Bug #32858: Erro: "Incorrect usage of UNION and INTO" does not take

subselects into account
  
It is forbidden to use the SELECT INTO construction inside UNION statements
unless on the last SELECT of the union. The parser records whether it 
has seen INTO or not when parsing a UNION statement. But if the INTO was
legally used in an outer query, an error is thrown if UNION is seen in a
subquery. Fixed in 5.0 by remembering the nesting level of INTO tokens and 
mitigate the error unless it collides with the UNION.

1 files changed, 59 insertions, 0 deletions

diff --git a/mysql-test/t/union.test b/mysql-test/t/union.test
index 70789404d6e..f58cd54250b 100644
--- a/mysql-test/t/union.test
+++ b/mysql-test/t/union.test
@@ -91,6 +91,65 @@ SELECT @a:=1 UNION SELECT @a:=@a+1;
 (SELECT 1) UNION (SELECT 2) ORDER BY (SELECT a);
 (SELECT 1,3) UNION (SELECT 2,1) ORDER BY (SELECT 2);
 
+
+#
+# Bug#32858: Erro: "Incorrect usage of UNION and INTO" does not take subselects 
+# into account
+#
+CREATE TABLE t1 (a INT);
+INSERT INTO t1 VALUES (1);
+
+SELECT a INTO @v FROM (
+  SELECT a FROM t1
+  UNION
+  SELECT a FROM t1
+) alias;
+
+SELECT a INTO OUTFILE 'union.out.file' FROM (
+  SELECT a FROM t1
+  UNION
+  SELECT a FROM t1 WHERE 0
+) alias;
+
+SELECT a INTO DUMPFILE 'union.out.file2' FROM (
+  SELECT a FROM t1
+  UNION
+  SELECT a FROM t1 WHERE 0
+) alias;
+
+#
+# INTO will not be allowed in subqueries in version 5.1 and above.
+#
+SELECT a FROM (
+  SELECT a FROM t1
+  UNION
+  SELECT a INTO @v FROM t1
+) alias;
+
+SELECT a FROM (
+  SELECT a FROM t1
+  UNION
+  SELECT a INTO OUTFILE 'union.out.file3' FROM t1
+) alias;
+
+SELECT a FROM (
+  SELECT a FROM t1
+  UNION
+  SELECT a INTO DUMPFILE 'union.out.file4' FROM t1
+) alias;
+
+SELECT a FROM t1 UNION SELECT a INTO @v FROM t1;
+SELECT a FROM t1 UNION SELECT a INTO OUTFILE 'union.out.file5' FROM t1;
+SELECT a FROM t1 UNION SELECT a INTO OUTFILE 'union.out.file6' FROM t1;
+--error ER_WRONG_USAGE
+SELECT a INTO @v FROM t1 UNION SELECT a FROM t1;
+--error ER_WRONG_USAGE
+SELECT a INTO OUTFILE 'union.out.file7' FROM t1 UNION SELECT a FROM t1;
+--error ER_WRONG_USAGE
+SELECT a INTO DUMPFILE 'union.out.file8' FROM t1 UNION SELECT a FROM t1;
+
+DROP TABLE t1;
+
 #
 # Test bug reported by joc@presence-pc.com
 #