Fix crash on ``Super.getattr`` for previously uninferable attributes (#1370)

Co-authored-by: Pierre Sassoulas <pierre.sassoulas@gmail.com>

3 files changed, 151 insertions, 0 deletions

diff --git a/tests/testdata/python3/data/max_inferable_limit_for_classes/main.py b/tests/testdata/python3/data/max_inferable_limit_for_classes/main.py
new file mode 100644
index 00000000..2588d916
--- /dev/null
+++ b/tests/testdata/python3/data/max_inferable_limit_for_classes/main.py
@@ -0,0 +1,38 @@
+"""This example is based on sqlalchemy.
+
+See https://github.com/PyCQA/pylint/issues/5679
+"""
+from other_funcs import FromClause
+
+from .nodes import roles
+
+
+class HasMemoized(object):
+    ...
+
+
+class Generative(HasMemoized):
+    ...
+
+
+class ColumnElement(
+    roles.ColumnArgumentOrKeyRole,
+    roles.BinaryElementRole,
+    roles.OrderByRole,
+    roles.ColumnsClauseRole,
+    roles.LimitOffsetRole,
+    roles.DMLColumnRole,
+    roles.DDLConstraintColumnRole,
+    roles.StatementRole,
+    Generative,
+):
+    ...
+
+
+class FunctionElement(ColumnElement, FromClause):
+    ...
+
+
+class months_between(FunctionElement):
+    def __init__(self):
+        super().__init__()
diff --git a/tests/testdata/python3/data/max_inferable_limit_for_classes/nodes/roles.py b/tests/testdata/python3/data/max_inferable_limit_for_classes/nodes/roles.py
new file mode 100644
index 00000000..2f58f1b5
--- /dev/null
+++ b/tests/testdata/python3/data/max_inferable_limit_for_classes/nodes/roles.py
@@ -0,0 +1,82 @@
+class SQLRole(object):
+    ...
+
+
+class UsesInspection(object):
+    ...
+
+
+class AllowsLambdaRole(object):
+    ...
+
+
+class ColumnArgumentRole(SQLRole):
+    ...
+
+
+class ColumnArgumentOrKeyRole(ColumnArgumentRole):
+    ...
+
+
+class ColumnListRole(SQLRole):
+    ...
+
+
+class ColumnsClauseRole(AllowsLambdaRole, UsesInspection, ColumnListRole):
+    ...
+
+
+class LimitOffsetRole(SQLRole):
+    ...
+
+
+class ByOfRole(ColumnListRole):
+    ...
+
+
+class OrderByRole(AllowsLambdaRole, ByOfRole):
+    ...
+
+
+class StructuralRole(SQLRole):
+    ...
+
+
+class ExpressionElementRole(SQLRole):
+    ...
+
+
+class BinaryElementRole(ExpressionElementRole):
+    ...
+
+
+class JoinTargetRole(AllowsLambdaRole, UsesInspection, StructuralRole):
+    ...
+
+
+class FromClauseRole(ColumnsClauseRole, JoinTargetRole):
+    ...
+
+
+class StrictFromClauseRole(FromClauseRole):
+    ...
+
+
+class AnonymizedFromClauseRole(StrictFromClauseRole):
+    ...
+
+
+class ReturnsRowsRole(SQLRole):
+    ...
+
+
+class StatementRole(SQLRole):
+    ...
+
+
+class DMLColumnRole(SQLRole):
+    ...
+
+
+class DDLConstraintColumnRole(SQLRole):
+    ...
diff --git a/tests/testdata/python3/data/max_inferable_limit_for_classes/other_funcs.py b/tests/testdata/python3/data/max_inferable_limit_for_classes/other_funcs.py
new file mode 100644
index 00000000..f737fbf5
--- /dev/null
+++ b/tests/testdata/python3/data/max_inferable_limit_for_classes/other_funcs.py
@@ -0,0 +1,31 @@
+from operator import attrgetter
+
+from .nodes import roles
+
+
+class HasCacheKey(object):
+    ...
+
+
+class HasMemoized(object):
+    ...
+
+
+class MemoizedHasCacheKey(HasCacheKey, HasMemoized):
+    ...
+
+
+class ClauseElement(MemoizedHasCacheKey):
+    ...
+
+
+class ReturnsRows(roles.ReturnsRowsRole, ClauseElement):
+    ...
+
+
+class Selectable(ReturnsRows):
+    ...
+
+
+class FromClause(roles.AnonymizedFromClauseRole, Selectable):
+    c = property(attrgetter("columns"))