[Hadoop Wiki] Update of "Hive/DeveloperGuide" by ZhengShao

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The following page has been changed by ZhengShao:
http://wiki.apache.org/hadoop/Hive/DeveloperGuide

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   * {{{build/ql/test/logs/groupby1.q.out}}} - Actual query result for the test.  This result is compared to the expected result as part of the test.
  
  === Adding new unit tests ===
+ First, write a new myname.q in ql/src/test/queries/clientpositive
+ 
+ Then, run the test with the query and overwrite the result (useful when you add a new test)
+ {{{
+ ant test -Dtestcase=TestCliDriver -Dqfile=myname.q -Doverwrite=true
+ }}}
+ 
+ Then we can create a patch by:
+ {{{
+ svn add ql/src/test/queries/clientpositive/myname.q ql/src/test/results/clientpositive/myname.q.out
+ svn diff > patch.txt
+ }}}
+ 
  
  == Pluggable interfaces ==
  === SerDe - how to add a new SerDe ===