TEMPORARY PUSH: Changing all cost calculation to be given in ms10.7-selectivity-old

- Added tests/check_costs.pl, a tool to verify optimizer cost calculations.
  - Most costs has been found with this program. All steps to calculate
    the new costs are documented in Docs/optimizer.costs
- User optimizer_cost variables are given in usec (as individual
  costs can be very small). Internally they are stored in ms.
- Changed DISK_READ_COST (was DISK_SEEK_BASE_COST) from a hard disk cost
  (9 ms) to common SSD cost (400MB/sec).
- Changed the following handler functions to return IO_AND_CPU_COST.
  This makes it easy to apply different cost modifiers in ha_..time()
  functions for io and cpu costs.
  - scan_time()
  - rndpos_time()
  - keyread_time()
- Enhanched keyread_time() to calculate the full cost of reading of a set
  of keys with a given number of ranges and optionall number of blocks that
  need to be accessed.
- Removed read_time() as keyread_time() + rndpos_time() is the same thing.
- Added the following new optimizer_variables:
  - optimizer_scan_lookup_cost
  - optimizer_row_lookup_cost
  - optimizer_index_lookup_cost
  - optimizer_disk_read_cost
- Added include/my_tracker.h  ; Useful include file to quickly test costs
  of a function.
- Tuned sequence and heap engine costs (rest will be done in an updated
  commit)

1 files changed, 2 insertions, 0 deletions

diff --git a/sql/sql_join_cache.cc b/sql/sql_join_cache.cc
index 1347e38753d..5fcfe0e0e0a 100644
--- a/sql/sql_join_cache.cc
+++ b/sql/sql_join_cache.cc
@@ -1600,6 +1600,7 @@ bool JOIN_CACHE::put_record()
 bool JOIN_CACHE::get_record()
 { 
   bool res;
+  ANALYZE_START_TRACKING(thd(), join_tab->jbuf_unpack_tracker);
   uchar *prev_rec_ptr= 0;
   if (with_length)
     pos+= size_of_rec_len;
@@ -1615,6 +1616,7 @@ bool JOIN_CACHE::get_record()
     if (prev_cache)
       prev_cache->get_record_by_pos(prev_rec_ptr);
   } 
+  ANALYZE_STOP_TRACKING(thd(), join_tab->jbuf_unpack_tracker);
   return res; 
 }