diff options
Diffstat (limited to 'django/db/backends/postgresql/operations.py')
| -rw-r--r-- | django/db/backends/postgresql/operations.py | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/django/db/backends/postgresql/operations.py b/django/db/backends/postgresql/operations.py index 235210939f..9f221b3822 100644 --- a/django/db/backends/postgresql/operations.py +++ b/django/db/backends/postgresql/operations.py @@ -144,3 +144,14 @@ class DatabaseOperations(BaseDatabaseOperations): def prep_for_iexact_query(self, x): return x + + def check_aggregate_support(self, aggregate): + """Check that the backend fully supports the provided aggregate. + + The implementation of population statistics (STDDEV_POP and VAR_POP) + under Postgres 8.2 - 8.2.4 is known to be faulty. Raise + NotImplementedError if this is the database in use. + """ + if aggregate.sql_function == 'STDDEV_POP' or aggregate.sql_function == 'VAR_POP': + if self.postgres_version[0] == 8 and self.postgres_version[1] == 2 and self.postgres_version[1] <= 4: + raise NotImplementedError('PostgreSQL 8.2 to 8.2.4 is known to have a faulty implementation of %s. Please upgrade your version of PostgreSQL.' % aggregate.sql_function) |