Tuple, Fields & Data type coercion...

1. Tuple #31
1. cascading.tuple.Tuple
2. Data is represented as Tuple in Cascading
3. Elements in a Tuple is represented by Fields #32
4. ----- Methods
5. size(): Tuple
1. Used to create a Tuple of given size #31
6. getObject(): Object
1. Returns the element at a given position #32
2. ----- Related
3. getBoolean(), getString(), getFloat(), getDouble(), getInteger()
2. Fields #32
1. cascading.tuple.Fields
2. Provides storage for field metadata : names, types, comparators & type coercion
3. ----- Example
4. Fields people = new Fields("first_name", "last_name")
5. ----- Useful Field sets
1. Fields.ALL #34
1. A wild card that represents all the current available fields
2. Fields.UNKNOWN
3. Fields.ARGS
4. .... 
6. Can be used as both 'declarators' and 'selectors' #34
3. Data typing & coercion
1. For implicit conversion of one type to another 
2. ----- Example
1.  pipe = new Coerce(new Fields("timestamp"), Long.class) 
2.  Fields simple = new Fields ("age", Long.class); 
3. ----- Methods
1. TupleEntry.getString()
4.