#26833: alter_field() fails to drop indexes on columns with mixed case on Oracle
----------------------------+--------------------
Reporter: jdufresne | Owner: nobody
Type: Bug | Status: new
Component: Migrations | Version: master
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
----------------------------+--------------------
On fields that set `db_column` with mixed case, `alter_field()` fails to
drop indexes on Oracle.
Due to Oracle's `uppercases_column_names` feature,
[https://github.com/django/django/blob/8db889eaf7dce0cb715b075be32047c1b1b316da/django/db/backends/oracle/introspection.py#L158
get_constraints() returns all columns as lower case]. However,
`alter_field()` use of
[https://github.com/django/django/blob/8db889eaf7dce0cb715b075be32047c1b1b316da/django/db/backends/base/schema.py#L938-L961
_constraint_names()] compares the column name as set by `db_column`. This
must be accounted for on Oracle for the index to be properly dropped.
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Ticket URL: <https://code.djangoproject.com/ticket/26833>
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