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Bug#47925: regression of range optimizer and date comparison in 5.1.39!

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When a query was using a DATE or DATETIME value formatted
using any other separator characters beside hyphen '-', a
query with a greater-or-equal '>=' condition matching only
the greatest value in an indexed column, the result was
empty if index range scan was employed.

The range optimizer got a new feature between 5.1.38 and
5.1.39 that changes a greater-or-equal condition to a
greater-than if the value matching that in the query was not
present in the table. But the value comparison function
compared the dates as strings instead of dates.

The bug was fixed by splitting the function
get_date_from_str in two: One part that parses and does
error checking. This function is now visible outside the
module. The old get_date_from_str now calls the new
function.


mysql-test/r/range.result:
  Bug#47925: Test result
mysql-test/t/range.test:
  Bug#47925: Test case
sql/item.cc:
  Bug#47925: Fix + some edit on the comments
sql/item.h:
  Bug#47925: Changed function signature
sql/item_cmpfunc.cc:
  Bug#47925: Split function in two
sql/item_cmpfunc.h:
  Bug#47925: Declaration of new function
sql/opt_range.cc:
  Bug#47925: Added THD to function call
sql/time.cc:
  Bug#47925: Added microsecond comparison
This commit is contained in:
Martin Hansson
2009-11-02 13:24:07 +01:00
parent 1955c86624
commit 740b7c4e36
8 changed files with 390 additions and 94 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
sql/opt_range.cc
View File

@ -5968,7 +5968,7 @@ get_mm_leaf(RANGE_OPT_PARAM *param, COND *conf_func, Field *field,
switch (type) {
case Item_func::LT_FUNC:
if (stored_field_cmp_to_item(field,value) == 0)
if (stored_field_cmp_to_item(param->thd, field, value) == 0)
tree->max_flag=NEAR_MAX;
/* fall through */
case Item_func::LE_FUNC:
@ -5983,14 +5983,14 @@ get_mm_leaf(RANGE_OPT_PARAM *param, COND *conf_func, Field *field,
case Item_func::GT_FUNC:
/* Don't use open ranges for partial key_segments */
if ((!(key_part->flag & HA_PART_KEY_SEG)) &&
(stored_field_cmp_to_item(field, value) <= 0))
(stored_field_cmp_to_item(param->thd, field, value) <= 0))
tree->min_flag=NEAR_MIN;
tree->max_flag= NO_MAX_RANGE;
break;
case Item_func::GE_FUNC:
/* Don't use open ranges for partial key_segments */
if ((!(key_part->flag & HA_PART_KEY_SEG)) &&
(stored_field_cmp_to_item(field,value) < 0))
(stored_field_cmp_to_item(param->thd, field, value) < 0))
tree->min_flag= NEAR_MIN;
tree->max_flag=NO_MAX_RANGE;
break;