RajashekharChoukimath opened a new pull request #35: Prepared Query should come 
from DB after 10 minutes.
URL: https://github.com/apache/lens/pull/35
 
 
   1) JDBCDriver.java: Changes in JDBCDriver.java was supposed to happen in 
https://github.com/apache/lens/pull/34, I had even mentioned in the comment 
section of that PR(see item 2). Some how I forgot to checkin this line.
   2) PreparedQueryContext.java: This is due to the fact, we were storing 
PreparedQueries for one week, it was bloating the memory, I decreased this to 
10 minutes, beyond 10 minutes, it will come from DB.
   3) LensServerDAO.java -- Beyond 10 minutes, I am pulling from DB.
   4) QueryExecutionServiceImpl.java  -- If prepraedQuery is not present in 
memory then I am pulling from the DB.
   5) TestLensDAO.java -- Unit test case for pulling the data from DB.

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