Semi-join optimizations code cleanup:

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- Break down POSITION/advance_sj_state() into four classes 
  representing potential semi-join strategies.

- Treat all strategies uniformly (before, DuplicateWeedout 
  was special as it was the catch-all strategy. Now, we're 
  still relying on it to be the catch-all, but are able to 
  function,e.g. with firstmatch=on,duplicate_weedout=off.

- Update test results (checked)

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This commit is contained in:

Sergey Petrunya

2011-11-23 04:25:52 +04:00

parent 7f746fbe74

commit 694ce95557

6 changed files with 780 additions and 489 deletions

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sql/opt_subselect.cc

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