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unknown d33ac37ba6 BUG#15935: In mysql_update, don't use full index scan when we could have used quick select scan.
mysql-test/r/update.result:
  Testcase for BUG#15935
mysql-test/t/update.test:
  Testcase for BUG#15935
sql/sql_update.cc:
  BUG#15935: 
  - Do account for the fact that used_index!=MAX_KEY is also true for cases
    when quick select is used, and use quick select then (and not full index scan).
  - Also removed the redundant "used_index= MAX_KEY" statement
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This is a release of MySQL, a dual-license SQL database server.
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  "Upgrading from..." section first!
- To see what MySQL can do, take a look at the features section.
- For installation instructions, see the Installation chapter.
- For future plans, see the TODO appendix.
- For the new features/bugfix history, see the News appendix.
- For the currently known bugs/misfeatures (known errors) see the problems
  appendix.
- For a list of developers and other contributors, see the Credits
  appendix.

A local copy of the MySQL Reference Manual can be found in the Docs
directory in GNU Info format.  You can also browse the manual online or
download it in any of several formats at the URL given earlier in this
file.

************************************************************

IMPORTANT:

Bug or error reports should be sent to http://bugs.mysql.com.
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