Leaderboard  /  django-10880

django__django-10880

django/django · v3.0  ·  14 steps · 64,071 tokens · 91s
resolved
1.00

The task

The bug report the agent was given — plus the gold fix and hidden tests, shown here for reference. The agent saw only the problem statement.

Problem statementgithub issue
Query syntax error with condition and distinct combination
Description
	
A Count annotation containing both a Case condition and a distinct=True param produces a query error on Django 2.2 (whatever the db backend). A space is missing at least (... COUNT(DISTINCTCASE WHEN ...).
Gold patchheld back · the reference fix
diff --git a/django/db/models/aggregates.py b/django/db/models/aggregates.py--- a/django/db/models/aggregates.py+++ b/django/db/models/aggregates.py@@ -68,7 +68,7 @@ def get_group_by_cols(self): return [] def as_sql(self, compiler, connection, **extra_context):- extra_context['distinct'] = 'DISTINCT' if self.distinct else ''+ extra_context['distinct'] = 'DISTINCT ' if self.distinct else '' if self.filter: if connection.features.supports_aggregate_filter_clause: filter_sql, filter_params = self.filter.as_sql(compiler, connection)
Hidden testtest_patch · applied only to grade
diff --git a/tests/aggregation/tests.py b/tests/aggregation/tests.py--- a/tests/aggregation/tests.py+++ b/tests/aggregation/tests.py@@ -8,6 +8,7 @@ Avg, Count, DecimalField, DurationField, F, FloatField, Func, IntegerField, Max, Min, Sum, Value, )+from django.db.models.expressions import Case, When from django.test import TestCase from django.test.utils import Approximate, CaptureQueriesContext from django.utils import timezone@@ -395,6 +396,12 @@ def test_count_star(self): sql = ctx.captured_queries[0]['sql'] self.assertIn('SELECT COUNT(*) ', sql) + def test_count_distinct_expression(self):+ aggs = Book.objects.aggregate(+ distinct_ratings=Count(Case(When(pages__gt=300, then='rating')), distinct=True),+ )+ self.assertEqual(aggs['distinct_ratings'], 4)+ def test_non_grouped_annotation_not_in_group_by(self): """ An annotation not included in values() before an aggregate should be
1FAIL → PASS
55PASS → PASS
56 / 56green

The agent run

The agent's step-by-step attempt — its reasoning, the tools it called, and the patch it produced.

System promptharness.agent.build_system_prompt
You are an AI coding assistant working inside a code repository that contains a bug. Investigate the code, find the bug, and fix it.

Your working directory is: /testbed
All four tools (read_file, write_file, edit_file, run_bash) already run from that directory. Use plain relative paths; do not prefix shell commands with cd. Fix the bug by editing source files only; do not create or edit test files.
Step 01 tool use
Let me investigate this bug. The issue is about a missing space in SQL generation when using `Count` annotation with both a `Case` condition and `distinct=True`. The SQL output is something like `COUNT(DISTINCTCASE WHEN ...)` instead of `COUNT(DISTINCT CASE WHEN ...)`. Let me start by exploring the codebase to understand the structure and find the relevant code.
run_bash{ command: "find /testbed -type f -name \"*.py\" | head -50" }
tool result · run_bash
exitcode: 0 stdout: /testbed/django/shortcuts.py /testbed/django/core/files/utils.py /testbed/django/core/files/storage.py /testbed/django/core/files/images.py /testbed/django/core/files/temp.py /testbed/django/core/files/base.py /testbed/django/core/files/__init__.py /testbed/django/core/files/uploadhandler.py /testbed/django/core/files/locks.py /testbed/django/core/files/move.py /testbed/django/core/files/uploadedfile.py /testbed/django/core/signals.py /testbed/django/core/ …
Step 02 tool use
Let me find the relevant files for the aggregation/Count functionality. The issue is in Django's ORM aggregation, likely in the `django/db/models/aggregates.py` or in the SQL compiler.
run_bash{ command: "find /testbed -type f -name \"*.py\" | xargs grep -l \"DISTINCT\" 2>/dev/null" }
tool result · run_bash
exitcode: 0 stdout: /testbed/django/db/backends/base/operations.py /testbed/django/db/backends/base/features.py /testbed/django/db/backends/sqlite3/operations.py /testbed/django/db/backends/postgresql/operations.py /testbed/django/db/models/sql/compiler.py /testbed/django/db/models/aggregates.py /testbed/tests/backends/base/test_operations.py /testbed/tests/backends/sqlite/tests.py stderr:
Step 03 tool use
Let me look at the aggregates.py file first, as that's where Count is defined.
read_file{ path: "/testbed/django/db/models/aggregates.py" }
tool result · read_file
""" Classes to represent the definitions of aggregate functions. """ from django.core.exceptions import FieldError from django.db.models.expressions import Case, Func, Star, When from django.db.models.fields import IntegerField from django.db.models.functions.mixins import ( FixDurationInputMixin, NumericOutputFieldMixin, ) __all__ = [ 'Aggregate', 'Avg', 'Count', 'Max', 'Min', 'StdDev', 'Sum', 'Variance', ] class Aggregate(Func): template = '%(function)s(%(dis …
Step 04 tool use
Now I can see the issue. In the `Aggregate.as_sql` method, when there's a filter and the database doesn't support the aggregate filter clause, the code does: ```python copy = self.copy() copy.filter = None source_expressions = copy.get_source_expressions() condition = When(self.filter, then=source_expressions[0]) copy.set_source_expressions([Case(condition)] + source_expressions[1:]) return super(Aggregate, copy).as_sql(compiler, connection, **extra_context) ``` So it replaces the first source expression with a `Case(When(...))` and then calls `super().as_sql()`. The template for Aggregate is: ```python template = '%(function)s(%(distinct)s%(expressions)s)' ``` When `distinct` is True, `extra_context['distinct']` is set to `'DISTINCT'` (without a trailing space). Then the template becomes something like: `COUNT(DISTINCTCASE WHEN ...)` because there's no space between DISTINCT and the expression. The fix should be to add a space after DISTINCT. Let me look at the code more carefully: ```python extra_context['distinct'] = 'DISTINCT' if self.distinct else '' ``` This should be `'DISTINCT '` (with trailing space) instead of `'DISTINCT'`. Let me verify this is the issue by checking if there are other places where the distinct keyword is used.
Now I can see the bug. Look at line 70 in `/testbed/django/db/models/aggregates.py`: ```python extra_context['distinct'] = 'DISTINCT' if self.distinct else '' ``` When `distinct=True`, it sets the value to `'DISTINCT'` without a trailing space. The template on line 16 is: ```python template = '%(function)s(%(distinct)s%(expressions)s)' ``` So when the expression is something like `CASE WHEN ...`, it produces `COUNT(DISTINCTCASE WHEN ...)` — no space between `DISTINCT` and `CASE`. The fix is to add a trailing space to `'DISTINCT'`. Let me apply the fix:
edit_file{ path: "/testbed/django/db/models/aggregates.py", old_string: " extra_context['distinct'] = 'DISTINCT' if self.distinct else ''", new_string: " extra_context['distinct'] = 'DISTINCT ' if self.distinct else ''" }
tool result · edit_file
File /testbed/django/db/models/aggregates.py edited successfully.
Step 05 tool use
Let me verify the fix and also check if there are any tests I should run to confirm.
Now let me verify the fix by checking if there are existing tests for this scenario:
run_bash{ command: "cd /testbed && grep -r \"DISTINCT\" tests/ --include=\"*.py\" -l" }
tool result · run_bash
exitcode: 0 stdout: tests/backends/base/test_operations.py tests/backends/sqlite/tests.py stderr:
Step 06 tool use
Let me also check the aggregation test files to see if there are tests for Count with distinct and Case.
run_bash{ command: "cd /testbed && grep -r \"Count.*distinct\\|distinct.*Count\\|Count.*Case\\|Case.*Count\" tests/ --include=\"*.py\" -l" }
tool result · run_bash
exitcode: 0 stdout: tests/i18n/tests.py tests/filtered_relation/tests.py tests/many_to_one/tests.py tests/aggregation/test_filter_argument.py tests/aggregation/tests.py tests/expressions/tests.py tests/aggregation_regress/tests.py stderr:
Step 07 tool use
Let me run the relevant aggregation tests to make sure my fix doesn't break anything.
Let me run the aggregation tests to verify nothing breaks:
run_bash{ command: "cd /testbed && python -m django test aggregation --settings=tests.test_sqlite -v 2 2>&1 | tail -30" }
tool result · run_bash
exitcode: 0 stdout: aggregation (unittest.loader._FailedTest) ... ERROR ====================================================================== ERROR: aggregation (unittest.loader._FailedTest) ---------------------------------------------------------------------- ImportError: Failed to import test module: aggregation Traceback (most recent call last): File "/opt/miniconda3/envs/testbed/lib/python3.6/unittest/loader.py", line 153, in loadTestsFromName module = __import__ …
Step 08 tool use
Let me find the correct test module paths.
run_bash{ command: "cd /testbed && python -m django test aggregation.tests --settings=tests.test_sqlite -v 2 2>&1 | tail -30" }
tool result · run_bash
exitcode: 0 stdout: aggregation (unittest.loader._FailedTest) ... ERROR ====================================================================== ERROR: aggregation (unittest.loader._FailedTest) ---------------------------------------------------------------------- ImportError: Failed to import test module: aggregation Traceback (most recent call last): File "/opt/miniconda3/envs/testbed/lib/python3.6/unittest/loader.py", line 153, in loadTestsFromName module = __import__ …
Step 09 tool use
Let me check the correct settings and test structure.
run_bash{ command: "cd /testbed && python -m django test tests.aggregation --settings=tests.test_sqlite -v 2 2>&1 | tail -30" }
tool result · run_bash
exitcode: 0 stdout: Traceback (most recent call last): File "/opt/miniconda3/envs/testbed/lib/python3.6/runpy.py", line 193, in _run_module_as_main "__main__", mod_spec) File "/opt/miniconda3/envs/testbed/lib/python3.6/runpy.py", line 85, in _run_code exec(code, run_globals) File "/testbed/django/__main__.py", line 9, in <module> management.execute_from_command_line() File "/testbed/django/core/management/__init__.py", line 381, in execute_from_command_lin …
Step 10 tool use
The test running is a bit tricky. Let me try to directly run the test file for aggregations.
run_bash{ command: "cd /testbed && python tests/runtests.py aggregation --verbosity=2 2>&1 | tail -40" }
tool result · run_bash
exitcode: 0 stdout: test_combine_different_types (aggregation.tests.AggregateTestCase) ... ok test_complex_aggregations_require_kwarg (aggregation.tests.AggregateTestCase) ... ok test_complex_values_aggregation (aggregation.tests.AggregateTestCase) ... ok test_count (aggregation.tests.AggregateTestCase) ... ok test_count_star (aggregation.tests.AggregateTestCase) ... ok test_dates_with_aggregation (aggregation.tests.AggregateTestCase) ... ok test_decimal_max_digits_has_no_eff …
Step 11 tool use
Aggregation tests all pass. Let me also run the aggregation_regress tests and the expressions tests to make sure nothing is broken. Let me also verify the fix is correct by re-reading the changed line.
All 65 aggregation tests pass. Let me also run the aggregation regression tests and filter argument tests:
run_bash{ command: "cd /testbed && python tests/runtests.py aggregation_regress aggregation.test_filter_argument --verbosity=2 2>&1 | tail -20" }
tool result · run_bash
exitcode: 0 stdout: test_quoting_aggregate_order_by (aggregation_regress.tests.AggregationTests) ... ok test_reverse_join_trimming (aggregation_regress.tests.AggregationTests) ... ok test_reverse_relation_name_conflict (aggregation_regress.tests.AggregationTests) ... ok test_sliced_conditional_aggregate (aggregation_regress.tests.AggregationTests) ... ok test_stddev (aggregation_regress.tests.AggregationTests) ... ok test_ticket_11293 (aggregation_regress.tests.AggregationTes …
Step 12 tool use
All tests pass. Let me verify the final state of the file to make sure the fix is correct.
All tests pass. Let me verify the final state of the fix:
read_file{ path: "/testbed/django/db/models/aggregates.py", offset: "68", limit: "5" }
tool result · read_file
ERROR: bad arguments for 'read_file': Toolbox.read_file() got an unexpected keyword argument 'offset'
Step 13 tool use
Let me read the file with the correct parameters.
read_file{ path: "/testbed/django/db/models/aggregates.py" }
tool result · read_file
""" Classes to represent the definitions of aggregate functions. """ from django.core.exceptions import FieldError from django.db.models.expressions import Case, Func, Star, When from django.db.models.fields import IntegerField from django.db.models.functions.mixins import ( FixDurationInputMixin, NumericOutputFieldMixin, ) __all__ = [ 'Aggregate', 'Avg', 'Count', 'Max', 'Min', 'StdDev', 'Sum', 'Variance', ] class Aggregate(Func): template = '%(function)s(%(dis …
Step 14 reasoning
The fix is in place. The change on line 70 now reads: ```python extra_context['distinct'] = 'DISTINCT ' if self.distinct else '' ``` Note the trailing space after `DISTINCT`. This ensures that when the template `%(function)s(%(distinct)s%(expressions)s)` is rendered, there will be a space between `DISTINCT` and the expression, producing `COUNT(DISTINCT CASE WHEN ...)` instead of `COUNT(DISTINCTCASE WHEN ...)`. This is the complete fix. The bug was a missing space character in the `DISTINCT` string used in the `as_sql` method of the `Aggregate` class. When `distinct=True` and a `filter` is used (which triggers the `Case`/`When` wrapping for databases without native `FILTER` support), the resulting SQL would be malformed because `DISTINCT` would directly abut the `CASE` keyword.
The fix is complete. Here's a summary of the bug and the fix: **Bug:** In `/testbed/django/db/models/aggregates.py`, line 70, the `as_sql` method of `Aggregate` sets the `distinct` extra context to `'DISTINCT'` without a trailing space: ```python extra_context['distinct'] = 'DISTINCT' if self.distinct else '' ``` The template on line 16 is: ```python template = '%(function)s(%(distinct)s%(expressions)s)' ``` When a `Count` uses both `distinct=True` and a `filter` (on a database backend that doesn't support the native `FILTER` clause), the filter path wraps the expression in a `Case(When(...))`. The resulting SQL becomes: ```sql COUNT(DISTINCTCASE WHEN ...) ``` instead of the correct: ```sql COUNT(DISTINCT CASE WHEN ...) ``` **Fix:** Added a trailing space to the `'DISTINCT'` string: ```python extra_context['distinct'] = 'DISTINCT ' if self.distinct else '' ``` This ensures a space separates `DISTINCT` from whatever expression follows it.
Agent diffcaptured before grading
diff --git a/django/db/models/aggregates.py b/django/db/models/aggregates.pyindex ac0b62d0bf..ea88c54b0d 100644--- a/django/db/models/aggregates.py+++ b/django/db/models/aggregates.py@@ -68,7 +68,7 @@ class Aggregate(Func): return [] def as_sql(self, compiler, connection, **extra_context):- extra_context['distinct'] = 'DISTINCT' if self.distinct else ''+ extra_context['distinct'] = 'DISTINCT ' if self.distinct else '' if self.filter: if connection.features.supports_aggregate_filter_clause: filter_sql, filter_params = self.filter.as_sql(compiler, connection)