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#29850 closed New feature (fixed)

Add window support for RowRange frames

Reported by:	Daniel Fuchs	Owned by:	Sarah Boyce
Component:	Database layer (models, ORM)	Version:	dev
Severity:	Normal	Keywords:	GSoC
Cc:	Raphael Michel, Mads Jensen, John Speno	Triage Stage:	Ready for checkin
Has patch:	yes	Needs documentation:	no
Needs tests:	no	Patch needs improvement:	no
Easy pickings:	no	UI/UX:	no

Description (last modified by Mariusz Felisiak)

The current RowRange frame is missing handling for several cases.

None of the following are currently supported:
RowRange(start=-2, end=-1)
ROWS BETWEEN 2 PRECEDING AND 1 PRECEDING
RowRange(start=1, end=2)
ROWS BETWEEN 1 FOLLOWING AND 2 FOLLOWING

It's also missing support for EXCLUDE.
ROWS BETWEEN 1 PRECEDING AND 1 FOLLOWING EXCLUDE CURRENT ROW

Frame exclusion is supported in PostgreSQL 11+, SQLite 3.28+, and Oracle 21c+ other databases do not support exclusion (MariaDB doc, and MySQL doc).

Change History (18)

comment:1 by Tim Graham, 6 years ago

Summary:	Poor Window Support for RowRange Frames → Add window support for RowRange frames
Triage Stage:	Unreviewed → Accepted
Type:	Uncategorized → New feature

comment:3 by Mariusz Felisiak, 6 years ago

Description:	modified (diff)
Version:	2.1 → master

comment:5 by Mariusz Felisiak, 5 years ago

Description:	modified (diff)

Exclusion is supported also on SQLite 3.28+ (see release notes).

comment:6 by Mariusz Felisiak, 4 years ago

Keywords:	GSoC added

comment:7 by Manav Agarwal, 4 years ago

Is it a good idea to add an argument named as exclude in WindowFrame class in django.db.models.expressions? This argument will contain the F() value of the row/range to be excluded.

comment:8 by Mariusz Felisiak, 3 years ago

Cc:	Raphael Michel Mads Jensen added

comment:9 by John Speno, 2 years ago

Cc:	John Speno added

comment:10 by Mariusz Felisiak, 2 years ago

Description:	modified (diff)

comment:11 by Sarah Boyce, 16 months ago

Owner:	changed from nobody to Sarah Boyce
Status:	new → assigned

comment:12 by Sarah Boyce, 16 months ago

Has patch:	set

comment:13 by Sarah Boyce, 16 months ago

Patch needs improvement:	set

Frame exclusions can be one of:

EXCLUDE CURRENT ROW
EXCLUDE GROUP
EXCLUDE TIES
EXCLUDE NO OTHERS

Marking that patch needs improvement as will aim to provide support for all types

comment:14 by Sarah Boyce, 16 months ago

Patch needs improvement:	unset

comment:15 by Mariusz Felisiak <felisiak.mariusz@…>, 16 months ago

In 6375cee:

Refs #29850 -- Added RowRange support for positive integer start and negative integer end.

comment:16 by Mariusz Felisiak, 16 months ago

Triage Stage:	Accepted → Ready for checkin

comment:17 by Mariusz Felisiak <felisiak.mariusz@…>, 16 months ago

In e4d012c:

Refs #29850 -- Added exclusion support to window frames.

comment:18 by Mariusz Felisiak, 16 months ago

Resolution:	→ fixed
Status:	assigned → closed

comment:19 by Sarah Boyce <42296566+sarahboyce@…>, 2 months ago

In 94436de:

Refs #29850 -- Removed obsolete test_window_frame_raise_not_supported_error.

This NotSupportedError was removed in 6375cee490725969b4f67b3c988ef01350c1ad6d
because it will never be reached due to the same exception raised by
Window.as_sql().

comment:20 by Sarah Boyce <42296566+sarahboyce@…>, 2 months ago

In 6f42b67:

[5.1.x] Refs #29850 -- Removed obsolete test_window_frame_raise_not_supported_error.