#19441: No Postgres _like index when unique=True
-------------------------------------+-------------------------------------
Reporter: dylan@… | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version:
(models, ORM) | 1.5-beta-1
Severity: Normal | Resolution:
Keywords: | Triage Stage:
Has patch: 0 | Unreviewed
Needs tests: 0 | Needs documentation: 0
Easy pickings: 0 | Patch needs improvement: 0
| UI/UX: 0
-------------------------------------+-------------------------------------
Changes (by claudep):
* needs_better_patch: => 0
* needs_tests: => 0
* needs_docs: => 0
Old description:
> class Species(models.Model):
> scientific_name = models.CharField(max_length=200, db_index=True)
>
> Genererates 2 indexes
>
> BEGIN;
> CREATE INDEX "species_species_scientific_name" ON "species_species"
> ("scientific_name");
> CREATE INDEX "species_species_scientific_name_like" ON "species_species"
> ("scientific_name" varchar_pattern_ops);
>
> COMMIT;
>
> class Species(models.Model):
> scientific_name = models.CharField(max_length=200, unique=True,
> db_index=True)
>
> Does not create any indexes, because it depends on UNIQUE, but it SHOULD
> generate the index
>
> CREATE INDEX "species_species_scientific_name_like" ON "species_species"
> ("scientific_name" varchar_pattern_ops);
>
> to make sure Postgres is optimized for LIKE operator.
New description:
{{{
class Species(models.Model):
scientific_name = models.CharField(max_length=200, db_index=True)
}}}
Generates 2 indexes:
{{{
BEGIN;
CREATE INDEX "species_species_scientific_name" ON "species_species"
("scientific_name");
CREATE INDEX "species_species_scientific_name_like" ON "species_species"
("scientific_name" varchar_pattern_ops);
COMMIT;
}}}
{{{
class Species(models.Model):
scientific_name = models.CharField(max_length=200, unique=True,
db_index=True)
}}}
...does not create any indexes, because it depends on UNIQUE, but it
SHOULD generate the index:
{{{CREATE INDEX "species_species_scientific_name_like" ON
"species_species" ("scientific_name" varchar_pattern_ops);}}}
to make sure Postgres is optimized for LIKE operator.
--
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Ticket URL: <https://code.djangoproject.com/ticket/19441#comment:1>
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