATE TABLE t4 AS SELECT 1;
+
+DROP TEMPORARY TABLE t1, t2, t3, t4;
+DROP TABLE t1, t3, t4;
+DROP VIEW t2;
+