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Original idea from Zardosht Kasheff to add HA_CLUSTERED_INDEX

Browse source 
- Added a lot of code comments
- Updated get_best_ror_intersec() to prefer index scan on not clustered keys before clustered keys.
- Use HA_CLUSTERED_INDEX to define if one should use HA_MRR_INDEX_ONLY
- For test of using index or filesort to resolve ORDER BY, use HA_CLUSTERED_INDEX flag instead of primary_key_is_clustered()
- Use HA_TABLE_SCAN_ON_INDEX instead of primary_key_is_clustered() to decide if ALTER TABLE ... ORDER BY will have any effect.

sql/ha_partition.h:
  Added comment with warning for code unsafe to use with multiple storage engines at the same time
sql/handler.h:
  Added HA_CLUSTERED_INDEX.
  Documented primary_key_is_clustered()
sql/opt_range.cc:
  Added code comments
  Updated get_best_ror_intersec() to ignore clustered keys.
  Optimized away cpk_scan_used and one instance of current_thd (Simpler code)
  Use HA_CLUSTERED_INDEX to define if one should use HA_MRR_INDEX_ONLY
sql/sql_select.cc:
  Changed comment to #ifdef
  For test of using index or filesort to resolve ORDER BY, use HA_CLUSTERED_INDEX flag instead of primary_key_is_clustered()
  (Change is smaller than what it looks beause of indentation change)
sql/sql_table.cc:
  Use HA_TABLE_SCAN_ON_INDEX instead of primary_key_is_clustered() to decide if ALTER TABLE ... ORDER BY will have any effect.
storage/innobase/handler/ha_innodb.h:
  Added support for HA_CLUSTERED_INDEX
storage/innodb_plugin/handler/ha_innodb.cc:
  Added support for HA_CLUSTERED_INDEX
storage/xtradb/handler/ha_innodb.cc:
  Added support for HA_CLUSTERED_INDEX
This commit is contained in:
Michael Widenius 2011-05-18 19:26:30 +03:00
commit 3631146442
8 changed files with 123 additions and 63 deletions
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7
storage/innodb_plugin/handler/ha_innodb.cc
View file

@ -2995,12 +2995,15 @@ UNIV_INTERN
ulong
ha_innobase::index_flags(
/*=====================*/
uint,
uint index,
uint,
bool)
const
{
return(HA_READ_NEXT | HA_READ_PREV | HA_READ_ORDER
ulong extra_flag= 0;
if (table && index == table->s->primary_key)
extra_flag= HA_CLUSTERED_INDEX;
return(HA_READ_NEXT | HA_READ_PREV | HA_READ_ORDER | extra_flag
| HA_READ_RANGE | HA_KEYREAD_ONLY);
}