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Merge with 4.0

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This commit is contained in:
monty@mashka.mysql.fi
2002-11-21 15:56:48 +02:00
parent 305d16a7cb e60050c4dd
commit dac6498f9b
300 changed files with 7665 additions and 2426 deletions
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59
sql/opt_range.cc
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@ -2463,9 +2463,9 @@ int QUICK_SELECT::get_next()
if (range->flag & NO_MIN_RANGE) // Read first record
{
int error;
if ((error=file->index_first(record)))
DBUG_RETURN(error); // Empty table
int local_error;
if ((local_error=file->index_first(record)))
DBUG_RETURN(local_error); // Empty table
if (cmp_next(range) == 0)
DBUG_RETURN(0);
range=0; // No matching records; go to next range
@ -2499,13 +2499,13 @@ int QUICK_SELECT::get_next()
/* compare if found key is over max-value */
/* Returns 0 if key <= range->max_key */
int QUICK_SELECT::cmp_next(QUICK_RANGE *range)
int QUICK_SELECT::cmp_next(QUICK_RANGE *range_arg)
{
if (range->flag & NO_MAX_RANGE)
return (0); /* key can't be to large */
if (range_arg->flag & NO_MAX_RANGE)
return 0; /* key can't be to large */
KEY_PART *key_part=key_parts;
for (char *key=range->max_key, *end=key+range->max_length;
for (char *key=range_arg->max_key, *end=key+range_arg->max_length;
key < end;
key+= key_part++->part_length)
{
@ -2526,7 +2526,7 @@ int QUICK_SELECT::cmp_next(QUICK_RANGE *range)
if (cmp > 0)
return 1;
}
return (range->flag & NEAR_MAX) ? 1 : 0; // Exact match
return (range_arg->flag & NEAR_MAX) ? 1 : 0; // Exact match
}
@ -2610,9 +2610,9 @@ int QUICK_SELECT_DESC::get_next()
if (range->flag & NO_MAX_RANGE) // Read last record
{
int error;
if ((error=file->index_last(record)))
DBUG_RETURN(error); // Empty table
int local_error;
if ((local_error=file->index_last(record)))
DBUG_RETURN(local_error); // Empty table
if (cmp_prev(range) == 0)
DBUG_RETURN(0);
range=0; // No matching records; go to next range
@ -2666,16 +2666,18 @@ int QUICK_SELECT_DESC::get_next()
}
}
/*
* Returns 0 if found key is inside range (found key >= range->min_key).
*/
int QUICK_SELECT_DESC::cmp_prev(QUICK_RANGE *range)
Returns 0 if found key is inside range (found key >= range->min_key).
*/
int QUICK_SELECT_DESC::cmp_prev(QUICK_RANGE *range_arg)
{
if (range->flag & NO_MIN_RANGE)
return (0); /* key can't be to small */
if (range_arg->flag & NO_MIN_RANGE)
return 0; /* key can't be to small */
KEY_PART *key_part = key_parts;
for (char *key = range->min_key, *end = key + range->min_length;
for (char *key = range_arg->min_key, *end = key + range_arg->min_length;
key < end;
key += key_part++->part_length)
{
@ -2699,42 +2701,45 @@ int QUICK_SELECT_DESC::cmp_prev(QUICK_RANGE *range)
if (cmp < 0)
return 1;
}
return (range->flag & NEAR_MIN) ? 1 : 0; // Exact match
return (range_arg->flag & NEAR_MIN) ? 1 : 0; // Exact match
}
/*
* True if this range will require using HA_READ_AFTER_KEY
See comment in get_next() about this
*/
bool QUICK_SELECT_DESC::range_reads_after_key(QUICK_RANGE *range)
bool QUICK_SELECT_DESC::range_reads_after_key(QUICK_RANGE *range_arg)
{
return ((range->flag & (NO_MAX_RANGE | NEAR_MAX)) ||
!(range->flag & EQ_RANGE) ||
head->key_info[index].key_length != range->max_length) ? 1 : 0;
return ((range_arg->flag & (NO_MAX_RANGE | NEAR_MAX)) ||
!(range_arg->flag & EQ_RANGE) ||
head->key_info[index].key_length != range_arg->max_length) ? 1 : 0;
}
/* True if we are reading over a key that may have a NULL value */
bool QUICK_SELECT_DESC::test_if_null_range(QUICK_RANGE *range,
bool QUICK_SELECT_DESC::test_if_null_range(QUICK_RANGE *range_arg,
uint used_key_parts)
{
uint offset,end;
KEY_PART *key_part = key_parts,
*key_part_end= key_part+used_key_parts;
for (offset= 0, end = min(range->min_length, range->max_length) ;
for (offset= 0, end = min(range_arg->min_length, range_arg->max_length) ;
offset < end && key_part != key_part_end ;
offset += key_part++->part_length)
{
uint null_length=test(key_part->null_bit);
if (!memcmp((char*) range->min_key+offset, (char*) range->max_key+offset,
if (!memcmp((char*) range_arg->min_key+offset,
(char*) range_arg->max_key+offset,
key_part->part_length + null_length))
{
offset+=null_length;
continue;
}
if (null_length && range->min_key[offset])
if (null_length && range_arg->min_key[offset])
return 1; // min_key is null and max_key isn't
// Range doesn't cover NULL. This is ok if there is no more null parts
break;
@ -2747,7 +2752,7 @@ bool QUICK_SELECT_DESC::test_if_null_range(QUICK_RANGE *range,
*/
if (key_part != key_part_end && key_part->null_bit)
{
if (offset >= range->min_length || range->min_key[offset])
if (offset >= range_arg->min_length || range_arg->min_key[offset])
return 1; // Could be null
key_part++;
}