[Hadoop Wiki] Update of "Hive/Roadmap" by Ning Zhang

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The "Hive/Roadmap" page has been changed by Ning Zhang.
http://wiki.apache.org/hadoop/Hive/Roadmap?action=diff&rev1=16&rev2=17

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  == Features actively being worked on ==
    * ODBC driver
+   * semijoin
  
  == Short-term Features ==
    * Support for various statistical functions like Median, Standard Deviation, Variance etc.
@@ -16, +17 @@

    * Integration with dumbo or map_reduce.py so that python code can be easily embedded in Hive
  
  == More long term Features(yet to be prioritized) ==
-   * Support for Create Table as Select
+   * Support for Create Table as Select (is available on trunk and versions later than 0.4.0)
    * Support for Inserts without listing the partitioning columns explicitly - the query should be able to derive that
    * Support for Indexes
    * UNIQUE JOINS - that support a different semantics than the outer joins
@@ -32, +33 @@

  == Others ==
    * Support for Column Alias
    * Support for Statistics. - These stats are needed to make optimization decisions
-   * Join Optimizations. - Semi join, FRJ techniques etc to do the join faster
+   * Join Optimizations. - FRJ techniques etc to do the join faster
    * Transformations in LOAD. - LOAD currently does not transform the input data if it is not in the format expected by the destination table.
    * Help on CLI.  - add help to the CLI
    * Explode and Collect Operators. - Explode and collect operators to convert collections to individual items and vice versa.