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docs: Update presto.default-namespace description #26625

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14 changes: 13 additions & 1 deletion presto-docs/src/main/sphinx/presto_cpp/properties.rst
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Expand Up @@ -116,7 +116,19 @@ alphabetical order.
* **Type:** ``string``
* **Default value:** ``presto.default``

Specifies the namespace prefix for native C++ functions.
Specifies the namespace prefix for native C++ functions. This prefix is used when
registering Velox functions in Prestissimo to ensure proper function resolution in
multi-catalog environments.

.. warning::

**Critical**: When registering Velox functions, you **must** follow the
``catalog.schema.`` prefix pattern. Functions registered without this pattern
will cause worker node crashes.

The configured value (for example, ``presto.default``) is automatically appended with a
trailing dot (``.``) to form the complete prefix (``presto.default.``). This results
in fully qualified function names like ``presto.default.substr`` or ``presto.default.sum``. Note, internal functions (prefixed with ``$internal$``) do not follow this pattern and are exempt from the three-part naming requirement.
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@steveburnett steveburnett Nov 21, 2025

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in fully qualified function names like ``presto.default.substr`` or ``presto.default.sum``. Note, internal functions (prefixed with ``$internal$``) do not follow this pattern and are exempt from the three-part naming requirement.
in fully qualified function names like ``presto.default.substr`` or ``presto.default.sum``. Internal functions (prefixed with ``$internal$``) do not follow this pattern and are exempt from the three-part naming requirement.


Worker Properties
-----------------
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