diff --git a/db/src/db.rs b/db/src/db.rs
index ccdfc7d9..8b7fb887 100644
--- a/db/src/db.rs
+++ b/db/src/db.rs
@@ -69,12 +69,12 @@ pub fn new_connection<T>(uri: T) -> rusqlite::Result<rusqlite::Connection> where
         _ => rusqlite::Connection::open(uri)?,
     };
 
-    /// See https://github.com/mozilla/mentat/issues/505 for details on temp_store
-    /// pragma and how it might interact together with consumers such as Firefox.
-    /// temp_store=2 is currently present to force SQLite to store temp files in memory.
-    /// Some of the platforms we support do not have a tmp partition (e.g. Android)
-    /// necessary to store temp files on disk. Ideally, consumers should be able to
-    /// override this behaviour (see issue 505).
+    // See https://github.com/mozilla/mentat/issues/505 for details on temp_store
+    // pragma and how it might interact together with consumers such as Firefox.
+    // temp_store=2 is currently present to force SQLite to store temp files in memory.
+    // Some of the platforms we support do not have a tmp partition (e.g. Android)
+    // necessary to store temp files on disk. Ideally, consumers should be able to
+    // override this behaviour (see issue 505).
     conn.execute_batch("
         PRAGMA page_size=32768;
         PRAGMA journal_mode=wal;
diff --git a/query-projector/src/lib.rs b/query-projector/src/lib.rs
index fd59c5c2..37b0e1b7 100644
--- a/query-projector/src/lib.rs
+++ b/query-projector/src/lib.rs
@@ -374,7 +374,8 @@ impl TupleProjector {
 
     // This is exactly the same as for rel.
     fn collect_bindings<'a, 'stmt>(&self, row: Row<'a, 'stmt>) -> Result<Vec<TypedValue>> {
-        assert_eq!(row.column_count(), self.len as i32);
+        // There will be at least as many SQL columns as Datalog columns.
+        assert!(row.column_count() >= self.len as i32);
         self.templates
             .iter()
             .map(|ti| ti.lookup(&row))
@@ -422,7 +423,8 @@ impl RelProjector {
     }
 
     fn collect_bindings<'a, 'stmt>(&self, row: Row<'a, 'stmt>) -> Result<Vec<TypedValue>> {
-        assert_eq!(row.column_count(), self.len as i32);
+        // There will be at least as many SQL columns as Datalog columns.
+        assert!(row.column_count() >= self.len as i32);
         self.templates
             .iter()
             .map(|ti| ti.lookup(&row))