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2 changes: 0 additions & 2 deletions docs/user/dql/functions.rst
Original file line number Diff line number Diff line change
Expand Up @@ -15,8 +15,6 @@ There is support for a wide variety of functions shared by SQL/PPL. We are inten

Most of the specifications can be self explained just as a regular function with data type as argument. The only notation that needs elaboration is generic type ``T`` which binds to an actual type and can be used as return type. For example, ``ABS(NUMBER T) -> T`` means function ``ABS`` accepts an numerical argument of type ``T`` which could be any sub-type of ``NUMBER`` type and returns the actual type of ``T`` as return type. The actual type binds to generic type at runtime dynamically.

The bucket functions ``date_histogram`` and ``histogram`` are not listed here because they are only valid as a grouping key, please see also: `Aggregations <aggregations.rst>`_


Type Conversion
===============
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