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Manually merged

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evgen@moonbone.local
2006-06-18 14:56:35 +04:00
parent 8c4206a31d 09e84bf484
commit 79c91f6214
51 changed files with 1061 additions and 231 deletions
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15
sql/opt_sum.cc
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@ -651,7 +651,8 @@ static bool matching_cond(bool max_fl, TABLE_REF *ref, KEY *keyinfo,
}
else
{
store_val_in_field(part->field, args[between && max_fl ? 2 : 1]);
store_val_in_field(part->field, args[between && max_fl ? 2 : 1],
CHECK_FIELD_IGNORE);
if (part->null_bit)
*key_ptr++= (byte) test(part->field->is_null());
part->field->get_key_image((char*) key_ptr, part->length, Field::itRAW);
@ -706,6 +707,8 @@ static bool matching_cond(bool max_fl, TABLE_REF *ref, KEY *keyinfo,
field BETWEEN const1 AND const2
3. all references to the columns from the same table as column field
occur only in conjucts mentioned above.
4. each of k first components the index is not partial, i.e. is not
defined on a fixed length proper prefix of the field.
If such an index exists the function through the ref parameter
returns the key value to find max/min for the field using the index,
@ -715,8 +718,8 @@ static bool matching_cond(bool max_fl, TABLE_REF *ref, KEY *keyinfo,
of the whole search key)
NOTE
This function may set table->key_read to 1, which must be reset after
index is used! (This can only happen when function returns 1)
This function may set table->key_read to 1, which must be reset after
index is used! (This can only happen when function returns 1)
RETURN
0 Index can not be used to optimize MIN(field)/MAX(field)
@ -750,6 +753,12 @@ static bool find_key_for_maxmin(bool max_fl, TABLE_REF *ref,
if (!(table->file->index_flags(idx, jdx, 0) & HA_READ_ORDER))
return 0;
/* Check whether the index component is partial */
Field *part_field= table->field[part->fieldnr-1];
if ((part_field->flags & BLOB_FLAG) ||
part->length < part_field->key_length())
break;
if (field->eq(part->field))
{
ref->key= idx;