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delete() does nothing when its restriction contains a percent sign

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@dimitri-yatsenko y travaille déjà.

Depuis le 17/10/2026.

  • #1611 par @dimitri-yatsenko — ouverte

Évaluation

Difficulté
3/5
Temps estimé
1-2 jours
Accessibilité débutants
78/100
Type d'issue
Bug
Clarté
Clairement spécifiée
Activité
Active
Stack technique
mysql, postgresql, python
Domaine
database

Piste de recherche

Start with the cascade implementation around Diagram.cascade() and the restriction handling in restrict(), then trace how conditions are reapplied to the fresh table. Reproduce the % cases with the issue’s Label and Use example. Done means the cascade deletes the matching row and its descendants without changing behavior for ordinary conditions or LIKE patterns, with regression tests covering both database drivers.

Rédigé par le modèle d'indexation à partir du texte de l'issue.

Description

bug

Summary

A delete restricted by a condition that contains % deletes nothing. (Label & "name = '50%'").delete() returns 0 and leaves the row and its descendants in place, and so does a dict restriction such as {"name": "50%"}. dj.Diagram.cascade(seed).counts() reports 0 rows for every table, although len(seed) is 1.

A restriction's conditions are stored as compiled SQL, with every % already escaped as %% for the database driver. The cascade applies the seed's conditions again to a fresh copy of the table through restrict(), which escapes every % a second time. The condition then looks for the literal text 50%% and matches no row.

A LIKE pattern keeps working, because %% and % match the same strings there.

Nothing is deleted that should not be, but the delete silently does nothing.

Reproduction

DataJoint 2.3.4 and master, MySQL 8.0 and PostgreSQL 15:

import datajoint as dj

schema = dj.Schema("scratch_percent")


@schema
class Label(dj.Manual):
    definition = """
    label_id : int32
    ---
    name : varchar(16)
    """


@schema
class Use(dj.Manual):
    definition = """
    -> Label
    use_id : int32
    """


Label.insert([(1, "50%"), (2, "other")])
Use.insert([(1, 1), (2, 1)])

seed = Label & "name = '50%'"
print(len(seed))                               # 1
print(dj.Diagram.cascade(seed).counts())       # 0 rows in each table
print(seed.delete(prompt=False))               # 0; both labels and both uses remain

Workaround

Restrict by the primary keys: (Label & seed.keys()).delete().

Expected behavior

The cascade selects the same rows as the restriction on its own: label 1 and its use.

Langage dominant
Python
Étoiles
197
Forks
101
Merge moyen
3 j 8 h
PR mergées (30 j)
28

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