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Fix for bug#51304: checksum table gives different results

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for same data when using bit fields

Problem: checksum for BIT fields may be computed incorrectly 
in some cases due to its storage peculiarity.

Fix: convert a BIT field to a string then calculate its checksum.
This commit is contained in:
Ramil Kalimullin
2010-02-28 21:29:19 +04:00
parent 51d54a7eca
commit c1de4070ca
3 changed files with 54 additions and 16 deletions
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36
sql/sql_table.cc
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@ -7934,22 +7934,28 @@ bool mysql_checksum_table(THD *thd, TABLE_LIST *tables,
for (uint i= 0; i < t->s->fields; i++ )
{
Field *f= t->field[i];
enum_field_types field_type= f->type();
/*
BLOB and VARCHAR have pointers in their field, we must convert
to string; GEOMETRY is implemented on top of BLOB.
*/
if ((field_type == MYSQL_TYPE_BLOB) ||
(field_type == MYSQL_TYPE_VARCHAR) ||
(field_type == MYSQL_TYPE_GEOMETRY))
{
String tmp;
f->val_str(&tmp);
row_crc= my_checksum(row_crc, (uchar*) tmp.ptr(), tmp.length());
/*
BLOB and VARCHAR have pointers in their field, we must convert
to string; GEOMETRY is implemented on top of BLOB.
BIT may store its data among NULL bits, convert as well.
*/
switch (f->type()) {
case MYSQL_TYPE_BLOB:
case MYSQL_TYPE_VARCHAR:
case MYSQL_TYPE_GEOMETRY:
case MYSQL_TYPE_BIT:
{
String tmp;
f->val_str(&tmp);
row_crc= my_checksum(row_crc, (uchar*) tmp.ptr(),
tmp.length());
break;
}
default:
row_crc= my_checksum(row_crc, f->ptr, f->pack_length());
break;
}
else
row_crc= my_checksum(row_crc, f->ptr,
f->pack_length());
}
crc+= row_crc;