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Bug#20086: Can't get data from key partitioned tables with VARCHAR key

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The problem appeared because the same values produced different hash
during INSERT and SELECT for VARCHAR data type.
Fix:
VARCHAR required special treatment to avoid hashing of length bytes
(leftmost one or two bytes) as well as trailing bytes beyond real length,
which could contain garbage. Fix is done by introducing hash() - new method
in the Field class.


mysql-test/r/partition_innodb.result:
  Adding test case
mysql-test/r/partition_pruning.result:
  Fixing test results (results differ due to changes in hash function)
mysql-test/t/partition_innodb.test:
  Adding test case
sql/field.cc:
  Adding generic hash() method, and a special
  method for VARCHAR.
sql/field.h:
  Adding prototypes for new methods
sql/key.cc:
  Mark columns for write before executinf of set_key_image().
  Thanks for Mikael for suggesting this fix.
sql/sql_partition.cc:
  Removing old hash code.
  Using new methid field->hash() instead.
This commit is contained in:
unknown
2006-06-21 13:00:19 +05:00
parent 9addb8fd7b
commit 4e138572a0
7 changed files with 68 additions and 15 deletions
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17
sql/sql_partition.cc
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@@ -2103,26 +2103,15 @@ static inline longlong part_val_int(Item *item_expr)
static uint32 calculate_key_value(Field **field_array)
{
uint32 hashnr= 0;
ulong nr1= 1;
ulong nr2= 4;
do
{
Field *field= *field_array;
if (field->is_null())
{
hashnr^= (hashnr << 1) | 1;
}
else
{
uint len= field->pack_length();
ulong nr1= 1;
CHARSET_INFO *cs= field->charset();
cs->coll->hash_sort(cs, (uchar*)field->ptr, len, &nr1, &nr2);
hashnr^= (uint32)nr1;
}
field->hash(&nr1, &nr2);
} while (*(++field_array));
return hashnr;
return (uint32) nr1;
}