Switch SQLite ANN connections when load() is given a new path

src/python/txtai/ann/dense/sqlite.py

@@ -35,6 +35,8 @@ class SQLite(ANN):
         self.quantize = 8 if isinstance(self.quantize, bool) and self.quantize else int(self.quantize) if self.quantize else None
 
     def load(self, path):
+        if self.path != path:
+            self.close()
         self.path = path
 
     def index(self, embeddings):

test/python/testann/testdense/testsqlite.py

@@ -140,6 +140,8 @@ class TestSQLite(DenseTest):
 
             # Load new copy and check that it has all the changes
             model = ANNFactory.create(model.config)
+            model.load(index)
+            self.assertEqual(model.count(), 500)
             model.load(new)
             self.assertEqual(model.count(), 509)
             self.assertEqual(len(model.search(np.random.rand(1, 240).astype(np.float32), 10)[0]), 10)