Skip to content

[docs] document Prestissimo reduce_agg behavior #21981

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
tdcmeehan merged 1 commit into from
Feb 22, 2024
Merged

[docs] document Prestissimo reduce_agg behavior #21981

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
1 change: 1 addition & 0 deletions presto-docs/src/main/sphinx/prestissimo.rst
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -21,3 +21,4 @@ Prestissimo's codebase is located at `presto-native-execution
:maxdepth: 1

prestissimo/prestissimo-features
prestissimo/prestissimo-limitations
19 changes: 19 additions & 0 deletions presto-docs/src/main/sphinx/prestissimo/prestissimo-limitations.rst
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,19 @@
=======================
Prestissimo Limitations
=======================

.. contents::
:local:
:backlinks: none
:depth: 1

Functions
=========

reduce_agg
----------

In Prestissimo, ``reduce_agg`` is not permitted to return ``null`` in either the
``inputFunction`` or the ``combineFunction``. In Presto Java, this is permitted
but undefined behavior. For more information about ``reduce_agg`` in Presto,
see `reduce_agg <../functions/aggregate.html#reduce_agg>`_.