Commit 65b87b86 authored by anozdrin@mysql.com's avatar anozdrin@mysql.com
Browse files

Fix for BUG#18587: Function that accepts and returns TEXT 

garbles data if longer than 766 chars.

The problem is that a stored routine returns BLOBs to the previous
caller, BLOBs are shallow-copied (i.e. only pointers to the data are
copied). The fix is to also copy data of BLOBs.
parent 247be7d4

mysql-test/r/sp.result

+31 −0
Original line number Diff line number Diff line
@@ -4929,4 +4929,35 @@ j 
drop table t3|

drop view v1|

drop function bug12472|

DROP FUNCTION IF EXISTS bug18589_f1|

DROP PROCEDURE IF EXISTS bug18589_p1|

DROP PROCEDURE IF EXISTS bug18589_p2|

CREATE FUNCTION bug18589_f1(arg TEXT) RETURNS TEXT

BEGIN

RETURN CONCAT(arg, "");

END|

CREATE PROCEDURE bug18589_p1(arg TEXT, OUT ret TEXT)

BEGIN

SET ret = CONCAT(arg, "");

END|

CREATE PROCEDURE bug18589_p2(arg TEXT)

BEGIN

DECLARE v TEXT;

CALL bug18589_p1(arg, v);

SELECT v;

END|

SELECT bug18589_f1(REPEAT("a", 767))|

bug18589_f1(REPEAT("a", 767))

aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

SET @bug18589_v1 = ""|

CALL bug18589_p1(REPEAT("a", 767), @bug18589_v1)|

SELECT @bug18589_v1|

@bug18589_v1

aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

CALL bug18589_p2(REPEAT("a", 767))|

v

aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

DROP FUNCTION bug18589_f1|

DROP PROCEDURE bug18589_p1|

DROP PROCEDURE bug18589_p2|

drop table t1,t2;

mysql-test/t/sp.test

+47 −0
Original line number Diff line number Diff line
@@ -5796,6 +5796,53 @@ drop view v1| 
drop function bug12472|





#

# BUG#18587: Function that accepts and returns TEXT garbles data if longer than

# 766 chars

#



# Prepare.



--disable_warnings

DROP FUNCTION IF EXISTS bug18589_f1|

DROP PROCEDURE IF EXISTS bug18589_p1|

DROP PROCEDURE IF EXISTS bug18589_p2|

--enable_warnings



CREATE FUNCTION bug18589_f1(arg TEXT) RETURNS TEXT

BEGIN

  RETURN CONCAT(arg, "");

END|



CREATE PROCEDURE bug18589_p1(arg TEXT, OUT ret TEXT)

BEGIN

  SET ret = CONCAT(arg, "");

END|



CREATE PROCEDURE bug18589_p2(arg TEXT)

BEGIN

  DECLARE v TEXT;

  CALL bug18589_p1(arg, v);

  SELECT v;

END|



# Test case.



SELECT bug18589_f1(REPEAT("a", 767))|



SET @bug18589_v1 = ""|

CALL bug18589_p1(REPEAT("a", 767), @bug18589_v1)|

SELECT @bug18589_v1|



CALL bug18589_p2(REPEAT("a", 767))|



# Cleanup.



DROP FUNCTION bug18589_f1|

DROP PROCEDURE bug18589_p1|

DROP PROCEDURE bug18589_p2|





#

# BUG#NNNN: New bug synopsis

#

sql/field_conv.cc

+2 −1
Original line number Diff line number Diff line
@@ -642,7 +642,8 @@ void (*Copy_field::get_copy_func(Field *to,Field *from))(Copy_field*) 


void field_conv(Field *to,Field *from)

{

  if (to->real_type() == from->real_type())

  if (to->real_type() == from->real_type() &&

      !(to->type() == FIELD_TYPE_BLOB && to->table->copy_blobs))

  {

    if (to->pack_length() == from->pack_length() &&

        !(to->flags & UNSIGNED_FLAG && !(from->flags & UNSIGNED_FLAG)) &&

sql/item_func.cc

+1 −0
Original line number Diff line number Diff line
@@ -4735,6 +4735,7 @@ Item_func_sp::sp_result_field(void) const 
    dummy_table->alias = empty_name;

    dummy_table->maybe_null = maybe_null;

    dummy_table->in_use= current_thd;

    dummy_table->copy_blobs= TRUE;

    share->table_cache_key = empty_name;

    share->table_name = empty_name;

  }