Fixing typo

It seems that this function is never executed.
cleanup in sql2mapred.py script
Removing unnecessary import
First attempt for translating to Spark code

See #5: http://github.com/meisam/YSmart/issues/issue/5
A simple test case for TPCH dataset
Fixing typo

See #5: http://github.com/meisam/YSmart/issues/issue/5
Adding a script for visualizing the parse tree of SQL queries

OPEN - task 5: Translate Queries to Spark 
See #5: http://github.com/meisam/YSmart/issues/issue/5
fixing typo

"\" --> "|"
Removing hard coded paths from testystree.py

This commit removes fids the location of Spark installation dynamically.
It also infers the job name from the query file name.

See #5: http://github.com/meisam/YSmart/issues/issue/5
Translating simple table scans and join

OPEN - task 5: Translate Queries to Spark
See #5: http://github.com/meisam/YSmart/issues/issue/5
Adding one more test case to spark translate

testysmartospark.py is not actually a test suit. It contains script and
utility methods for converting SQL queries to graphs and other visual
forms that are easier to look at and reason about.
Adding one more testcase for joins

OPEN - task 5: Translate Queries to Spark
See #5: http://github.com/meisam/YSmart/issues/issue/5
Code cleanup
Adding the job name to the generated Spark/Scala code
YSmart now translates arbitrary complex expressions in the select list
into Spark/Scala

OPEN - task 5: Translate Queries to Spark
See #5: http://github.com/meisam/YSmart/issues/issue/5
Making sure that the join condition is selected correctly.

OPEN - task 5: Translate Queries to Spark
See #5: http://github.com/meisam/YSmart/issues/issue/5
Stub for translating group by expressions

OPEN - task 5: Translate Queries to Spark
See #5: http://github.com/meisam/YSmart/issues/issue/5
Removing unnecessary local variable
Converting SQL integer and decimal types to Scala Int and Float
OPEN - task 5: Translate Queries to Spark
See #5: http://github.com/meisam/YSmart/issues/issue/5
Cosmetics and code formatting