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MDEV-7899: 10.1 is 3% slower than 10.0 in OLTP RO

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- Remove ANALYZE's timing code off the the execution path of regular
  SELECTs.
- Improve the tracker that tracks counts/execution times of SELECTs or
  DML statements:
  = regular execution just increments counters
  = ANALYZE will also collect timings.
This commit is contained in:
Sergei Petrunia 2015-04-07 01:29:17 +03:00
commit 2af935c8ec
10 changed files with 105 additions and 70 deletions
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sql/sql_select.h
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@ -1282,7 +1282,7 @@ public:
bool optimized; ///< flag to avoid double optimization in EXPLAIN
bool initialized; ///< flag to avoid double init_execution calls
Exec_time_tracker *tracker;
Time_and_counter_tracker *tracker;
enum { QEP_NOT_PRESENT_YET, QEP_AVAILABLE, QEP_DELETED} have_query_plan;