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Fixed #35444 -- Added generic support for Aggregate.order_by.

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This moves the behaviors of `order_by` used in Postgres aggregates into
the `Aggregate` class. This allows for creating aggregate functions that
support this behavior across all database engines. This is shown by
moving the `StringAgg` class into the shared `aggregates` module and
adding support for all databases. The Postgres `StringAgg` class is now
a thin wrapper on the new shared `StringAgg` class.

Thank you Simon Charette for the review.
This commit is contained in:
Chris Muthig
2024-12-22 16:30:55 +01:00
committed by Sarah Boyce
parent 6d1cf5375f
commit 4b977a5d72
19 changed files with 659 additions and 291 deletions
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docs/ref/contrib/postgres/aggregates.txt
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@@ -194,6 +194,8 @@ General-purpose aggregation functions
.. class:: StringAgg(expression, delimiter, distinct=False, filter=None, default=None, order_by=())
.. deprecated:: 6.0
Returns the input values concatenated into a string, separated by
the ``delimiter`` string, or ``default`` if there are no values.