Bug #21143080: UPDATE ON VARCHAR AND TEXT COLUMNS PRODUCE
INCORRECT RESULTS Issue: ----- Updating varchar and text fields in the same update statement can produce incorrect results. When a varchar field is assigned to the text field and the varchar field is then set to a different value, the text field's result contains the varchar field's new value. SOLUTION: --------- Currently the blob type does not allocate space for the string to be stored. Instead it contains a pointer to the varchar string. So when the varchar field is changed as part of the update statement, the value contained in the blob also changes. The fix would be to actually store the value by allocating space for the blob's string. We can avoid allocating this space when the varchar field is not being written into.
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@ -551,3 +551,16 @@ ERROR HY000: View 'test.v1' references invalid table(s) or column(s) or function
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DROP VIEW v1;
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DROP FUNCTION f1;
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DROP TABLE t1;
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# Bug #21143080: UPDATE ON VARCHAR AND TEXT COLUMNS PRODUCE INCORRECT
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# RESULTS
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CREATE TABLE t1 (a VARCHAR(50), b TEXT, c CHAR(50)) ENGINE=INNODB;
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INSERT INTO t1 (a, b, c) VALUES ('start trail', '', 'even longer string');
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UPDATE t1 SET b = a, a = 'inject';
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SELECT a, b FROM t1;
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a b
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inject start trail
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UPDATE t1 SET b = c, c = 'inject';
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SELECT c, b FROM t1;
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c b
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inject even longer string
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DROP TABLE t1;
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@ -503,3 +503,16 @@ UPDATE v1 SET pk = 7 WHERE pk > 0;
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DROP VIEW v1;
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DROP FUNCTION f1;
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DROP TABLE t1;
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--echo # Bug #21143080: UPDATE ON VARCHAR AND TEXT COLUMNS PRODUCE INCORRECT
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--echo # RESULTS
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CREATE TABLE t1 (a VARCHAR(50), b TEXT, c CHAR(50)) ENGINE=INNODB;
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INSERT INTO t1 (a, b, c) VALUES ('start trail', '', 'even longer string');
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UPDATE t1 SET b = a, a = 'inject';
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SELECT a, b FROM t1;
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UPDATE t1 SET b = c, c = 'inject';
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SELECT c, b FROM t1;
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DROP TABLE t1;
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18
sql/field.h
18
sql/field.h
@ -1,7 +1,7 @@
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#ifndef FIELD_INCLUDED
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#define FIELD_INCLUDED
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/* Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
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/* Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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@ -511,6 +511,17 @@ public:
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}
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/* Hash value */
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virtual void hash(ulong *nr, ulong *nr2);
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/**
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Checks whether a string field is part of write_set.
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@return
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FALSE - If field is not char/varchar/....
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- If field is char/varchar/.. and is not part of write set.
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TRUE - If field is char/varchar/.. and is part of write set.
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*/
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virtual bool is_updatable() const { return FALSE; }
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friend int cre_myisam(char * name, register TABLE *form, uint options,
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ulonglong auto_increment_value);
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friend class Copy_field;
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@ -798,6 +809,11 @@ public:
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int store_decimal(const my_decimal *d);
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uint32 max_data_length() const;
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bool is_updatable() const
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{
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DBUG_ASSERT(table && table->write_set);
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return bitmap_is_set(table->write_set, field_index);
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}
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};
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/* base class for float and double and decimal (old one) */
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@ -1,4 +1,4 @@
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/* Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
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/* Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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@ -800,15 +800,10 @@ int field_conv(Field *to,Field *from)
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{ // Be sure the value is stored
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Field_blob *blob=(Field_blob*) to;
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from->val_str(&blob->value);
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/*
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Copy value if copy_blobs is set, or source is not a string and
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we have a pointer to its internal string conversion buffer.
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*/
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if (to->table->copy_blobs ||
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(!blob->value.is_alloced() &&
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from->real_type() != MYSQL_TYPE_STRING &&
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from->real_type() != MYSQL_TYPE_VARCHAR))
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if (!blob->value.is_alloced() && from->is_updatable())
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blob->value.copy();
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return blob->store(blob->value.ptr(),blob->value.length(),from->charset());
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}
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if (from->real_type() == MYSQL_TYPE_ENUM &&
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