database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2026-01-06 05:22:24 +03:00
Code Activity

New handler::index_flags() definition to make it easy to check the full used key and a specific key part.

Browse Source 
Added key part to optimize_range() to fix problems when using fields in key parts.
This commit is contained in:
monty@mysql.com
2004-07-08 15:45:25 +03:00
parent 6fdafa5635
commit db7efa2780
25 changed files with 83 additions and 56 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
sql/sql_select.cc
View File

@@ -2825,7 +2825,7 @@ find_best(JOIN *join,table_map rest_tables,uint idx,double record_count,
Set tmp to (previous record count) * (records / combination)
*/
if ((found_part & 1) &&
(!(table->file->index_flags(key,0) & HA_ONLY_WHOLE_INDEX) ||
(!(table->file->index_flags(key,0,0) & HA_ONLY_WHOLE_INDEX) ||
found_part == PREV_BITS(uint,keyinfo->key_parts)))
{
max_key_part=max_part_bit(found_part);
@@ -7172,7 +7172,7 @@ test_if_skip_sort_order(JOIN_TAB *tab,ORDER *order,ha_rows select_limit,
if (!select->quick->reverse_sorted())
{
// here used_key_parts >0
if (!(table->file->index_flags(ref_key,used_key_parts-1)
if (!(table->file->index_flags(ref_key,used_key_parts-1, 1)
& HA_READ_PREV))
DBUG_RETURN(0); // Use filesort
// ORDER BY range_key DESC
@@ -7195,9 +7195,9 @@ test_if_skip_sort_order(JOIN_TAB *tab,ORDER *order,ha_rows select_limit,
Use a traversal function that starts by reading the last row
with key part (A) and then traverse the index backwards.
*/
if (!(table->file->index_flags(ref_key,used_key_parts-1)
& HA_READ_PREV))
DBUG_RETURN(0); // Use filesort
if (!(table->file->index_flags(ref_key,used_key_parts-1, 1)
& HA_READ_PREV))
DBUG_RETURN(0); // Use filesort
tab->read_first_record= join_read_last_key;
tab->read_record.read_record= join_read_prev_same;
/* fall through */