h2. RelationalOperators

  * foreach

  * cogroup
  * group
  * join

  * cross
  
  * distinct
  * filter
  * limit
  * order
  * split
  * union

  * load
  * store
  
h2. Streaming Operator
  * stream

h2. UDF Statements
  * define
  * register

h2. Diagnostic Statements
  * describe
  * dump
  * explain
  * illustrate

h2. Built-in Functions
  * EvalFunctions
  * AVG
  * CONCAT
  * COUNT
  * DIFF
  * MIN
  * MAX
  * SIZE
  * SUM
  * TOKENIZE
  * Load/StoreFunctions
  * BinaryDeserializer
  * BinarySerializer
  * BinStorage
  * PigStorage
  * PigDump
  * TextLoader

h1. Operators
  * ArithmeticOperators
    - addition+
    - subtraction-
    - multiplication*
    - division/
    - modulo%
    - bincond?
  * ComparisonOperators
    - Equal==
    - notequal!=
    - lessthan<
    - greaterthan>
    - lessthanorequalto<=
    - greaterthanorequalto>=
    - patternmatchingmatches
  * NullOperators
    - isnull
    - isnotnull
  * BooleanOperators
    - and
    - or
    - not
  * DereferenceOperators
    - tupledereference.
    - mapdereference#
  * SignOperators
    - positive+
    - negative-
  * CastOperators
    - (type)$0
    - (type)alias
    - Nulls
    - Constants
    - Expressions
    - Schemas
    - Keywords

h1. DataTypes 
  h2. SimpleDataTypes
    - int
    - long
    - double
    - arrays
    - chararray
    - bytearray
  h2. ComplexDataTypes
    - tuple
    - bag
    - map

h1. FileCommands
  * cat
  * cd
  * copyFromLocal
  * copyToLocal
  * cp
  * ls
  * mkdir
  * mv
  * pwd
  * rm
  * rmf

h1. UtilityCommands
  * help
  * kill
  * quit
  * set