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Functions
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Tajo provides extensive supports for functions. It includes a lot of built-in functions and user-defined functions which is implemented in Python.

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Built-in Scalar Functions
=========================

.. toctree::
    :maxdepth: 1

    functions/data_type_func_and_operators
    functions/math_func_and_operators
    functions/string_func_and_operators
    functions/datetime_func_and_operators
    functions/network_func_and_operators
    functions/json_func

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Built-in Aggregation Functions
==============================

.. toctree::
    :maxdepth: 1

    functions/agg_func

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Built-in Window Functions
=========================

.. toctree::
    :maxdepth: 1

    functions/window_func

======================
User-defined Functions
======================

.. toctree::
    :maxdepth: 1

    functions/python
    functions/hivefunc