Commit 95409456 authored by unknown's avatar unknown
Browse files

select.result, select.test: 

  Added a test case for bug #7520.
table.cc:
  Fixed bug #7520.
  The bug was caused by a wrong calculation of the field max_key_length for
  a TABLE structure when there was an index on a blob field.


sql/table.cc:
  Fixed bug #7520.
  The bug was caused by a wrong calculation of the field max_key_length for
  a TABLE structure when there was an index on a blob field.
mysql-test/t/select.test:
  Added a test case for bug #7520.
mysql-test/r/select.result:
  Added a test case for bug #7520.
parent 82de648b

mysql-test/r/select.result

+13 −0
Original line number Diff line number Diff line
@@ -2364,3 +2364,16 @@ EXPLAIN SELECT i FROM t1 WHERE i=1; 
table	type	possible_keys	key	key_len	ref	rows	Extra

t1	const	PRIMARY	PRIMARY	4	const	1	Using index

DROP TABLE t1;

CREATE TABLE t1 ( a BLOB, INDEX (a(20)) );

CREATE TABLE t2 ( a BLOB, INDEX (a(20)) );

INSERT INTO t1 VALUES ('one'),('two'),('three'),('four'),('five');

INSERT INTO t2 VALUES ('one'),('two'),('three'),('four'),('five');

EXPLAIN SELECT * FROM t1 LEFT JOIN t2 USE INDEX (a) ON t1.a=t2.a;

table	type	possible_keys	key	key_len	ref	rows	Extra

t1	ALL	NULL	NULL	NULL	NULL	5	

t2	ref	a	a	23	t1.a	5	

EXPLAIN SELECT * FROM t1 LEFT JOIN t2 FORCE INDEX (a) ON t1.a=t2.a;

table	type	possible_keys	key	key_len	ref	rows	Extra

t1	ALL	NULL	NULL	NULL	NULL	5	

t2	ref	a	a	23	t1.a	5	

DROP TABLE t1, t2;

mysql-test/t/select.test

+15 −0
Original line number Diff line number Diff line
@@ -1909,3 +1909,18 @@ EXPLAIN SELECT i FROM t1 WHERE i=1; 
EXPLAIN SELECT i FROM t1 WHERE i=1;



DROP TABLE t1;



#

# Test case for bug 7520: a wrong cost of the index for a BLOB field

#



CREATE TABLE t1 ( a BLOB, INDEX (a(20)) );

CREATE TABLE t2 ( a BLOB, INDEX (a(20)) );



INSERT INTO t1 VALUES ('one'),('two'),('three'),('four'),('five');

INSERT INTO t2 VALUES ('one'),('two'),('three'),('four'),('five');



EXPLAIN SELECT * FROM t1 LEFT JOIN t2 USE INDEX (a) ON t1.a=t2.a;

EXPLAIN SELECT * FROM t1 LEFT JOIN t2 FORCE INDEX (a) ON t1.a=t2.a;



DROP TABLE t1, t2;

sql/table.cc

+1 −0
Original line number Diff line number Diff line
@@ -486,6 +486,7 @@ int openfrm(const char *name, const char *alias, uint db_stat, uint prgflag, 
	    if (!(field->flags & BINARY_FLAG))

	      keyinfo->flags|= HA_END_SPACE_KEY;

	  }

          set_if_bigger(outparam->max_key_length, keyinfo->key_length);

	  if (i == 0 && key != primary_key)

	    field->flags |=

	      ((keyinfo->flags & HA_NOSAME) &&