[SPARK-6806] [SPARKR] [DOCS] Add a new SparkR programming guide

This PR adds a new SparkR programming guide at the top-level. This will be useful for R users as our APIs don't directly match the Scala/Python APIs and as we need to explain SparkR without using RDDs as examples etc.

cc rxin davies pwendell

cc cafreeman -- Would be great if you could also take a look at this !

Author: Shivaram Venkataraman <shivaram@cs.berkeley.edu>

Closes #6490 from shivaram/sparkr-guide and squashes the following commits:

d5ff360 [Shivaram Venkataraman] Add a section on HiveContext, HQL queries
408dce5 [Shivaram Venkataraman] Fix link
dbb86e3 [Shivaram Venkataraman] Fix minor typo
9aff5e0 [Shivaram Venkataraman] Address comments, use dplyr-like syntax in example
d09703c [Shivaram Venkataraman] Fix default argument in read.df
ea816a1 [Shivaram Venkataraman] Add a new SparkR programming guide Also update write.df, read.df to handle defaults better

1 files changed, 2 insertions, 2 deletions

diff --git a/docs/sql-programming-guide.md b/docs/sql-programming-guide.md
index ab646f65bb..7cc0a87fd5 100644
--- a/docs/sql-programming-guide.md
+++ b/docs/sql-programming-guide.md
@@ -1526,8 +1526,8 @@ adds support for finding tables in the MetaStore and writing queries using HiveQ
 # sc is an existing SparkContext.
 sqlContext <- sparkRHive.init(sc)
 
-hql(sqlContext, "CREATE TABLE IF NOT EXISTS src (key INT, value STRING)")
-hql(sqlContext, "LOAD DATA LOCAL INPATH 'examples/src/main/resources/kv1.txt' INTO TABLE src")
+sql(sqlContext, "CREATE TABLE IF NOT EXISTS src (key INT, value STRING)")
+sql(sqlContext, "LOAD DATA LOCAL INPATH 'examples/src/main/resources/kv1.txt' INTO TABLE src")
 
 # Queries can be expressed in HiveQL.
 results = sqlContext.sql("FROM src SELECT key, value").collect()