• Sergey Petrunya's avatar
    SHOW EXPLAIN UPDATE/DELETE · 03691a77
    Sergey Petrunya authored
    - Introduce "Query Plan Footprints" (abbrev. QPFs)
      QPF is a part of query plan that is 
      1. sufficient to produce EXPLAIN output,
      2. can be used to produce EXPLAIN output even after its subquery/union
         was executed and deleted
      3. is cheap to save so that we can always save query plans
    
    - This patch doesn't fully address #2, we make/save strings for 
      a number of EXPLAIN's columns.  This will be fixed.
    
    03691a77
handler.h 116 KB