Github user mhthanh commented on a diff in the pull request:
https://github.com/apache/tajo/pull/156#discussion_r18077714
--- Diff: tajo-docs/src/main/sphinx/tsql/variables.rst ---
@@ -0,0 +1,66 @@
+*********************************
+Session Variables
+*********************************
+
+
+Each client connection to TajoMaster creates a unique session, and the
client and TajoMaster uses the session until disconnect. A session provides
session variables which are used for various configs per session.
+
+``tsql`` provides the meta command ``\set`` to manipulate session
variables. Just ``\set`` command shows all session variables. ::
+
+ default> \set
+ 'name1'='val1'
+ 'name2'='val2'
+ 'name3'='val3'
+ ...
+
+``\set key val`` will set the session variable named *key* with the value
*val*. ::
+
+ default> \set
+ 'CURRENT_DATABASE'='default'
+
+ default> \set key1 val1
+
+ default> \set
+ 'CURRENT_DATABASE'='default'
+ 'key1'='val1'
+
+
+Also, ``\unset key`` will unset the session variable named *key*.
+
+
+Now, tajo provides the following session variables.
--- End diff --
I think that we should use "Tajo" consistently everywhere instead of a mix
of "tajo" and "Tajo".
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