1. 19 Oct, 2006 2 commits
  2. 18 Oct, 2006 1 commit
  3. 17 Oct, 2006 9 commits
  4. 16 Oct, 2006 8 commits
    • igor@rurik.mysql.com's avatar
      Fixed bug #19579: at range analysis optimizer did not take into · c467be8d
      igor@rurik.mysql.com authored
      account predicates that become sargable after reading const tables.
      In some cases this resulted in choosing non-optimal execution plans.
      Now info of such potentially saragable predicates is saved in
      an array and after reading const tables we check whether this
      predicates has become saragable.
      c467be8d
    • gkodinov/kgeorge@rakia.(none)'s avatar
      Merge gkodinov@bk-internal.mysql.com:/home/bk/mysql-5.0-opt · a5899ea8
      gkodinov/kgeorge@rakia.(none) authored
      into  rakia.(none):/home/kgeorge/mysql/autopush/B22342-5.0-opt
      a5899ea8
    • gkodinov/kgeorge@macbook.gmz's avatar
      Bug #22342: No results returned for query using max and group by · 0e954d2c
      gkodinov/kgeorge@macbook.gmz authored
       When using index for group by and range access the server isolates    
       a set of ranges based on the conditions over the key parts of the
       index used. Then it uses only the ranges over the GROUP BY fields to
       jump from one group to another. Since the GROUP BY fields may form a
       prefix over the index, we may use only a prefix of the ranges produced
       by the range optimizer.
       Each range contains a notion on whether it includes its border values.
       The problem is that when using a range prefix, the last range is open
       because it assumes that there is a range on the next keypart. Thus when
       we use a prefix range as it is, it excludes all border values.
       The solution is when ignoring the suffix of the range conditions 
       (to jump over the GROUP BY prefix only) the server must change the 
       remaining intervals so they always contain their borders, e.g. 
       if the whole range was :
       (1,-inf) <= (<group_by_col>,<min_max_arg_col>) < (1, 3) we must make
       (1) <= (<group_by_col>) <= (1) because (a,b) < (c1,c2) means :
       a < c1 OR (a = c1 AND b < c2).
      0e954d2c
    • gkodinov/kgeorge@macbook.gmz's avatar
      Bug #22367: Optimizer uses ref join type instead of eq_ref for simple join on · a1310d84
      gkodinov/kgeorge@macbook.gmz authored
                   strings
      MySQL is setting the flag HA_END_SPACE_KEYS for all the keys that reference
      text or varchar columns with collation different than binary.
      This was done to handle correctly the situation where a lookup on such a key
      may return more than 1 row because of the presence of many rows that differ
      only by the amount of trailing space in the table's string column.
      Inserting such values however appears to violate the unique checks on 
      INSERT/UPDATE. Thus that flag must not be set as it will prevent the optimizer
      from choosing a faster access method.
      This fix removes the setting of the HA_END_SPACE_KEYS flag.
      a1310d84
    • gkodinov/kgeorge@macbook.gmz's avatar
      Merge bk-internal:/home/bk/mysql-5.0-opt · abad78f4
      gkodinov/kgeorge@macbook.gmz authored
      into  macbook.gmz:/Users/kgeorge/mysql/work/B14019-5.0-opt
      abad78f4
    • gkodinov/kgeorge@macbook.gmz's avatar
    • gkodinov/kgeorge@macbook.gmz's avatar
      Merge macbook.gmz:/Users/kgeorge/mysql/work/B14019-4.1-opt · dff0a1ac
      gkodinov/kgeorge@macbook.gmz authored
      into  macbook.gmz:/Users/kgeorge/mysql/work/B14019-5.0-opt
      dff0a1ac
    • gkodinov/kgeorge@macbook.gmz's avatar
      BUG#14019 : group by converts literal string to column name · 11561638
      gkodinov/kgeorge@macbook.gmz authored
         When resolving unqualified name references MySQL was not
         checking what is the item type for the reference. Thus
         e.g a string literal item that has by convention a name
         equal to its string value will also work as a reference to 
         a SELECT list item or a table field.
         Fixed by allowing only Item_ref or Item_field to referenced by
         (unqualified) name.
      11561638
  5. 13 Oct, 2006 3 commits
  6. 12 Oct, 2006 1 commit
  7. 11 Oct, 2006 3 commits
  8. 10 Oct, 2006 3 commits
  9. 09 Oct, 2006 2 commits
    • gkodinov/kgeorge@macbook.local's avatar
      Merge bk-internal:/home/bk/mysql-5.0-opt · 5367793e
      gkodinov/kgeorge@macbook.local authored
      into  macbook.local:/Users/kgeorge/mysql/work/B22781-5.0-opt
      5367793e
    • gkodinov/kgeorge@macbook.local's avatar
      Bug #22781: SQL_BIG_RESULT fails to influence sort plan · 13633864
      gkodinov/kgeorge@macbook.local authored
       Currently SQL_BIG_RESULT is checked only at compile time.
       However, additional optimizations may take place after
       this check that change the sort method from 'filesort'
       to sorting via index. As a result the actual plan
       executed is not the one specified by the SQL_BIG_RESULT
       hint. Similarly, there is no such test when executing
       EXPLAIN, resulting in incorrect output.
       The patch corrects the problem by testing for
       SQL_BIG_RESULT both during the explain and execution
       phases.
      13633864
  10. 08 Oct, 2006 4 commits
  11. 06 Oct, 2006 4 commits